Control of magnetic vortex chirality in square ring micromagnets -: art. no. 083904

被引：19

作者：

Libál, A ^{[1
]}

Grimsditch, M

Metlushko, V

Vavassori, P

Jankó, B

机构：

[1] Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA

[2] Argonne Natl Lab, Div Sci Mat, Argonne, IL 60439 USA

[3] Univ Illinois, Dept Elect & Comp Engn, Chicago, IL 60607 USA

[4] INFM, Natl Ctr S3, Ferrara, Italy

[5] Univ Ferrara, Dipartimento Fis, I-44100 Ferrara, Italy

来源：

JOURNAL OF APPLIED PHYSICS | 2005年 / 98卷 / 08期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1063/1.2113407

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We investigate the effect of a deliberately introduced shape asymmetry on magnetization reversal in small, square-shaped, magnetic rings. The magnetization reversal process is investigated using the diffracted magneto-optical Kerr effect combined with micromagnetic simulations. Experimentally we find that the reversal path is sensitive to small (+/- 1 degrees) changes in the direction of the applied field. Micromagnetic simulations that reproduce the measured zeroth- and first-order loops allow us to identify the reversal mechanisms as due to different intermediate states, namely, the so-called vortex and horseshoe states. Based on our results we are now able to prescribe a methodology for writing a vortex state with specific chirality in these asymmetric rings. Such control will be necessary if patterned arrays of this kind are to be used as magnetic storage elements. (c) 2005 American Institute of Physics.

引用

页数：6

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