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Publications 1990 - 1999

2000 -

1990 1991 1992 1993 1994 1995 1996 1997 1998 1999

1980 - 1989

1977 - 1979


1999

  1. J. Fidler and T. Schrefl,
    "Micromagnetic modelling of nanocrystalline magnets and structures",
    J. Magn. Magn. Mater. 203 (1999) 28-32.
    Preprint: [ Abstract ]

  2. D. Süss, J T. Schrefl,. Fidler and J. N. Chapman
    "Micromagnetic simulation of the long range interaction between NiFe nano-elements using the BE-method",
    J. Magn. Magn. Mater. 196-197 (1999) 617-619.
    Preprint: [ Abstract ], [ HTML ], [ PDF ]

  3. H. Zwick, T. Schrefl and J. Fidler
    "PD-simulation of powder compaction for Nd-Fe-B magnets",
    J. Magn. Magn. Mater. 196-197 (1999) 305-306.
    Preprint: [ Abstract ], [ HTML ], [ PDF ]

  4. W. Scholz, T. Schrefl and J. Fidler
    "Mesh refinement in FE-micromagnetics for multi-domain Nd2Fe14B particles",
    J. Magn. Magn. Mater. 196-197 (1999) 933-934.
    Preprint: [ Abstract ], [ PDF ], [ HTML ]

  5. J. Bernardi, G.F. Soto, J. Fidler, S. David and D. Givord
    "Influence of microstructure and magnetic properties of nanocomposite RE5.5(Fe,Cr,M)76.5B18 (RE=Nd,Tb; Cr >3 at%, M=Co,Si) magnets"
    JAP 85 (1999) 5905-5907.
    © (1999) American Institute of Physics see copyright notice
    The following article appeared in JAP 85 (1999) 5905-5907 and may be found at the publisher's website
    [ Abstract ], [ PDF ]

  6. B. Streibl, T. Schrefl and J. Fidler
    "Dynamic FE-simulation of the standard #2 problem"
    JAP 85 (1999) 5819-5821.
    © (1999) American Institute of Physics see copyright notice
    The following article appeared in JAP 85 (1999) 5819-5821 and may be found at the publisher's website
    [ Abstract ], [ HTML ], [ PDF ]

  7. T. Schrefl, J. Fidler, C. Kirk and J.N. Chapman
    "Simulation of magnetization reversal in polycrystalline patterned Co-elements",
    JAP 85 (1999) 6169-6171.
    © (1999) American Institute of Physics see copyright notice
    The following article appeared in JAP 85 (1999) 6169-6171 and may be found at the publisher's website
    [ Abstract ], [ HTML ], [ PDF ]

  8. H. Zwick, T. Schrefl and J. Fidler
    "Simulation of the particle misalignment of hard magnets after compaction"
    JAP 85 (1999) 5672-5674.
    © (1999) American Institute of Physics see copyright notice
    The following article appeared in JAP 85 (1999) 5672-5674 and may be found at the publisher's website
    [ Abstract ], [ HTML ], [ PDF ]

  9. J.C.Tellez-Blanco, R.Sato Turtelli, R.Grössinger, E.Estevez-Rams and J.Fidler
    "Giant magnetic viscosity in SmCo5-xCux alloys",
    JAP 86 (1999) 5157-5163.
    © (1999) American Institute of Physics see copyright notice
    The following article appeared in JAP 86 (1999) 5157-5163 and may be found at the publisher's website
    [ Abstract ], [ PDF ]

  10. E.Estevez-Rams, J. Fidler, A. Penton, A. Valor-Reed, J.C. Tellez-Blanco, R. Sato Turtelli, R. Grössinger,
    "Microstructural study of high coercivity Sm(Co,Cu)5 alloy",
    J. Magn. Magn. Mater. 195 (1999) 595-600.
    Preprint: [ Abstract ]

  11. E.Estevez-Rams, A. Penton, S. Novo, J. Fidler, J.C. Tellez-Blanco, R. Grössinger,
    "Microstructural evolution of Sm(Co1-xCux)5 (0<x<0.5) alloys",
    J. Alloys and Compounds. 283 (1999) 289-295.
    Preprint: [Abstract ]

  12. E.Estevez-Rams, J. Fidler, A. Penton, J.C. Tellez-Blanco, R. S. Turtelli, R. Grössinger,
    "Transmission electron microscopy study of structural disorder in Sm(Co0.5Cu0.5) alloy",
    J. Alloys and Compounds. 283 (1999) 327-330.
    Preprint: [ Abstract ]

  13. J. Fidler, S. Sasaki and E. Estevez-Rams
    "High Performance Magnets - Microstructure and Coercivity",
    Materials Research Society Symposium Proceedings Vol. 577: Advanced hard and soft magnetic materials, 1999, pp. 291-203.

  14. J. Bernardi, M. Noner, J. Fidler, Xiu-Feng Han and Fu-ming Yang,
    "Microstructural investigation of RE3(Fe,V)29 (RE=Nd,Tb) magnetic materials";
    Materials Research Society Symposium Proceedings Vol. 577: Advanced hard and soft magnetic materials, 1999, pp. 315-320.

  15. Thomas Schrefl and Josef Fidler
    "Micromagnetics of nanocrystalline permanent magnets"
    Materials Research Society Symposium Proceedings Vol. 577: Advanced hard and soft magnetic materials, 1999, pp. 163-174.

