Title :
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
fDate :
7/1/2001 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on
