Micromagnetic simulation for antiferromagnetically coupled recording media

Author

Lee, C.H. ; Wang, J.P. ; Chong, T.C.

Author_Institution

Data Storage Inst., Singapore

Volume

37

Issue

4

fYear

2001

fDate

7/1/2001 12:00:00 AM

Firstpage

1515

Lastpage

1517

Abstract

Hysteresis properties of the antiferromagnetic-coupled recording film media are studied via micromagnetic simulation. The theoretical model is discussed in detail. The effect of the antiferromagnetic coupling constant J on the hysteresis loop and recording performance is reported. Kink is observed in the hysteresis loop due to the reversal of lower layer magnetization. The kink occurs in the positive field region when |J|>2K_u2t₂ (under zero temperature environment). The coercivity increased with the increase of the antiferromagnetic coupling constant. Antiferromagnetically coupled media with kink in positive field region show a smaller transition length and noise. The track edge-noise increased and broadened for AFC media with kink in the negative field region

Keywords

coercive force; exchange interactions (electron); magnetic hysteresis; magnetic multilayers; magnetic recording noise; magnetic thin films; magnetisation reversal; antiferromagnetic coupling constant; antiferromagnetically coupled recording media; coercivity; hysteresis loop kink; hysteresis properties; lower layer magnetization reversal; micromagnetic simulation; negative field region; positive field region; recording performance; superparamagnetic limit; track edge-noise; zero temperature environment; Antiferromagnetic materials; Coercive force; Couplings; Disk recording; Magnetic films; Magnetic hysteresis; Magnetic recording; Magnetic separation; Magnetization; Micromagnetics;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.950887

Filename

950887