  16. Thomas Schrefl, and Josef Fidler,
    "Finite element modeling of nanocomposite magnets",
    IEEE Trans Magn., 35 (1999) 3223-3228.
    [ Abstract ], [ PDF ]
    © 1999 IEEE see copyright notice

  17. T. Schrefl,
    "Finite elements in numerical micromagnetics I: Granular hard magnets",
    J. Magn Magn. Mater., 207 (1999) 45-65.
    Preprint: [ Abstract ]

  18. T. Schrefl,
    "Finite elements in numerical micromagnetics II: Patterned magnetic elements",
    J. Magn. Magn. Mater., 207 (1999) 66-77.
    Preprint: [ Abstract ]

  19. S. Sasaki,
    "Highest performance magnets",
    Doktorarbeit, Institut für Angewandte und Technische Physik, TU Wien, 1999.

  20. W. Scholz,
    "Micromagnetic simulation of thermally activated switching in fine particles",
    Diplomarbeit, Institut für Angewandte und Technische Physik, TU Wien, 1999.
    [ Abstract ] , [ HTML ] , [ PDF ]

  21. D. Suess,
    "Mikromagnetische Simulation der Keimbildung in SE-Magneten",
    Diplomarbeit, Institut für Angewandte und Technische Physik, TU Wien, 1999.
    [ Abstract ], [ PDF ] (6 MB)

1998

  1. J.L. Sanchez, G. Lopez, E.Estevez and J. Fidler,
    "Metastable and stable magnetic phases in as-cast and 600°C annealed Pr80Fe15(B1-xCx)5 alloys (0.0 ó x ó 1.0)",
    J. Alloys and Compounds, 264(1998) 252-257.
    Preprint: [ Abstract ]

  2. T. Schrefl and J. Fidler,
    "Modelling of exchange spring permanent magnets",
    J. Magn. Magn. Mater. 177-181 (1998) 970-975.
    Preprint: [ Abstract ], [ HTML ], [ PDF ]

  3. J Fidler,
    "Rare earth intermetallic magnets",
    Inst.Phys.Conf.Ser.No.152, Section G: Magnetic Materials, Paper presented at the 11th Int. Conf. on Ternary & Multinary Compounds, ICTMC-11, Salford, UK, September 1997, (1998), 805-813.

  4. T. Schrefl and J. Fidler,
    "Micromagnetic simulation of magnetizability of nanocomposite Nd-Fe-B magnets",
    J. Appl. Phys. 83 (1998) 6262-6264.
    © (1998) American Institute of Physics see copyright notice
    The following article appeared in J. Appl. Phys. 83 (1998) 6262-6264 and may be found at the publisher's website
    [ Abstract ], [ HTML ], [ PDF ]

  5. J. Bernardi, J. Fidler, M. Sagawa and Y. Hirose,
    "Microstructural analysis of strip cast Nd-Fe-B alloys for high (BH)max magnets",
    J. Appl. Phys. 83 (1998) 6396-6398.
    © (1998) American Institute of Physics see copyright notice
    The following article appeared in J. Appl. Phys. 83 (1998) 6396-6398 and may be found at the publisher's website
    [ Abstract ], [ PDF ]

  6. T. Schrefl, J. Fidler, J.N. Chapman, K.J. Kirk, and P. Thompson,
    "3D-micromagnetic simulation of domain structures observed by Lorentz electron microscopy",
    Proc. 14. Int. Congress on Electron Microscopy, Cancun, Mexico, Sept. 1998, Symp. X, Institute of Physics Publ., Bristol, Philadelphia, Vol II, p.507-508.

  7. E. Estevez-Rams, A. Valor, A. Penton, J. Fidler, J.C. Tellez and R. Grossinger,
    "Electron microscopy study of SmCo5-xCux magnetic material",
    Proc. 14. Int. Congress on Electron Microscopy, Cancun, Mexico, Sept. 1998, Symp. X, Institute of Physics Publ., Bristol, Philadelphia, Vol II, p.541-542.

  8. E. Estevez-Rams, J. Fidler, R. Grossinger and R.S. Turtelli
    "Electron microscopy study of nanocrystalline soft magnetic material",
    Proc. 14. Int. Congress on Electron Microscopy, Cancun, Mexico, Sept. 1998, Symp. DD, Institute of Physics Publ., Bristol, Philadelphia, Vol III, p.167-168.

  9. J. Fidler and T. Schrefl,
    "Micromagnetic calculation of the limits of composite Nd2Fe14B/a-Fe, Fe3B, Fe23B6 magnets",
    Proc. X. Symp. on magnetic anisotropy and coercivity in RE-TM alloys, Dresden, Sept. 1998, Werkstoff-Informationsges., Frankfurt, p. 267-276.

  10. R. W. Chantrell, J. Hannay, M. Wongsam, T. Schrefl, and H.-J. Richter,
    "Computational approaches to thermally activated fast relaxation",
    IEEE Trans. Magn. 34, 1839-1844, (1998).
    [ Abstract ], [ PDF ]
    © 1998 IEEE see copyright notice

  11. M. Noner,
    "TEM-study of Nd2Fe14B based magnetic powders",
    Diplomarbeit, Institut für Angewandte und Technische Physik, TU Wien, 1998.
    [ Abstract ] , [ PDF ]

  12. H. Schmidt,
    "3D-dynamic micromagnetic simulation of electron transparent magnetic systems",
    Diplomarbeit, Institut für Angewandte und Technische Physik, TU Wien, 1998.
    [ Abstract ] , [ PDF: Chapter 1-4 ], [ PDF: Chapter 5 ], [ PDF: Chapter 6 ], [ PDF: Appendix 1 ], [ PDF: Appendix 2 ],

