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Reversal mode instability and magnetoresistance in perpendicular (Co/Pd)/Cu/(Co/Ni) pseudo-spin-valves

Journal article
Authors J. E. Davies
D. A. Gilbert
S. M. Mohseni
Randy K. Dumas
Johan Åkerman
K. Liu
Published in Applied Physics Letters
Volume 103
Issue 2
Pages Article Number: 022409
ISSN 0003-6951
Publication year 2013
Published at Department of Physics (GU)
Pages Article Number: 022409
Language en
Links dx.doi.org/10.1063/1.4813393
Keywords giant magnetoresistance, magnetization reversal, transfer torques, anisotropy, multilayers, junctions, films
Subject categories Physical Sciences

Abstract

We have observed distinct temperature-dependent magnetization reversal modes in a perpendicular (Co/Pd)(4)/Co/Cu/(Co/Ni)(4)/Co pseudo-spin-valve, which are correlated with spin-transport properties. At 300 K, magnetization reversal occurs by vertically correlated domains. Below 200 K the hysteresis loop becomes bifurcated due to laterally correlated reversal of the individual stacks. The magnetic configuration change also leads to higher spin disorders and a significant increase in the giant magnetoresistance effect. First order reversal curve measurements reveal that the coupled state can be re-established through field cycling and allow direct determination of the interlayer coupling strength as a function of temperature. (C) 2013 AIP Publishing LLC.

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