Vortex states in soft magnets in two and three dimensions

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:322

Article; Proceedings Paper

Diao, Zhu¹ 

[1] Trinity Coll Dublin, CRANN, Dublin 2, Ireland

关键词: Micromagnetics;    Magnetization reversal;    Nanodot array;    e-beam lithography;   

DOI  :  10.1016/j.jmmm.2009.04.077

来源: Elsevier

【 摘 要 】

The magnetization curves of arrays of near-spherical soft ferromagnetic particles are compared with those of quasi-two-dimensional dots with similar radius prepared by a rapid e-beam lithographic technique. Curves for the three-dimensional particles are anhysteretic and fit a M(H)/M-s = tanh(c mu H-0) law, where as the two-dimensional arrays show irreversible segments in the first and third quadrants where the planar vortex state transforms to a collinear state by discontinuous rotation of magnetization about an axis perpendicular to the vortex axis. The additional symmetry of the spherical particle allows this rotation to occur continuously, without energy barriers due to the demagnetizing field. (C) 2009 Elsevier B.V. All rights reserved.

【 授权许可】

Free