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10 September 2019 Unity spin Hall ratio in NixCu1-x alloys (Conference Presentation)
Mark Keller, Monika Arora, Justin Shaw, Tom Silva
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Proceedings Volume 11090, Spintronics XII; 1109032 (2019) https://doi.org/10.1117/12.2530345
Event: SPIE Nanoscience + Engineering, 2019, San Diego, California, United States
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).
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Mark Keller, Monika Arora, Justin Shaw, and Tom Silva "Unity spin Hall ratio in NixCu1-x alloys (Conference Presentation)", Proc. SPIE 11090, Spintronics XII, 1109032 (10 September 2019); https://doi.org/10.1117/12.2530345
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KEYWORDS
Diffusion
Platinum
Temperature metrology
Magnetism
Nickel
Optical lithography
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