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

Published

Author(s)

R R Sbiaa, Justin M. Shaw, Hans T. Nembach, M Al Bahri, M Ranjbar, J. ?kerman, S. N. Piramanayagam

Abstract

Multilayers of [Co/Ni(t)/Co/Pt]×8 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 μ0Hk = 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.
Citation
Journal of Physics D-Applied Physics
Volume
49

Keywords

Ferromagnetic resonance, perpendicular anisotropy, magnetic damping, magnetic force microscopy, magnetic tunnel junctions
Created August 20, 2016, Updated June 15, 2020