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Spin-Current Generation in Low-Damping Ni0.65Zn0.35Al0.8Fe1.2O4 Spinel Ferrite

M. T. Gray1,2,*, S. Emori2,3, B. A. Gray4, H. Jeon4,5, O. M. J. van ’t Erve6, B. T. Jonker6, S. Kim7, M. Suzuki8, T. Ono7 et al.

B. M. Howe4 and Y. Suzuki2,9

  • 1Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, USA
  • 2Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA
  • 3Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, USA
  • 4Materials and Manufacturing Directorate, Air Force Research Laboratory, Dayton, Ohio 45433, USA
  • 5Department of Electrical Engineering, Wright State University, Dayton, Ohio 45435, USA
  • 6Materials Science and Technology Division, Naval Research Laboratory, Washington, D.C. 45555, USA
  • 7Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
  • 8Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
  • 9Department of Applied Physics, Stanford University, Stanford, California 94305, USA

  • *Corresponding author. mattgray@stanford.edu
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Phys. Rev. Applied 9, 064039 – Published 25 June, 2018

DOI: https://doi.org/10.1103/PhysRevApplied.9.064039

Abstract

Low-damping spin sources are critical to efficient spin-current generation, but low-damping magnetic insulators have not been systematically explored so that the controlling parameters for efficient spin-current generation are not well understood. The choice of magnetic insulators with sufficiently low damping has been largely limited to Y3Fe5O12 (YIG), whose compatibility with existing microelectronics is problematic at best. Therefore, an alternative material or family of magnetic insulators with low damping would provide not only fundamental insight into the underlying mechanisms for low-damping magnetic insulators but also the foundation for a spin-current-based electronics future. The family of spinel ferrites includes a wide variety of magnetic insulators, but high damping in conventional spinel ferrites has made them poor spin-current sources. In this study, we demonstrate that microwave excitation of low-damping (Ni,Zn,Al) ferrite (NZAFO) efficiently generates spin current. Spin pumping from the ferrite to an adjacent metal layer is manifest in both an increase in Gilbert damping and the emergence of a voltage peak that occurs at ferromagnetic resonance (FMR). Magnetotransport measurements suggest negligible contributions from a proximity-induced magnetic layer in the metal. From FMR and magnetotransport measurements, we estimate the spin-mixing conductance at the NZAFO/Pt interface to be approximately 1014  Ω−1 m−2, on the same order of magnitude as the often-studied YIG/Pt interface. These results indicate that doped spinel ferrites can be efficient spin-pumping sources with a potential for highly tunable magnetic properties and coherent integration with a diverse range of complex oxides for all-oxide spintronics.

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Phys. Rev. Applied 9, 064039– Published 25 June, 2018
  • Received 15 August 2017
  • Revised 21 January 2018
Article part of CHORUS
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