Magnetization reversals in elliptical permalloy particles

Author

Wei, Zung-Hang ; Lai, Mei-Feng ; Chang, Ching-Ray ; Usov, N.A. ; Wu, J.C. ; Lai, Jun-Yang

Author_Institution

Dept. of Phys., Nat. Taiwan Univ., Taipei, Taiwan

Volume

40

Issue

4

fYear

2004

fDate

7/1/2004 12:00:00 AM

Firstpage

2107

Lastpage

2109

Abstract

We use the micromagnetic simulation to study the reversible and irreversible magnetization processes of the single-domain elliptical permalloy particles. The magnetization curve of the reversible process, which has no hysteresis, obtained by applying the field along the hard axis of the elliptical particle is almost linear, as is the case in the single-domain ellipsoidal particle. On the other hand, due to the occurrence of the nonuniform reversal, the switching field of the irreversible process, which has hysteresis, is reduced significantly compared to that predicted by the Stoner-Wohlfarth model. The nucleation fields of elliptical particles are calculated as a function of ellipse´s aspect ratio, and the function reveals a step-like behavior.

Keywords

Permalloy; magnetic hysteresis; magnetisation reversal; micromagnetics; simulation; Stoner-Wohlfarth model; aspect ratio; ellipsoidal particle; elliptical permalloy particles; hard axis; hysteresis; irreversible magnetization; magnetization curve; magnetization reversal; micromagnetic simulation; nonuniform reversal; nucleation field; reversible magnetization; switching field; Ellipsoids; Magnetic anisotropy; Magnetic fields; Magnetic hysteresis; Magnetic materials; Magnetization processes; Magnetostatics; Micromagnetics; Perpendicular magnetic anisotropy; Saturation magnetization; Magnetization reversal; Stoner–Wohlfarth model; micromagnetic simulation;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2004.832252

Filename

1325421