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



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


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.
Journal of Physics D-Applied Physics


Ferromagnetic resonance, perpendicular anisotropy, magnetic damping, magnetic force microscopy, magnetic tunnel junctions


R Sbiaa, R. , Shaw, J. , Nembach, H. , Al Bahri, M. , Ranjbar, M. , ?kerman, J. and Piramanayagam, S. (2016), Ferromagnetic resonance measurements of (Co/Ni/Co/Pt) multilayers with perpendicular magnetic anisotropy, Journal of Physics D-Applied Physics, [online],, (Accessed June 14, 2024)


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Created August 19, 2016, Updated October 12, 2021