Coherent Rotation and Effective Anisotropy

Author

Zhao, G.P. ; Wang, X.L. ; Feng, Y.P. ; Huang, C.W.

Author_Institution

Inst. of Solid State Phys., Sichuan Normal Univ., Chengdu

Volume

43

Issue

6

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

2908

Lastpage

2910

Abstract

It is shown in this paper that the concept of effective anisotropy is of sound physical sense only when the nucleation mode is coherent rotation. Comparison of coherent and incoherent nucleation fields demonstrates that the coherent rotation can take place at very small defect size. The critical size below which the coherent rotation is favorable is roughly the domain wall-width with 3-D soft defects and is smaller for oriented exchange-coupled permanent magnets with planar soft defects. The effect of misaligned grains has also been considered and it is illustrated that the effective anisotropy has to be used very carefully: it can only be used in limited cases and its expression varies as the microstructures change

Keywords

magnetic anisotropy; magnetic domain walls; nucleation; 3-D soft defects; coherent rotation; domain wall; effective anisotropy; microstructures; nucleation mode; oriented exchange-coupled permanent magnets; Anisotropic magnetoresistance; Coercive force; Magnetic anisotropy; Magnetic materials; Micromagnetics; Perpendicular magnetic anisotropy; Physics; Saturation magnetization; Superconducting magnets; Superconducting materials; Coherent rotation; effective anisotropy; nucleation modes;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2007.893629

Filename

4202739