T Schrefl, ME Schabes, D Suess, M Stehno
IEEE Trans Magn 40 (2004) 2341-2343
Magnetic recording at fast data rates requires write heads with
rapid rise times of the magnetic flux during the write process.
We present three-dimensional (3-D) micromagnetic finite-element
(FEM) calculations of an entire ring head (including 3-D coil
geometry) during the writing of magnetic bits in granular
media. The calculation of the obtainable flux rise times takes
into account the current rise in the coils, the magnetization
processes in the yoke, the magnetization processes in the pole
regions near the gap, as well as the magnetization dynamics in
the magnetic recording media. The simulations demonstrate how
input current profiles translate into magnetization processes
in the head and media during writing.