Aspect Ratio of the Ba-Ferrite Platelets in Recording Media

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Copyright (c) 1992 The Japan Society of Applied Physics
, , Citation Osamu Kohmoto et al 1992 Jpn. J. Appl. Phys. 31 3346 DOI 10.1143/JJAP.31.3346

1347-4065/31/10R/3346

Abstract

Ferromagnetic resonance (FMR) in particulate media for perpendicular recording has been studied by considering the shape anisotropy of the platelets and the volumetric packing factor. By the obtained FMR equation, the aspect ratio of 3.5 was derived from the angular dependence of the resonance fields in 34 GHz FMR measurements. The ratio is consistent with the value obtained by transmission electron microscopy.

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10.1143/JJAP.31.3346