Issue
EPL
Volume 84, Number 1, October 2008
Article Number 17002
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI http://dx.doi.org/10.1209/0295-5075/84/17002
Published online 17 September 2008
EPL, 84 (2008) 17002
DOI: 10.1209/0295-5075/84/17002

Giant magnetoresistance behavior of pseudo spin valve rings with magnetostatically coupled elements

S. Jain and A. O. Adeyeye

Information Storage Materials Laboratory, Department of Electrical and Computer Engineering, National University of Singapore - Singapore 117576, Singapore

eleaao@nus.edu.sg

received 21 June 2008; accepted in final form 14 August 2008; published October 2008
published online 17 September 2008

Abstract
We have investigated the giant magnetoresistance (GMR) responses of the pseudo spin valve elliptical rings placed in close proximity with individual magnetic elements. Significant modifications to the GMR responses were observed due to the effects of magnetostatic coupling between the rings and the magnetic elements. We have shown that the stability of the vortex state in the rings can be systematically controlled by varying the orientation and position of the individual magnetic elements relative to the ring structure. Our experimental observations were verified by micromagnetic simulations.

PACS
75.30.Fv - Spin-density waves.
75.47.De - Giant magnetoresistance.
75.50.Cc - Other ferromagnetic metals and alloys.

© EPLA 2008