  13. B. Streibl,
    "Dynamische mikromagnetische Simulation von µMAG Standardproblemen",
    Diplomarbeit, Institut für Angewandte und Technische Physik, TU Wien, 1998.
    [ Abstract ] , [ HTML ] , [ PDF ]

  14. H.Zwick,
    "Particle dynamics-simulation of  the compaction of hard magnetic powders",
    Diplomarbeit, Institut für Angewandte und Technische Physik, TU Wien, 1998.
    [ Abstract ] , [ HTML ] , [ PDF ]

1997

  1. J. Fidler,
    "Review of bulk permanent magnets",
    Magnetic hysteresis in novel magnetic materials, edited by G.C. Hadjipanayis, Kluwer Academic Publ., Boston-London, NATO ASI Series E: Applied Sciences - Vol. 338, 1997, p. 567-597.

  2. T. Schrefl, H. Roitner and J. Fidler,
    "Dynamic micromagnetics of nanocomposite Nd-Fe-B magnets",
    J.Appl.Phys., 81 (1997) 5567-5569.
    © (1997) American Institute of Physics see copyright notice
    The following article appeared in J.Appl.Phys., 81 (1997) 5567-5569 and may be found at the publisher's website
    [ Abstract ], [ PDF ]

  3. T. Schrefl, J. Fidler, K.J. Kirk and J.N. Chapman,
    "A higher order FEM-BEM method for the calculation of domain processes in magnetic nano-elements",
    IEEE Trans. Magn., 33 (1997) 4182-4184.
    [ Abstract ], [ PDF ]
    © 1997 IEEE see copyright notice

  4. J.C. Tellez-Blanco, X.C. Kou, R.Grössinger, E. Estevez, J. Fidler and B.M. Ma,
    "Coercivity and magnetic anisotropy of sintered Sm2Fe17 type permanent magnets",
    J. Appl. Phys., 82 (1997) 3928-3933.
    © (1997) American Institute of Physics see copyright notice
    The following article appeared in J. Appl. Phys., 82 (1997) 3928-3933 and may be found at the publisher's website
    [ Abstract ], [ PDF ]

  5. T. Schrefl, J. Fidler, K.J. Kirk and J.N. Chapman,
    "Domain structures and switching mechanisms in patterned magnetic elements",
    J. Magn. Magn. Mater. 175 (1997) 193-204.
    Preprint: [ Abstract ]

  6. K. M. Tako, T. Schrefl, M. A. Wongsam, and R. W. Chantrell,
    "Finite element micromagnetic simulation with adaptive mesh refinement",
    J. Appl. Phys. 81, (1997) 4082-4084.
    © (1997) American Institute of Physics see copyright notice
    The following article appeared in J. Appl. Phys. 81, (1997) 4082-4084 and may be found at the publisher's website
    [ Abstract ], [ PDF ]

  7. T. Schrefl,
    "Micromagnetics of thin films and multilayers",
    Magnetic hysteresis in novel magnetic materials, edited by G.C. Hadjipanayis, Kluwer Academic Publ., Boston-London, NATO ASI Series E: Applied Sciences - Vol. 338, 1997, p.49-68 .

  8. R. W. Chantrell, K. M. Tako, M. A. Wongsam, N. Walmsly and T. Schrefl,
    "Magnetic properties and microsctructure of thin film media",
    J. Magn. Magn. Mater. 175 (1997) 137-147.
    Preprint: [ Abstract ]

  9. M. Matzinger,
    "Microstructure and magnetic properties of HDDR RE permanent magnetic materials"
    Dissertation, Institut für Angewandte und Technische Physik, TU Wien, 1997.

  10. A. Liebminger,
    "TEM-characterisation of mechanically alloyed Ni-ODS alloys"
    Dissertation, Institut für Angewandte und Technische Physik, TU Wien, 1997.

  11. N. Fuchs,
    "Microstructure and mechanical properties of sub-microcrystalline Al2O3 prepared by Sol-Gel sintering"
    Dissertation, Institut für Angewandte und Technische Physik, TU Wien, 1997.

  12. C. Burkhardt, M. Matzinger, M. Steinhorst, J. Fidler and I.R. Harris,
    "HDDR processing of direct reduced Nd15Fe77-xB8Gax powders",
    J. Magn. Magn. Mater. 169 (1997) 69-81.
    Preprint: [ Abstract ]

1996

  1. R. Fischer, T. Schrefl, H. Kronmüller and J. Fidler,
    "Grain size dependence of remanence and coercive field of isotropic nanocrysstalline composite permanent magnets",
    J. Magn. Magn. Mater. 153 (1996) 35-49.
    Preprint: [ Abstract ]

  2. E. Estevez, J. Fidler, M. Dahlgren, R. Grössinger, M. Knobel and P. Tiberto,
    "Structural investigation of amorphous and nanocrystalline Fe86Zr7Cu1B6",
    J. Physics D, 29 (1996) 848-854.
    [ Abstract ], [ PDF ]
    Journal of Physics D: Applied Physics - © (1996) IOP Publishing Ltd. see copyright notice

  3. E. Estevez, J. Fidler, C. Short and I.R. Harris,
    "Microstructural study of hot pressed HDDR Nd-Fe-B magnets",
    J. Physics D, 29 (1996), 951-956.
    [ Abstract ], [ PDF ]
    Journal of Physics D: Applied Physics - © (1996) IOP Publishing Ltd. see copyright notice

