Thermal reversal of elongated ferromagnetic particles misoriented to the applied field

Author

Goll, Dagmar ; Bertram, H. Neal

Volume

40

Issue

4

fYear

2004

fDate

7/1/2004 12:00:00 AM

Firstpage

2416

Lastpage

2418

Abstract

The energy barrier to be overcome for thermal reversal, the reversal mode and the effective particle volume involved are determined by the saddle points of the energy surface. We investigate the influence of field misorientation, exchange-coupling and magnetostatic interaction for a 2:1 aspect ratio particle discretized into two subunits. Typically, increasing the field angle from 0° to 45° enhances the effective volume in both cases by more than 20%.

Keywords

diffusion barriers; exchange interactions (electron); ferromagnetic materials; magnetic particles; magnetisation reversal; magnetostatics; effective particle volume; elongated ferromagnetic particles; energy barrier; energy surface; exchange-coupling effect; field angle; field misorientation; magnetostatic interaction; reversal mode; thermal reversal; Anisotropic magnetoresistance; Crystallization; Energy barrier; Magnetic anisotropy; Magnetic recording; Magnetization reversal; Magnetostatics; Perpendicular magnetic anisotropy; Saturation magnetization; Temperature distribution; Elongated ferromagnetic particles; field misorientation; thermal reversal;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2004.830623

Filename

1325523