Fluctuation fields in perpendicular media

Author

Greaves, S.J. ; Muraoka, H.

Author_Institution

Tohoku Univ., Sendai, Japan

fYear

2005

fDate

4-8 April 2005

Firstpage

607

Lastpage

608

Abstract

In this paper, we used a micromagnetic model to examine the influence of the grain size dispersion and the distribution of easy axes on activation volume (V_act) and the shape of the fluctuation field (H_f) versus m curve. Simulations of a granular magnetic medium were carried out using a micromagnetic model based on the Landau-Lifshitz-Gilbert equation, including a random field term to represent thermal fluctuations. The results show that the factors which influence the shape of the H_f versus m curves for granular perpendicular media are; the angular distribution of easy axes, the average grain size and the width of the grain size distribution.

Keywords

fluctuations; grain size; granular materials; magnetisation; micromagnetics; Landau-Lifshitz-Gilbert equation; activation volume; easy axes; fluctuation fields; grain size dispersion; granular magnetic medium; micromagnetic model; perpendicular media; thermal fluctuations; Energy barrier; Fluctuations; Grain size; Magnetic field measurement; Magnetostatics; Micromagnetics; Saturation magnetization; Size measurement; Time measurement; Volume measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Magnetics Conference, 2005. INTERMAG Asia 2005. Digests of the IEEE International

Print_ISBN

0-7803-9009-1

Type

conf

DOI

10.1109/INTMAG.2005.1463732

Filename

1463732