  4. T. Schrefl and J. Fidler,
    "3D-calculation of magnetization processes in Co/Pt multilayers",
    J. Magn. Magn. Mater. 155 (1996), 389-392.
    Preprint: [ Abstract ]

  5. T. Schrefl and J. Fidler,
    "Numerical micromagnetics for granular magnetic materials",
    J. Magn. Magn. Mater. 157/158 (1996) 331-335.
    Preprint: [ Abstract ]

  6. M. Matzinger, J. Fidler, A. Fujita and I.R. Harrris,
    "Microstructure of solid-HDDR Nd-Fe-B:Zr magnets",
    J. Magn. Magn. Mater. 157/158 (1996) 54-56.
    Preprint: [ Abstract ]

  7. J. Fidler and T. Schrefl,
    "Overview of Nd-Fe-B magnets and coercivity",
    J. Appl. Phys., 79 (1996) 5029-5034.
    © (1996) American Institute of Physics see copyright notice
    The following article appeared in J. Appl. Phys., 79 (1996) 5029-5034 and may be found at the publisher's website
    [ Abstract ], [ PDF ]

  8. T. Schrefl and J. Fidler,
    "Numerical micromagnetics in hard and magnetic multilayer systems",
    J. Appl. Phys., 79 (1996) 6458-6463.
    © (1996) American Institute of Physics see copyright notice
    The following article appeared in J. Appl. Phys., 79 (1996) 6458-6463 and may be found at the publisher's website
    [ Abstract ], [ PDF ]

  9. T. Schrefl, J. Fidler and J.N. Chapman,
    "Micromagnetic modelling of multilayer media",
    J. Physics D, 29 (1996) 2352-2361.
    [ Abstract ], [ PDF ]
    Journal of Physics D: Applied Physics - © (1996) IOP Publishing Ltd. see copyright notice

  10. T. Schrefl and J. Fidler,
    "Micromagnetic simulation of MO-multilayers",
    J. Magnetics Society of Japan, 20 Suppl.S1 (1996) 223-228.

  11. J.C. Tellez-Blanco, X.C. Kou, R.Grössinger, E. Estevez-Rams, J. Fidler and Bao Min Ma,
    "Study of coercivity and magnetic anisotropy of sintered Sm2Fe17 type permanent magnets in the temperature range from 4.2 to 1000 K",
    Proc. XIV Int. Workshop on Rare Earth magnets and their applications, Sao Paulo, Brasil, ed. by F.P. Missel et al., World Scientific, (1996) Vol.1, 707-716.

  12. J. Fidler W. Winkler and J. Bernardi,
    "Microstructure of high energy density Nd-Fe-B magnets",
    Proc. XIV Int. Workshop on Rare Earth magnets and their applications, Sao Paulo, Brasil, ed. by F.P. Missel et al., World Scientific, (1996) Vol.2, 419-428.

  13. J.L. Sanchez, G. Lopez, E. Estevez and J. Fidler,
    "Magnetic and microstructural characterization of as-cast and 600 °C annealed Pr80Fe15(B1-xCx)5 alloys (0 < x < 1),
    Proc. XIV Int. Workshop on Rare Earth magnets and their applications, Sao Paulo, Brasil, ed. by F.P. Missel et al., World Scientific, (1996) Vol.2, 152-163.

  14. J.L. Sanchez, G. Lopez, E. Estevez and J. Fidler,
    "Magnetic phases in as-cast and 600 °C annealed Nd80Fe15(B1-xCx)5 alloys (0 < x < 1),
    J. Alloys and Compounds, 243 (1996) 120-125.
    Preprint: [ Abstract ]

  15. Wolfram Winkler
    "Hard magnets with highest energy density product - Preparation and characterisation"
    Diplomarbeit, Institut für Angewandte und Technische Physik, TU Wien, 1996.

  16. Ernesto Estevez-Rams,
    "TEM study of the correlation between microstructure and magnetic properties of novel hard and soft magnetic materials"
    Dissertation, Institut für Angewandte und Technische Physik, TU Wien, 1996.

1995

  1. Josef Fidler, J. Bernardi and T. Schrefl,
    "Permanent magnets-new microstructural aspects",
    Scripta Metallurgica et Materialia, Volume 33, Issue 10-11, 1 December 1995, Pages 1781-1791.
    Preprint: [ Abstract ]

  2. O. Gutfleisch, I. R. Harris, M. Matzinger and J. Fidler,
    "Characterisation of solid-HDDR processed Nd16Fe76B8 alloys by means of electron microscopy",
    Journal of Magnetism and Magnetic Materials, Volume 147, Issue 3, June 1995, Pages 320-330.
    Preprint: [ Abstract ]

  3. M. Seeger, J. Bauer, G. Rieger, H. Kronmüller, J. Bernardi and J. Fidler,
    "Magnetic and microstructural properties of FeNdB type magnets with additives",
    Journal of Magnetism and Magnetic Materials, Volumes 140-144, Part 2, February 1995, Pages 1059-1060.
    Preprint: [ Abstract ]

  4. Matzinger, M.; Fidler, J.; Gutfleisch, O.; Harris, I.R.,
    "Detailed TEM analysis of solid-HDDR Nd16Fe76B8 magnetic materials",
    IEEE Transactions on Magnetics, Volume: 31 Issue: 6 Part: 2, Nov. 1995, 3635 - 3637.
    [ Abstract ], [ PDF ]
    © 1995 IEEE see copyright notice

  5. J. Fidler,
    "Recent advances in magnetic materials",
    Proc. Int. Workshop on advanced materials and technologies, Helsinki Univ. of Technology, Finland, ed. by V.K.  Lindroos and T.Alander, ISBN951-22-2883-1, 1995, pp.287-304.

