The switching mechanism in BaFe particles

Author

Yan, Ying Dong ; Torre, Edward

Author_Institution

Dept. of Electr. Eng. & Comput. Sci., George Washington Univ., Washington, DC, USA

Volume

25

Issue

5

fYear

1989

fDate

9/1/1989 12:00:00 AM

Firstpage

3464

Lastpage

3466

Abstract

The magnetization switching mechanisms in barium-ferrite particles are examined using numerical micromagnetic calculations. When the particle´s aspect ratio is large, the observed reversal starts at the center of the BaFe platelet and is referred to as central switching. For smaller aspect ratios the coherent rotation mode is observed. The coercivity for BaFe particles is given and is compared with the classical values. The classical Stoner-Wolfarth formula, which used the oblate ellipsoidal demagnetizing factors, is found to introduce considerable errors for the coercivity and is corrected

Keywords

barium compounds; coercive force; demagnetisation; ferrites; magnetic properties of fine particles; magnetisation reversal; numerical methods; BaFe₁₂O₁₉; aspect ratio; classical Stoner-Wolfarth formula; coercivity; coherent rotation mode; ferrite particles; magnetization switching mechanisms; nucleation field formula; numerical micromagnetic calculations; oblate ellipsoidal demagnetizing factors; Anisotropic magnetoresistance; Demagnetization; Magnetic anisotropy; Magnetic switching; Magnetization; Magnetostatics; Micromagnetics; Perpendicular magnetic anisotropy; Perpendicular magnetic recording; Shape;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.42336

Filename

42336