Ferromagnetic resonance spin pumping in CoFeB with highly resistive non-magnetic electrodes

Dong-Jun Kim; Sang-Il Kim; Seung-Young Park; Kyeong-Dong Lee; Byong-Guk Park

doi:10.1016/j.cap.2014.07.013

Ferromagnetic resonance spin pumping in CoFeB with highly resistive non-magnetic electrodes

Materials Science 2015-06-19 v1 Mesoscale and Nanoscale Physics

Authors: Dong-Jun Kim , Sang-Il Kim , Seung-Young Park , Kyeong-Dong Lee , Byong-Guk Park

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Abstract

The relative contribution of spin pumping and spin rectification from the ferromagnetic resonance of CoFeB/non-magnetic bilayers was investigated as a function of non-magnetic electrode resistance. Samples with highly resistive electrodes of Ta or Ti exhibit a stronger spin rectification signal, which may result in over-(or under-)estimation of the spin Hall angle of the materials, while those with low resistive electrodes of Pt or Pd show the domination of the inverse spin Hall effect from spin pumping. By comparison with samples of single FM layer and an inverted structure, we provide a proper analysis method to extract spin pumping contribution.

Keywords

ferromagnetic resonance spin pumping spin rectification CoFeB spin Hall angle inverse spin Hall effect

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@article{arxiv.1404.1993,
  title  = {Ferromagnetic resonance spin pumping in CoFeB with highly resistive non-magnetic electrodes},
  author = {Dong-Jun Kim and Sang-Il Kim and Seung-Young Park and Kyeong-Dong Lee and Byong-Guk Park},
  journal= {arXiv preprint arXiv:1404.1993},
  year   = {2015}
}

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10 pages, 4 figures

Ferromagnetic resonance spin pumping in CoFeB with highly resistive non-magnetic electrodes

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