Size effects on switching field of ring-shaped permalloy elements

[摘要] The magnetization switching behavior of permalloy ring elements as a function of ring diameter and film thickness by magneto resistance measurement is presented. The permalloy ring elements, with diameters of 2-5 mum and a thickness of 14-66 nm, were fabricated by electron beam lithography through a lift-off process. The switching field for the transition from the vortex state to the onion state increases with decreasing size. Furthermore, the switching field increases with increasing thickness up to a critical value of about 53-65 nm, over which the switching field tends to decrease with increasing thickness. (C) 2004 Elsevier B.V. All rights reserved.

[发布日期] 2004-11-01

[效力级别]  Proceedings Paper

[关键词] permalloy ring;magnetoresistance;coherent rotation