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Exchange coupling in hybrid anisotropy magnetic multilayers quantified by vector magnetometry

Journal article
Authors C. Morrison
J. J. Miles
T. N. A. Nguyen
Yeyu Fang
Randy K. Dumas
Johan Åkerman
T. Thomson
Published in Journal of Applied Physics
Volume 117
Issue 17
ISSN 0021-8979
Publication year 2015
Published at Department of Physics (GU)
Language en
Links dx.doi.org/10.1063/1.4917336
Keywords SPIN-TORQUE OSCILLATOR, SPRING MAGNETS, MEDIA, Physics, Applied
Subject categories Physical Sciences

Abstract

Hybrid anisotropy thin film heterostructures, where layers with perpendicular and in-plane anisotropy are separated by a thin spacer, are novel materials for zero/low field spin torque oscillators and bit patterned media. Here, we report on magnetization reversal and exchange coupling in a archetypal Co/Pd (perpendicular)-NiFe (in-plane) hybrid anisotropy system studied using vector vibrating sample magnetometry. This technique allows us to quantify the magnetization reversal in each individual magnetic layer, and measure of the interlayer exchange as a function of non-magnetic spacer thickness. At large (> 1 nm) spacer thicknesses Ruderman-Kittel-Kasuya-Yosida-like exchange dominates, with orange-peel coupling providing a significant contribution only for sub-nm spacer thickness. (c) 2015 AIP Publishing LLC.

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