Low-temperature spin-Seebeck effect in the helimagnetic insulator Cu$_2$OSeO$_3$

ORAL

Abstract

We report on measurements of the longitudinal spin-Seebeck effect in single crystals of the helimagnetic insulator Cu$_2$OSeO$_3$ in the range $0.5 {\rm K} \leq T\leq 15 {\rm K}$, using sputtered Pt thin films for spin-current detection. Simultaneous determination of magnon thermal conductivities for each specimen allows for a ``calibration'' of the spin current. The influence on the inverse spin-Hall signal of the helical-conical and conical-collinear magnetic phase transitions as well as different crystallographic orientations for the heat flow and applied magnetic field, will be discussed.

*This material is based on work supported by the U.S. DOE, Off. of BES, Div. of Mater. Sci. and Eng., under grants No. DEFG02-12ER46888 (Miami), DEFG02-08ER46544 (JHU), and the NSF, Div. of Mater. Res., Sol. St. Chem., CAREER grant No. DMR-1253562 (JHU).

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Authors

  • Artem Akopyan

    • University of Miami

  • Narayan Prasai

    • Department of Physics, University of Miami
    • University of Miami

  • Sunxiang Huang

    • University of Miami

  • Joshua L. Cohn

    • Department of Physics, University of Miami
    • University of Miami

  • Benjamin Trump

    • Johns Hopkins University

  • Guy G. Marcus

    • IQM at JHU
    • Johns Hopkins University

  • Tyrel McQueen

    • Johns Hopkins University
    • Johns Hopkins Univ
    • Johns Hopkins University, Baltimore, USA