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An eddy‐current and micromagnetism model with applicationsto disk write heads
Author(s) -
Sun J.,
Collino F.,
Monk P. B.,
Wang L.
Publication year - 2004
Publication title -
international journal for numerical methods in engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.421
H-Index - 168
eISSN - 1097-0207
pISSN - 0029-5981
DOI - 10.1002/nme.1018
Subject(s) - micromagnetics , discretization , eddy current , finite element method , head (geology) , current (fluid) , computer science , mechanics , finite difference method , physics , mathematical analysis , mathematics , magnetization , geology , thermodynamics , quantum mechanics , geomorphology , magnetic field
As data rates increase and the size of the disk write head decreases it is likely that a standard non‐linear eddy‐current simulation of a disk write head will not fully capture dynamic effects. In this paper we propose a coupled eddy‐current and micromagnetics model for the disk write head. We present a simple finite difference formulation derived from a mass‐lumped finite element method. This derivation allows us to verify that, before time discretization, the semi‐discrete scheme obeys the same energy decay equality as the partial differential equation model. We show some numerical results for an ‘academic’ disk writer model. Copyright © 2004 John Wiley & Sons, Ltd.