Micromagnetic Study on Thermally Induced Magnetization Reversal of a Coupled Spin Chain System

Author

Cheng, X.Z. ; Jalil, M.B.A. ; Lee, Hwee Kuan

Author_Institution

Dept. of Electr. & Comput. Eng., Nat. Univ. of Singapore

Volume

43

Issue

6

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

2899

Lastpage

2901

Abstract

We performed numerical studies of the dynamics of thermally induced magnetization reversal of a coupled Heisenberg spin chain, based on the stochastic Landau-Lifshitz-Gilbert equation. Special attention is given to characterizing the transitions between different switching mechanisms (e.g., coherent rotation, soliton, and multidroplet reversals), as the chain length L is increased. Our calculations reveal that the switching time, switching time distribution, and the time evolution behavior of magnetization reversal display nontrivial dependence on the chain length L, and undergo distinct transitions as a function of L. In particular, we found that the switching time distribution is an important determinant of thermal stability, in addition to the mean switching time

Keywords

Heisenberg model; magnetic switching; magnetisation reversal; magnetocaloric effects; micromagnetics; stochastic processes; thermal stability; coupled Heisenberg spin chain; magnetic switching; magnetization reversal; micromagnetics; stochastic Landau-Lifshitz-Gilbert equation; thermal stability; Couplings; Equations; Magnetic anisotropy; Magnetic moments; Magnetic switching; Magnetization reversal; Micromagnetics; Perpendicular magnetic anisotropy; Saturation magnetization; Thermal stability; Coupled spin chain; switching mechanism; thermally induced magnetization;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2007.892997

Filename

4202672