  6. J. Fidler,
    "Correlation between microstructure and properties of advanced Nd-Fe-B based magnets",
    Proc. 14. Annual Conf. on Properties and Applications of Magnetic Materials, Illinois Inst. of Techn., Chicago, 1995, p. 347-361.

  7. R. Fischer, T. Schrefl, H. Kronmüller and J. Fidler,
    "Phase distribution and computed magnetic properties of high-remanent composite magnets",
    Journal of Magnetism and Magnetic Materials, Volume 150, Issue 3, 1 November 1995, Pages 329-344.
    Preprint: [ Abstract ]

1994

  1. T. Schrefl, J. Fidler, H. Kronmüller,
    "Remanence and coercivity in isotropic nanocrystalline permanent magnets",
    Phys. Rev. B 49, 6100-6110 (1994).
    [ Abstract ], [ PDF ]

  2. T. Schrefl, J. Fidler and H. Kronmüller,
    "Nucleation fields of hard magnetic particles in 2D and 3D micromagnetic calculations",
    Journal of Magnetism and Magnetic Materials, Volume 138, Issue 1-2, 2 November 1994, Pages 15-30.
    Preprint: [ Abstract ]

  3. T. Schrefl, J. Fidler and H. Kronmüller,
    "Numerical simulation of magnetization reversal processes",
    CEAM Newsletters, 32 (1994), 4-6.

  4. Johannes Bernardi and Josef Fidler
    "Preparation and transmission electron microscope investigation of sintered Nd15.4Fe75.7B6.7Cu1.3Nb0.9 magnets",
    Journal of Applied Physics -- November 15, 1994 -- Volume 76, Issue 10, pp. 6241-6243
    © (1994) American Institute of Physics see copyright notice
    The following article appeared in JAP, 76 (1995) 6241-6243 and may be found at the publisher's website
    [ Abstract ], [ PDF ]

  5. T. Schrefl, R. Fischer, J. Fidler, H. Kronmüller
    "Two- and three-dimensional calculation of remanence enhancement of rare-earth based composite magnets (invited)",
    Journal of Applied Physics -- November 15, 1994 -- Volume 76, Issue 10, pp. 7053-7058.
    © (1994) American Institute of Physics see copyright notice
    The following article appeared in JAP, 76 (1994) 7053-7058 and may be found at the publisher's website
    [ Abstract ], [ PDF ]

  6. Josef Fidler, J. Bernardi, T. Schrefl and H.Kronmüller,
    "The influence of secondary phases on coercivity and remanence in rare earth-iron based magnets",
    Proc. VIII Int. Symposium on magnetic Anisotropy and Coercivity in Rare Earth Transition Metal Alloys, ed. by R. Harris, The University of Birmingham, U.K., 1994, p.385-404.

  7. H. Kronmüller, T. Schrefl, R. Fischer and J. Fidler,
    "Micromagnetic analysis of coercivity of rare earth-transition metal intermetallics and interstitial compounds",
    Proc. VIII Int. Symp. on magnetic Anisotropy and Coercivity in RE Transition Metal Alloys, ed. by R. Harris, The Univ. of Birmingham, U.K., 1994, p. 1-24.

  8. E. Estevez, J. Fidler, C. Short and I.R. Harris,
    "TEM-study of hot pressed HDDR Nd16Fe76B8 magnet materials",
    Proc. VIII Int. Symposium on magnetic Anisotropy and Coercivity in Rare Earth Transition Metal Alloys, ed. by R. Harris, The University of Birmingham, U.K., 1994, p.235-242.

  9. O. Gutfleisch, N. Martinez, I.R. Harris, M. Matzinger and J. Fidler,
    "Electron microscopy characterisation of a solid-HDDR processed Nd16Fe76B8 alloy",
    Proc. VIII Int. Symposium on magnetic Anisotropy and Coercivity in Rare Earth Transition Metal Alloys, ed. by R. Harris, The University of Birmingham, U.K., 1994, p.243-252.

  10. J. Bauer, M. Seeger, G. Rieger, H. Kronmüller, J. Bernardi and J. Fidler,
    "Magnetic properties and microstructures of Fe-Nd-B based permanent magnets with additives",
    Proc. VIII Int. Symposium on magnetic Anisotropy and Coercivity in Rare Earth Transition Metal Alloys, ed. by R. Harris, The University of Birmingham, U.K., 1994, p.405-414.

  11. M. Seeger, J. Bauer, H. Kronmüller, J. Bernardi and J.Fidler,
    "Magnetic and microstructural properties of sintered FeNdB-based magnets with Ga and Nb additions",
    J. Magn. Magn. Mater. 138 (1994), 294-300.
    [ Abstract]
    Sintered magnets based on the Fe14Nd2B phase were prepared by alloying the additive elements Ga and Nb, which mainly influence the microstructure and not the intrinsic magnetic properties. The room-temperature permanent magnetic properties are the intrinsic coercivity, mu 0Hc=1.70 T and the remanent polarization, Jr=1.20 T. From the temperature dependence of the coercive field the microstructural parameters alpha K and Neff were determined. Furthermore, the Kerr microscopy was used to investigate the domain patterns and the microstructure. Phase analyses showed that the low-melting element Ga forms new intergranular phases and the refractory metal Nb forms high-melting borides in the intergranular phases and small precipitates in the hard magnetic grains.

