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arXiv · 1612.06111

Thickness dependence study of current-driven ferromagnetic resonance in Y3Fe5O12/heavy metal bilayers

Z. Fang·A. Mitra·A. L. Westerman·M. Ali·C. Ciccarelli·O. Cespedes·B. J. Hickey·A. J. Ferguson
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Abstract

We use ferromagnetic resonance to study the current-induced torques in YIG/heavy metal bilayers. YIG samples with thickness varying from 14.8 nm to 80 nm, with Pt or Ta thin film on top, are measured by applying a microwave current into the heavy metals and measuring the longitudinal DC voltage generated by both spin rectification and spin pumping. From a symmetry analysis of the FMR lineshape and its dependence on YIG thickness, we deduce that the Oersted field dominates over spin-transfer torque in driving magnetization dynamics.

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Z. Fang, A. Mitra, A. L. Westerman, M. Ali, C. Ciccarelli, O. Cespedes, B. J. Hickey, A. J. Ferguson. 2016-12-19. Thickness dependence study of current-driven ferromagnetic resonance in Y3Fe5O12/heavy metal bilayers. https://doi.org/10.1063/1.4977490

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