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Thickness dependence study of current-driven ferromagnetic resonance in Y3Fe5O12/heavy metal bilayers
2017
Applied Physics Letters
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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.
doi:10.1063/1.4977490
fatcat:myxvjaxkbvgldpfq2j6ntcjszm