Geometry dependence on inverse spin Hall effect induced by spin pumping in Ni 81Fe 19/Pt films

H. Nakayama, K. Ando, K. Harii, T. Yoshino, R. Takahashi, Y. Kajiwara, K. Uchida, Y. Fujikawa, E. Saitoh

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Abstract

Geometric effects on the inverse spin Hall effect (ISHE) induced by the spin pumping driven by the ferromagnetic resonance (FMR) have been investigated quantitatively. We measured the FMR spectra and the electromotive force induced by the ISHE with changing the size and the thickness in Ni 81Fe 19/Pt films. The intensity of generated charge currents due to the ISHE changes systematically with changing the film geometry, which is consistent with the prediction of the ISHE. The experimental results show a clear difference between Ni 81Fe 19 and Pt thickness dependence of the ISHE induced by the spin pumping. With a constant Pt thickness, the intensity of the generated charge current is kept proportional to that of the injected spin-current density, which decreases with increased spin relaxation in the Ni 81Fe 19 layer due to interfacial effect, inversely proportional to its film thickness. On the other hand, reflecting the spin diffusion mechanism in the Pt layer, the charge current decreases significantly with the decrease of the Pt thickness, while injected spin-current density is almost kept constant.

Original languageEnglish
Article number144408
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume85
Issue number14
DOIs
Publication statusPublished - 2012 Apr 12

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Nakayama, H., Ando, K., Harii, K., Yoshino, T., Takahashi, R., Kajiwara, Y., Uchida, K., Fujikawa, Y., & Saitoh, E. (2012). Geometry dependence on inverse spin Hall effect induced by spin pumping in Ni 81Fe 19/Pt films. Physical Review B - Condensed Matter and Materials Physics, 85(14), [144408]. https://doi.org/10.1103/PhysRevB.85.144408