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Domain structures and magnetization reversal in Co/Pd and CoFeB/Pd multilayers

Journal article
Authors R. Sbiaa
Mojtaba Ranjbar
Johan Åkerman
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/10.1063/1.4906281
Keywords RANDOM-ACCESS MEMORY, TUNNEL-JUNCTION, ANISOTROPY
Subject categories Physical Sciences

Abstract

Domain structures and magnetization reversal of (Co/Pd) and (CoFeB/Pd) multilayers with 7 and 14 repeats were investigated. The Co-based multilayers show much larger coercivities, a better squareness, and a sharper magnetization switching than CoFeB-based multilayers. From magnetic force microscopy observations, both structures show strong reduction in domains size as the number of repeats increases but the magnetic domains for Co-based multilayers are more than one order of magnitude larger than for CoFeB-based multilayers. By imaging domains at different times, breaks in the (CoFeB/Pd) multilayer stripes were observed within only few hours, while no change could be seen for (Co/Pd) multilayers. Although CoFeB single layers are suitable for magnetoresistive devices due to their large spin polarization and low damping constants, their lamination with Pd suffers mainly from thermal instability.

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