  12. H. Kronmüller, T. Schrefl
    "Interactive and cooperative magnetization processes in hard magnetic materials"
    J. Magn. Magn. Mater. vol.129, no.1; Jan. 1994; p.66-78.
    [ Abstract]
    Magnetization processes in rare earth-transition metal intermetallic compounds in general have to be investigated within the framework of three different scales: (1) The atomistic level taking into account the intrinsic magnetic properties of rare earth and transition metal ions. (2) The nanomagnetic level taking into account perturbations of exchange interactions and of the magnetic anisotropies in individual grains. (3) The micromagnetic level taking into account short range exchange interactions as well as long range dipolar interactions in ensembles of grains. It is shown that a universal relation may be derived for the coercive field of permanent magnets as produced by sintering, melt-spinning or mechanical alloying.


1993

  1. T. Schrefl; Schmidts-HF; J. Fidler; H. Kronmüller
    "The role of exchange and dipolar coupling at grain boundaries in hard magnetic materials"
    J. Magn. Magn. Mater. vol.124, no.3; June 1993; p.251-61
    [ Abstract]
    The minimization of the total magnetic Gibbs free energy of interacting magnetic particles is performed within the framework of a finite element formulation of the micromagnetic problem. Discretization errors are considerably reduced by an adaptive mesh refinement scheme. The investigation of intergrain exchange and magnetostatic interactions for various particle configurations emphasizes the important role of nonmagnetic boundary phases for the enhancement of coercivity. Intergrain exchange coupling drastically reduces the coercive field, especially if the angle between the easy axes of adjacent grains is large. The reduction of the coercive field owing to long-range magnetostatic interactions between the grains is less significant: the coercive field rises slightly with increasing angle between the easy axes of adjacent grains.

  2. T. Schrefl, H. F. Schmidts, J. Fidler, H. Kronmüller
    "Nucleation of reversed domains at grain boundaries",
    Journal of Applied Physics -- May 15, 1993 -- Volume 73, Issue 10 pp. 6510-6512
    © (1993) American Institute of Physics see copyright notice
    The following article appeared in JAP, 73 (1993) 6510-6512 and may be found at the publisher's website
    [ Abstract ], [ PDF ]

  3. Martin-VE; J. Bernardi; J. Fidler; Cebollada-F; Gonzalez-JM
    "Role of the heating rate up to the annealing temperature on the hysteretic properties of hard magnetic materials prepared from amorphous precursors"
    Journal of Alloys and Compounds. vol.191, no.1; 29 Jan. 1993; p.127-30
    [ Abstract]
    Data are presented on the influence of the heating rate up to the treatment temperature used during the crystallization of amorphous precursors of hard samples on the parameters characterizing their final demagnetization process. The results can be directly correlated to the microstructural features observed in the samples. It is concluded that the precipitation of deteriorating phases ( alpha -Fe) can be avoided by using sufficiently high heating rates, which demonstrates the relevance of this parameter.

  4. T. Schrefl, H.F. Schmidts, J. Fidler and H. Kronmüller,
    "Nucleation fields and grain boundaries in hard magnetic materials",
    IEEE Transactions on Magnetics, Volume: 29 Issue: 6 Part: 2, Nov. 1993, 2878 - 2880.
    [ Abstract ], [ PDF ]
    © 1993 IEEE see copyright notice

  5. J. Bernardi, J. Fidler, M. Seeger and H. Kronmüller,
    "Preparation and TEM-study of sintered Nd18Fe74B6Ga1Nb1 magnets",
    IEEE Transactions on Magnetics, Volume: 29 Issue: 6 Part: 2, Nov. 1993, 2773 - 2775.
    [ Abstract ], [ PDF ]
    © 1993 IEEE see copyright notice

  6. T. Schrefl; H. Kronmüller; J. Fidler
    "Exchange hardening in nano-structured two-phase permanent magnets"
    J. Magn. Magn. Mater. vol.127, no.3; Oct. 1993; p.L273-7
    [ Abstract]
    The coercive field of a magnetically soft prismatic grain of irregular cross-section embedded in a hard magnetic matrix has been calculated as a function of the size of the soft magnetic grain. To solve the corresponding two-dimensional micromagnetic problem a finite element technique was used. In spite of large deviation of the spontaneous magnetic polarization in the soft magnetic phase at low external fields, the numerical calculations reveal remarkable high values of the coercive field, if the size of the soft magnetic grains is sufficiently small.

1992

  1. T. Schrefl; J. Fidler
    "Numerical simulation of magnetization reversal in hard magnetic materials using a finite element method"
    J. Magn. Magn. Mater. vol.111, no.1-2; June 1992; p.105-14
    [ Abstract]
    The presented numerical approach to coercivity analysis combines a nucleation model of coercivity with the finite element method. The simulation program offers the opportunity to investigate the effect of material properties, the microstructure and the orientation of the applied field on the coercivity of an ensemble of hard magnetic grains. The influence of grain alignment and non-magnetic intergranular phases on the angular dependence of coercivity confirms the coupling of grains by dipole interactions. The stray field interaction between misaligned grains explains the deviation of the angular dependence of the coercive field from its theoretical values. In hard magnetic materials the interplay between microstructure and material properties is responsible for the coercivity. Stray field terms and material constants represent the microstructure and the material properties in the micromagnetic equation. To calculate the magnetic stray field of a given microstructure a finite element program has been developed. An algorithm for automatic mesh refinement adapts the finite element mesh to the given microstructure.

