Computer simulation of thermal activation volume in HDD media

Author

Igarashi, M. ; Akagi, F. ; Sugita, Y.

Author_Institution

Central Res. Lab., Hitachi Ltd., Tokyo, Japan

Volume

37

Issue

4

fYear

2001

fDate

7/1/2001 12:00:00 AM

Firstpage

1386

Lastpage

1388

Abstract

The thermal activation volume in hard-disk media was investigated through micro-magnetic simulation. It was found that the activation volume should be obtained by using the time-dependent irreversible magnetization (viscosity). The method using the total magnetization including the reversible magnetization leads to a wrong dependence of the activation volume on the field. The relationship between the switching volume in a hard-disk medium and the activation volume is described as a function of the exponent of the dynamic coercivity, the switching field, and the anisotropy field

Keywords

coercive force; disc drives; hard discs; magnetic aftereffect; magnetic anisotropy; magnetic switching; magnetisation; anisotropy field; computer simulation; dynamic coercivity; hard disk drive; magnetic recording; magnetic viscosity; micromagnetic model; switching field; switching volume; thermal activation volume; time-dependent irreversible magnetization; Anisotropic magnetoresistance; Coercive force; Computational modeling; Computer simulation; Equations; Fluctuations; Hard disks; Remanence; Saturation magnetization; Viscosity;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.950849

Filename

950849