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

Phu, P; Yamanoi, K; Ohnishi, K; Hyodo, J; Rogdakis, K; Yamazaki, Y; Kimura, T; (2019) Bolometric ferromagnetic resonance techniques for characterising spin-Hall effect at high temperatures. Journal of Magnetism and Magnetic Materials , 485 pp. 304-307. 10.1016/j.jmmm.2019.04.070.

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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.

Type: Article
Title: Bolometric ferromagnetic resonance techniques for characterising spin-Hall effect at high temperatures
DOI: 10.1016/j.jmmm.2019.04.070
Publisher version: https://doi.org/10.1016/j.jmmm.2019.04.070
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Magnetisation dynamics, Spin-transfer-torque, Spin-Hall-angle, High-temperature-measurement
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/10077534
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