  2. Rabenberg-L; J. Fidler; J. Bernardi
    "Observation and characterization of a twinned monoclinic phase as a product of the solid state decomposition of Nd2Fe14B"
    Journal of Materials Research. vol.7, no.7; July 1992; p.1762-8
    [ Abstract]
    A microtwinned monoclinic phase is observed to occur within the grains of the hard magnetic phase in Nd2Fe14B-based permanent magnet alloys. This phase seems to be the product of a displacive solid state phase transformation of tetragonal Nd2Fe14B, distinguished from Nd2Fe14B by the presence of an ordered substitution into alternating unit cells parallel to the crystallographic c-axis and by a small shear of the type (100) (011). The four different orientational variants of this monoclinic phase with respect to the parent tetragonal phase are arranged into two distinct colonies of twin-related plates. The observation that Nd2Fe14B can undergo a displacive solid state transformation has broad implications for the entire field of Nd2Fe14B permanent magnets.

  3. J. Bernardi, J. Fidler and Lew Rabenberg,
    "TEM-investigation of a new monoclinic 2:14:1-phase in R-Fe-B magnets [R=Pr,Nd]",
    Proc. X. European Congress on Electron Microscopy, Granada, Spain, Sept. 1992, Vol.2, p. 95-96.

  4. N. Fuchs, J. Fidler, G. Gottschamel and P. Janz,
    "TEM-Characterization of Sol-Gel sintered corundum",
    Proc. X. European Congress on Electron Microscopy, Granada, Spain, Sept. 1992, Vol.2, p. 407-408.

  5. Josef Fidler and Johannes Bernardi,
    "New aspects of the microstructural investigations of rare earth iron based magnets",
    Proc.II. Int.Symposium on Physics of Magnetic Materials, Beijing, Editor: Shougong Zhang, International Academic Publishers, China, July 1992, p. 664-670 .

  6. Johannes Bernardi and Josef Fidler,
    "TEM-Analysis of (Nd,Dy)-(Fe,Co)-B:(Al,V) sintered permanent magnets",
    Proc. II. Int. Symposium on Physics of Magnetic Materials, Beijing, Editor: Shougong Zhang, International Academic Publishers,  China, July 1992, p. 711-714.

  7. Josef Fidler,
    "Two types of dopants with different microstructural effects leading to an improvement of rare earth-iron based permanent magnets",
    Proc. VII. Int. Symposium on magnetic Anisotropy and Coercivity in Rare Earth Transition Metal Alloys, ed. by B. Street, The University of Western Australia, 1992, p. 11-22.

  8. J. Bernardi, J. Fidler and Lew Rabenberg,
    "TEM analysis of hot-worked rare earth permanent magnets",
    Proc. XII. Int. Workshop on Rare Earth Magnets and their Applications, ed. by B. Street, The University of Western Australia, 1992, 400-409.

  9. J. Bernardi, J. Fidler and F. Födermayr,
    "The effect of V or W additives to microstructure and coercivity of Nd-Fe-B based magnets",
    IEEE Transactions on Magnetics, Volume: 28 Issue: 5 Part: 2, Sept. 1992, 2127 - 2129.
    [ Abstract ], [ PDF ]
    © 1992 IEEE see copyright notice

  10. J. Fidler
    "Influence of microstructure on coercivity of rare earth-iron permanent magnets"
    Magnetism, Magnetic Materials and their Applications. Proceedings of the International Workshop. IOP, Bristol, UK; 1992; xi+342 pp. p.55-68
    [ Abstract]
    Transmission electron microscopy has widely been used to characterize the complex multiphase microstructure of Nd2Fe14B based permanent magnets. The grain size of the magnets strongly depends on the processing technique. If dopants are added, the coercivity is increased. The author's investigations show that the effect of dopants on the microstructure can be divided into two groups each with similar microstructural features, thus two types of dopant elements can be distinguished independently of the processing technique: (1) Al, Ga, Cu (type 1 dopants) and (2) Nb, Mo, V (type 2 dopants). Both types of dopants increase the coercivity, whereas the microstructural mechanisms leading to the enhancement of coercivity are different for both types.

  11. J. Fidler
    "Electron microscopy of magnetic materials"
    Magnetism, Magnetic Materials and their Applications. Proceedings of the International Workshop. IOP, Bristol, UK; 1992; xi+342 pp. p.45-54
    [ Abstract]
    The purpose of this paper is to introduce into the electron microscopic techniques (analytical, high resolution and Lorentz microscopy) with special emphasis laid on results of newly developed soft and hard magnetic materials. In the light of the historical development of hard magnetic materials the improvement of the coercivity is closely related with a better microstructural understanding of the mechanisms leading to higher coercive forces.


