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.
R Sbiaa, R.
, Shaw, J.
, Nembach, H.
, Al Bahri, M.
, Ranjbar, M.
, ?kerman, J.
and Piramanayagam, S.
Ferromagnetic resonance measurements of (Co/Ni/Co/Pt) multilayers with perpendicular magnetic anisotropy, Journal of Physics D-Applied Physics, [online], https://doi.org/10.1088/0022-3727/49/42/425002, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=921059
(Accessed December 5, 2023)