Relationship between composite and imperfect materials in perpendicular recording media (invited)

R. H. Victora, Manish Kapoor, Alyssa K. Hamre, Stephanie Hernandez

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

It is common to model recording media as interacting coherently rotating magnetic moments, but real materials frequently exhibit perpendicular switching fields less than the anisotropy field and a different angular dependence than theoretically expected. Micromagnetic simulations were performed, which included multiple elements per grain and magnetostatic interactions between elements. Two likely explanations have emerged from this analysis: the existence of low anisotropy regions within the first few atomic layers of the sputtered film or anisotropy gradation throughout the grain thickness. Both explanations offer appropriate coercivity reductions; however, grains including anisotropy gradation display this effect at more realistic values of intragranular exchange. A simplified two element model was fit to the multidomain angle-dependent results in order to find a computationally simple description that can be easily included in a recording simulation.

Original languageEnglish (US)
Article number07F544
JournalJournal of Applied Physics
Volume103
Issue number7
DOIs
StatePublished - Apr 21 2008

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