YIG thickness and frequency dependence of the spin-charge current conversion in YIG/Pt systems

V. Castel; N. Vlietstra; J. Ben Youssef; B. J. van Wees

doi:10.1103/PhysRevB.90.214434

YIG thickness and frequency dependence of the spin-charge current conversion in YIG/Pt systems

Materials Science 2015-01-08 v1

Authors: V. Castel , N. Vlietstra , J. Ben Youssef , B. J. van Wees

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Abstract

We report the frequency dependence of the spin current emission in a hybrid ferrimagnetic insulator/normal metal system as function of the insulating layer thickness. The system is based on a yttrium iron garnet (YIG) film [0.2, 1, and 3 \mu m] grown by liquid-phase-epitaxy coupled with a spin current detector of platinum [6 nm]. A strong YIG thickness dependence of the efficiency of the spin pumping has been observed. The highest conversion factor \Delta V/P_{abs} has been demonstrated for the thinner YIG (1.79 and 0.55 mV/mW^{-1} at 2.5 and 10 GHz, respectively) which presents an interest for the realisation of YIG-based devices. A strong YIG thickness dependence of the efficiency of the spin pumping has been also observed and we demonstrate the threshold frequency dependence of the three-magnon splitting process.

Keywords

spin-charge current conversion YIG/Pt systems spin pumping yttrium iron garnet three-magnon splitting ferrimagnetic insulator

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@article{arxiv.1304.2190,
  title  = {YIG thickness and frequency dependence of the spin-charge current conversion in YIG/Pt systems},
  author = {V. Castel and N. Vlietstra and J. Ben Youssef and B. J. van Wees},
  journal= {arXiv preprint arXiv:1304.2190},
  year   = {2015}
}

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6 pages, 5 figures

YIG thickness and frequency dependence of the spin-charge current conversion in YIG/Pt systems

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