Write head analysis by using a parallel micromagnetic FEM

We develop a parallel micromagnetic finite-element method (micromagnetic-FEM) to handle a large number of micromagnetic elements and utilize it to analyze full head and media models. When the calculation domain decomposition and the one-one node communication are applied, the program shows four times faster calculation in eight CPU operation, as compared with one CPU calculation. We study head field and media magnetization reversal on the frequency of 714 MHz, using different yoke length heads of 6, 10, and 15 mu m. The shorter yoke head shows faster head field reversal and stronger head field strength, and the recorded media magnetization is also larger. The small damping parameter of the head causes not only smaller head field but also the disorder of the media transition.