1991

  1. Coene-W; Hakkens-F; Coehoorn-R; de-Mooij-DB; de-Waard-C; J. Fidler; Grossinger-R
    "Magnetocrystalline anistropy of Fe3B, Fe2B and Fe1.4Co0.6B as studied by Lorentz electron microscopy, singular point detection and magnetization measurements"
    J. Magn. Magn. Mater. vol.96, no.1-3; 1 June 1991; p.189-96
    [ Abstract]
    A magnetic domain study by means of Lorentz transmission electron microscopy has been carried out for the compounds Fe3B, Fe2B and Fe1.4Co0.6B. The magnetocrystalline anisotropy of these compounds has been derived from the Lorentz observations. Tetragonal Fe3B has an in-plane anistropy with a preferential orientation along (110). The orthorhombic modification of Fe3B has the easy magnetization axis along the (100) direction. The magnetocrystalline anisotropy of Fe2B and Fe1.4Co0.6B is found to be in-plane and uniaxial, respectively. The results for the latter two compounds are in agreement with those obtained from magnetic torque measurements, as reported in the literature. On the other hand, the results for tetragonal Fe3B are different from those derived earlier by means of the Bitter technique. Anisotropy fields were obtained from singular point detection experiments, and from magnetization curves. Implications of the results are discussed for the ratio between the remanence and saturation magnetization of Nd4Fe78B18 permanent magnet alloys, containing tetragonal Fe3B as the main phase.

  2. J. Fidler
    "Lorentz microscopy studies in permanent magnets"
    Science and Technology of Nanostructured Magnetic Materials. Proceedings of a NATO Advanced Study Institute. Plenum, New York, NY, USA; 1991; xi+720 pp. 627-33
    [ Abstract]
    The author briefly shows Lorentz electron microscopic results on new permanent magnetic materials, since in the light of the historical development of hard magnetic materials the improvement of the coercivity is closely related with a better microstructural understanding of the mechanisms leading to higher coercive forces.

  3. Josef Fidler and Johannes Bernardi
    "Transmission electron microscope characterization of cast and hot-worked R-Fe-B:Cu(R=Nd,Pr) permanent magnets",
    Journal of Applied Physics -- November 15, 1991 -- Volume 70, Issue 10, pp. 6456-6458
    © (1991) American Institute of Physics see copyright notice
    The following article appeared in JAP, 70 (1991) 6456-6458 and may be found at the publisher's website
    [ Abstract ], [ PDF ]

  4. Josef Fidler and Johannes Bernardi,
    "Why increases the addition of small amounts of dopants the coercivity of Nd2Fe14B based magnets?",
    Concerted European Action on Magnets  Final Report 2, published  by the EC, Brussels, May 1991, p.457.

  5. Josef Fidler,
    "Electron microscopy of magnetic materials",
    Proc. of Int. Workshop on Magnetism, Magnetic Materials and their Applications, La Habana, Cuba, May 1991, IOP Publishing Ltd., p. 45-54.

  6. Josef Fidler,
    "Influence of microstructure on coercivity of rare-earth iron permanent magnets",
    Proc. of Int. Workshop on Magnetism, Magnetic Materials and their Applications, La Habana, Cuba, May 1991, IOP Publishing Ltd., p. 55-68.

1990

  1. Knoch-KG; Henig-E-Th; J. Fidler
    "Correlation between Al addition and microstructural changes in Nd-Fe-B magnets"
    J. Magn. Magn. Mater. vol.83, no.1-3; Jan. 1990; p.209-10
    [ Abstract]
    Depending on the kind of Al addition (Al, Al2O3), two Al-containing phases and an Nd-rich, Fe-poor phase occur besides the hardmagnetic phase Nd2Fe14B, the Nd-rich FCC phase and the B-rich phase Nd5-Fe2B6. Al addition nearly halves the wetting angle of the liquid phase during liquid phase sintering.

  2. Josef Fidler, Johannes Bernardi, K. Ohashi and Y. Tawara,
    "Analytical electron microscopy of Sm(Co,Fe,Cu, Zr)9",
    IEEE Transactions on Magnetics, Volume: 26 Issue: 5, Sept. 1990, 1385 - 1387.
    [ Abstract ], [ PDF ]
    © 1990 IEEE see copyright notice

  3. Josef Fidler, Claudia Groiss and M. Tokunaga,
    "The influence of Ga-substitution on the coercivity of Nd-(Fe,Co)-B sintered permanent magnets",
    IEEE Transactions on Magnetics, Volume: 26 Issue: 5, Sept. 1990, 1948 - 1950.
    [ Abstract ], [ PDF ]
    © 1990 IEEE see copyright notice

  4. Josef Fidler, Claudia Groiss, J. Eisses and K.H.J. Buschow,
    "Analytical electron microscopy of cast (Nd1-xRx)13Fe80C7 [R=Tb,Dy] permanent magnet materials",
    Proceedings of the XII. Int. Congress for Electron Microscopy, San Francisco, USA, August (1990), Vol. 4, Materials Science, p. 784-785.

  5. Josef Fidler,
    "Influence of dopants on the microstructure and coercivity of Sm2Co17- and Nd2Fe14B- based permanent magnets",
    Proceedings of Conference on Hard Magnetic Materials, Slovak Academy of Sciences, 19. Sept. (1990), Bratislava, CSFR,p. 27-36.

  6. Josef Fidler, Claudia Groiss, J. Eisses and K.H.J. Buschow,
    "The influence of the microstructure on the coercivity of cast (Nd1-xRx)2Fe14C [R=Tb,Dy] based permanent magnet materials",
    Proc. XI. International Workshop on Rare Earth Magnets and their Applications, Oct. (1990), Pittsburgh, USA, Vol.I, p. 549-559.

  7. Josef Fidler,
    "The effect of dopants (Al, Ga, Cu, Mo, V) on microstructure and coercivity of sintered Nd2Fe14B based magnets",
    Proc. VI. Int. Symposium on magnetic anisotropy and coercivity in rare earth transition metal alloys, Oct. (1990), Pittsburgh, USA, Vol. II, p. 176-180.

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