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Ni thickness influence on magnetic properties (Co/Ni/Co/Pt) multilayers with perpendicular magnetic anisotropy

Journal article
Authors R. Sbiaa
I. A. Al-Omari
M. Al Bahri
P. R. Kharel
Mojtaba Ranjbar
Johan Åkerman
D. J. Sellmyer
Published in Journal of Magnetism and Magnetic Materials
Volume 441
Pages 585-589
ISSN 0304-8853
Publication year 2017
Published at Department of Physics (GU)
Pages 585-589
Language English
Links doi.org/10.1016/j.jmmm.2017.06.054
Keywords temperature-dependence, droplet solitons, damping constant, field, excitations, films, Materials Science, Physics, zybylski m, 1991, applied physics a-materials science & processing, v52, p33
Subject categories Physical Sciences

Abstract

We present a study of perpendicular magnetic anisotropy in [Co/Ni(t)/Co/Pt](x8) multilayers for use as free layers in magnetic tunnel junctions (MTJ) and spin valves. The thickness t of the Ni sub-layer was varied and the resulting magnetic properties were investigated. As determined from magnetic force microscopy and magnetometry measurements, all multilayers exhibited a perpendicular magnetic anisotropy with an increase of saturation magnetization with thickness t. From the temperature dependence of the magnetization, well described by a Bloch law, we find that the spin-wave stiffness constant of the [Co/Ni(t)/Co/Pt](x8) multilayers is larger compared to (Co/Ni) multilayers. These multilayers could be the basis for spintronic devices where the reduction of total Pt content could help to reduce the damping constant while keeping the magnetic anisotropy energy relatively high. These are conflicting requirements needed for high performance magnetic memory devices. (C) 2017 Elsevier B.V. All rights reserved.

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