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Temperature effect on exchange coupling and magnetization reversal in antiferromagnetically coupled (Co/Pd) multilayers

Journal article
Authors R. Sbiaa
I. A. Al-Omari
P. R. Kharel
Mojtaba Ranjbar
D. J. Sellmyer
Johan Åkerman
S. N. Piramanayagam
Published in Journal of Applied Physics
Volume 118
Issue 6
ISSN 0021-8979
Publication year 2015
Published at Department of Physics (GU)
Language en
Links dx.doi.org/10.1063/1.4928318
Keywords PERPENDICULAR-ANISOTROPY, PATTERNED MEDIA, Physics, Applied
Subject categories Physical Sciences

Abstract

Magnetization reversal of antiferromagnetically coupled (AFC) soft and hard (Co/Pd) multilayers was studied as a function of temperature. While the hard [Co(0.3 nm)/Pd(0.8 nm)](x10) was kept unchanged, the softness of the [Co(t)/Pd(0.8 nm)](x3) was controlled by varying the thickness t of the Co sublayer. Clear two-step hysteresis loops were observed for all the investigated multilayers with t ranging between 0.4 and 1 nm. The spin reorientation of the soft layer magnetization from in-plane direction to out-of-plane direction was investigated from 50 to 300 K. The antiferromagnetic field H-AFC measured from the shift of the minor hysteresis loop reveals a good agreement to the quantum-well model. From the out-of-plane hysteresis loop of the uncoupled soft layer, its magnetization shows an in-plane orientation for t >= 0.6 nm. The strong H-AFC helps to induce an out-of plane orientation of the soft layer with a linear decrease of its coercivity with temperature. These investigated structures show the possibility to reduce the unwanted stray field and improving the out-of-plane anisotropy even for relatively thicker soft layer. (c) 2015 AIP Publishing LLC.

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