Magnetization Reversal in Cubic Nanoparticles With Uniaxial Surface Anisotropy

Author

Skomski, Ralph ; Wei, Xiao-Hui ; Sellmyer, D.J.

Author_Institution

Dept. of Phys. & Astron., Nebraska Univ., Lincoln, NE

Volume

43

Issue

6

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

2890

Lastpage

2892

Abstract

The effect of surface anisotropy on the magnetization reversal in small magnetic particles is investigated. The model considers particles of cubic shape cut from a tetragonal crystal with cube faces in the (001) and equivalent planes. In particles having diameters of less than about 10 nm, the coercivity approaches the Stoner-Wohlfarth limit, but the anisotropy field differs from that of the bulk of the particles. With increasing particle size, the nucleation modes acquire the character of magnetic surface or bulk modes that reduce the coercivity

Keywords

coercive force; magnetic anisotropy; magnetic particles; magnetisation reversal; nanoparticles; nucleation; particle size; surface magnetism; Stoner-Wohlfarth limit; coercivity; cubic nanoparticles; magnetic particles; magnetization reversal; nucleation modes; particle size; uniaxial surface anisotropy; Anisotropic magnetoresistance; Couplings; Crystallization; Magnetic anisotropy; Magnetic materials; Magnetization reversal; Magnetostatics; Nanoparticles; Perpendicular magnetic anisotropy; Shape; Coercivity; magnetic particles; nucleation; surface anisotropy;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2007.892869

Filename

4202921