Thermal stability in longitudinal thin film media

Author

Akagi, F. ; Igarashi, M. ; Yoshida, K. ; Nakatani, Y. ; Hayashi, N.

Author_Institution

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

Volume

37

Issue

4

fYear

2001

fDate

7/1/2001 12:00:00 AM

Firstpage

1534

Lastpage

1536

Abstract

Thermal stability in longitudinal thin film media was studied using a Monte-Carlo simulation. As recording densities increase, the signal decay ratios increase. The effect of the density is, however, very small. Between two materials with identified thermal stability factors ⟨K_uV⟩/kT (where, K_u is the anisotropy constant, V is the volume of a grain, k is Boltzmann´s constant, T is the temperature, and ⟨⟩ means an average value), the medium with smaller grains was found to be more stable against thermal fluctuations. These phenomena are related to the magnetic fields that are applied to grains in the media, which make the magnetization stable against thermal fluctuation

Keywords

Monte Carlo methods; demagnetisation; grain size; magnetic recording; magnetic thin films; magnetisation reversal; remanence; thermal stability; Boltzmann´s constant; Langevin equation; Monte-Carlo simulation; anisotropy constant; demagnetization; grain volume; longitudinal thin film media; magnetization reversal probability; recording density dependence; remanence; signal decay ratios; thermal fluctuations; thermal stability; Anisotropic magnetoresistance; Equations; Fluctuations; Grain size; Magnetic recording; Magnetization; Temperature; Thermal factors; Thermal stability; Transistors;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.950892

Filename

950892