Thickness dependence of spin torque ferromagnetic resonance in Co75Fe25/Pt bilayer films

Ganguly, A. ; Kondou, K. ; Sukegawa, H. ; Mitani, S. ; Kasai, S. ; Niimi, Y. ; Otani, Y. ; Barman, A. (2014) Thickness dependence of spin torque ferromagnetic resonance in Co75Fe25/Pt bilayer films Applied Physics Letters, 104 (7). 072405. ISSN 0003-6951

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Official URL: http://doi.org/10.1063/1.4865425

Related URL: http://dx.doi.org/10.1063/1.4865425

Abstract

The spin Hall angle of Pt in Co75Fe25/Pt bilayer films was experimentally investigated by means of the spin-torque ferromagnetic resonance and the modulation of damping measurements. By comparing the present results with the Ni80Fe20/Pt system, we found that the ferromagnetic layer underneath the Pt one greatly affects the estimation of the spin Hall angle. We also discuss the spin diffusion length of Pt and the ferromagnetic thickness dependence of the Gilbert damping coefficient. We acknowledge the financial supports from the Department of Science and Technology, Government of India under Grant No. INT/JP/JST/P-23/09, Department of Information Technology Government of India under Grant No. 1(7)/2010/M&C, and Japan Science and Technology Agency Strategic International Cooperative Program under Grant No. 09158876.

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