Bolometric ferromagnetic resonance techniques for characterising spin-Hall effect at high temperatures

P. Phu, K. Yamanoi, K. Ohnishi, J. Hyodo, K. Rogdakis, Y. Yamazaki, T. Kimura, H. Kurebayashi

Research output: Contribution to journalArticle

Abstract

We report on current-induced ferromagnetic resonance techniques to characterise spin-Hall effect at high temperatures. A microwave current was injected into a patterned CoFeB/Pt bi-layer grown on a glass substrate, simultaneously exerting spin-transfer torques through the spin-Hall effect and also causing Joule heating enabling the control of the device temperature. We measured the device temperature by using the device itself as a local temperature sensor. A clear reduction of CoFeB magnetisation was observed as the device temperature was increased allowing us to estimate the Curie temperature of our CoFeB film to be 920 K. The spin-Hall angle of Pt was quantified as (1.72 ± 0.03) × 10−2 at 300 K and was slightly increased to (1.75 ± 0.02) × 10−2 at 410 K. This simple method can be widely used for quantifying the spin-Hall angle of a large variety of materials at high temperatures.

Original languageEnglish
Pages (from-to)304-307
Number of pages4
JournalJournal of Magnetism and Magnetic Materials
Volume485
DOIs
Publication statusPublished - 2019 Sep 1

Keywords

  • High-temperature-measurement
  • Magnetisation dynamics
  • Spin-Hall-angle
  • Spin-transfer-torque

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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