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Unity spin Hall ratio in NixCu1-x alloys (Conference Presentation)
Author(s): Mark Keller; Monika Arora; Justin Shaw; Tom Silva

Paper Abstract

We have measured a spin Hall conductivity in Ni60Cu40 that is comparable to the value we reported for Pt [1], using broadband FMR measurements of ferromagnet/nonmagnet bilayers that do not require patterning of the bilayer. In a series of samples with the layer structure Ta(3)/Py(3.5)/NixCu1-x(d)/Ta(3) (thickness in nm), we varied Ni fraction x for d = 10 nm and varied thickness d for x = 0.6, a composition with a critical temperature for magnetic ordering of 140 K. FMR measurements at room temperature showed a substantial SHE for all compositions we deposited, 0.3 ≤ x ≤ 0.75. For the thickness series at x = 0.6, we use the approach detailed in [1] to extract a spin diffusion length of (8.3 ± 0.4) nm and a spin Hall ratio of 1.05 ± 0.22. [1] Berger, A. J., et al. "Determination of the spin Hall effect and the spin diffusion length of Pt from self-consistent fitting of damping enhancement and inverse spin-orbit torque measurements" Phys. Rev. B 98, 024402 (2018).

Paper Details

Date Published: 10 September 2019
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Proc. SPIE 11090, Spintronics XII, 1109032 (10 September 2019); doi: 10.1117/12.2530345
Show Author Affiliations
Mark Keller, National Institute of Standards and Technology (United States)
Monika Arora, National Institute of Standards and Technology (United States)
Justin Shaw, National Institute of Standards and Technology (United States)
Tom Silva, National Institute of Standards and Technology (United States)


Published in SPIE Proceedings Vol. 11090:
Spintronics XII
Henri-Jean M. Drouhin; Jean-Eric Wegrowe; Manijeh Razeghi, Editor(s)

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