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Ferromagnetic resonance measurements of (Co/Ni/Co/Pt) multilayers with perpendicular magnetic anisotropy

Journal article
Authors R. Sbiaa
J. M. Shaw
H. T. Nembach
M. Al Bahri
M. Ranjbar
Johan Åkerman
S. N. Piramanayagam
Published in Journal of Physics D-Applied Physics
Volume 49
Issue 42
ISSN 0022-3727
Publication year 2016
Published at Department of Physics (GU)
Language en
Links dx.doi.org/10.1088/0022-3727/49/42/...
Keywords magnetic multilayers, perpendicular magnetic anisotropy, magnetic force microscopy, ferromagnetic, spin-torque oscillator, droplet solitons, Physics
Subject categories Physical Sciences

Abstract

Multilayers of [Co/Ni(t)/Co/Pt](x8) with varying Ni thickness were investigated for possible use as a free layer in magnetic tunnel junctions and spintronics devices. The thickness t of the Ni sub-layer was varied from 0.3 nm to 0.9 nm and the resulting magnetic properties were compared with (Co/Ni) and (Co/Pt) multilayers. As determined from magnetic force microscopy, magnetometry and ferromagnetic resonance measurements, all multilayers exhibited perpendicular magnetic anisotropy. Compared with (Co/Pt) multilayers, the sample with t of 0.9 nm showed almost the same anisotropy field of mu H-0(k) = 1.15 T but the damping constant was 40% lower. These characteristics make these multilayers attractive for spin torque based magnetoresistive devices with perpendicular anisotropy.

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