Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Magnetoresistance Magnetometry of (Ni80Fe20)1-xIrx Wires with Varying Anisotropic Magnetoresistance Ratio

Published

Author(s)

C A. Vaz, E Blackburn, M Klaui, J A. Bland, L Gan, William F. Egelhoff Jr., E Cambril, G Faini, W Wernsdorfer

Abstract

We report room and low temperature magnetoresistance measurements on sub-micrometer scale elements (wires and crosses, 1.0, 0.5 and 0.1 m) of (Ni80Fe20)1-xIrx (x approximately equal} 2 %) with varying Ir concentrations. For the particular Ir concentrations studied, the anisotropic magnetoresistance(AMR) ratio varied between -0.043% and -0.035% at room temperature. For thesingle wires (0.5- 1 υm) the MR versus eld characteristic is similar to that reported for (Ni80Fe20) wires of similar size, but an opposite sign of the AMR is observed for x > 2 %. For H parallel to the wire axis, the reversal is determined by the sweeping of a few domains which give rise to 'ears' in the MR-Hcharacteristic. For H perpendicular to the wire, a parabolic variation is seen corresponding torotation of the magnetisation, but a negative slope in the MR-H characteristic is obtained at high fields as in permalloy wires. This suggests that the high field behaviour originates from a distinctly different mechanism (e.g., surface scattering) from that of AMR.
Citation
Journal of Applied Physics
Volume
93
Issue
No. 10

Keywords

domains, Ir alloy, magnetoresistance, permalloy, surface scattering

Citation

Vaz, C. , Blackburn, E. , Klaui, M. , Bland, J. , Gan, L. , Egelhoff Jr., W. , Cambril, E. , Faini, G. and Wernsdorfer, W. (2003), Magnetoresistance Magnetometry of (Ni<sub>80</sub>Fe<sub>20</sub>)<sub>1-x</sub>Ir<sub>x</sub> Wires with Varying Anisotropic Magnetoresistance Ratio, Journal of Applied Physics (Accessed April 18, 2024)
Created April 30, 2003, Updated October 12, 2021