Longitudinal magneto-optic Kerr effect detection of latching vortex magnetization chirality in individual mesoscale rings

被引：11

作者：

Bowden, S. R. ^{[1
]}

Ahmed, K. K. L. ^{[1
]}

Gibson, U. J. ^{[1
]}

机构：

[1] Dartmouth Coll, Thayer Sch Engn, Hanover, NH 03755 USA

来源：

APPLIED PHYSICS LETTERS | 2007年 / 91卷 / 23期

关键词：

D O I：

10.1063/1.2822814

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report on a method for breaking the symmetry of the optical signal arising from vortex magnetization in individual micron scale rings. A dielectric coating enhances the longitudinal magneto-optical Kerr effect signal from one half of the ring, while leaving the magnetic interactions unperturbed. The chirality of a single ring can be determined using this method, even with a beam waist much larger than the ring diameter. We observed switchable chirality in clipped 5 mu m diameter Permalloy (Ni80Fe20) rings using a longitudinal measurement field and demonstrated that the rotation sense could be reversed repeatedly with a momentary transverse field of +/- 150 Oe.(c) 2007 American Institute of Physics.

引用

页数：3

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