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

doi:10.1063/1.4977490

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

Mesoscale and Nanoscale Physics 2017-04-05 v1

Authors: 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.

Keywords

ferromagnetic resonance YIG heavy metal bilayers spin-transfer torque Oersted field spin pumping thickness dependence

Cite

@article{arxiv.1612.06111,
  title  = {Thickness dependence study of current-driven ferromagnetic resonance in Y3Fe5O12/heavy metal bilayers},
  author = {Z. Fang and A. Mitra and A. L. Westerman and M. Ali and C. Ciccarelli and O. Cespedes and B. J. Hickey and A. J. Ferguson},
  journal= {arXiv preprint arXiv:1612.06111},
  year   = {2017}
}

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8 pages, 3 figures

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

Abstract

Keywords

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