Title :
Collective thermal fluctuations in nominally “independent” granular recording media: application to thermal decay
Author :
Safonov, Vladimir L. ; Bertram, H. Neal
Author_Institution :
Center for Magnetic Recording Res., California Univ., San Diego, La Jolla, CA, USA
fDate :
7/1/2001 12:00:00 AM
Abstract :
We present initial results of a study of a system of fine magnetic grains with resonance interactions. For the case of magnetostatic and exchange interactions a general criterion for collective magnetization motion of a pair of grains is derived. Simulations demonstrate a dynamic cluster structure in both longitudinal and perpendicular recording media. These clusters may significantly reduce thermal degradation of recorded patterns. An indirect interaction between grains through an antiferromagnetic substrate is also discussed
Keywords :
antiferromagnetism; exchange interactions (electron); fluctuations; granular materials; magnetic particles; magnetic recording; magnetic resonance; magnetisation; perpendicular magnetic recording; antiferromagnetic substrate; collective magnetization motion; collective thermal fluctuations; dynamic cluster structure; exchange interactions; fine magnetic grains; indirect interaction; longitudinal recording media; magnetostatic interactions; nominally independent granular recording media; perpendicular recording media; resonance interactions; thermal decay; thermal degradation; Anisotropic magnetoresistance; Elementary particle exchange interactions; Fluctuations; Magnetic anisotropy; Magnetic recording; Magnetic resonance; Magnetization; Magnetostatic waves; Perpendicular magnetic anisotropy; Perpendicular magnetic recording;
Journal_Title :
Magnetics, IEEE Transactions on
