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Spin Hall Angle Quantification from Spin Pumping and Microwave Photoresistance

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arxiv 1203.6175 v1 pith:GNOTN6V5 submitted 2012-03-28 cond-mat.mes-hall cond-mat.mtrl-sci

Z. Feng , J. Hu , L. Sun , B. You , D. Wu , J. Du , W. Zhang , A. Hu
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Y. Yang D. M. Tang B. S. Zhang H. F. Ding
This is my paper · ORCID
classification cond-mat.mes-hallcond-mat.mtrl-sci
keywords spinmicrowavehallmethodphotoresistanceangleishemeasurements
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We present a method to quantify the spin Hall angle (SHA) with spin pumping and microwave photoresistance measurements. With this method, we separate the inverse spin Hall effect (ISHE) from other unwanted effects for permalloy/Pt bilayers using out-of-plane microwave excitation. Through microwave photoresistance measurements, the in- and out-of-plane precessing angles of the magnetization are determined and enabled for the exact determination of the injected pure spin current. This method is demonstrated with an almost perfect Lorentz line-shape for the obtained ISHE signal and the frequency independent SHA value as predicted by theory. By varying the Pt thickness, the SHA and spin-diffusion length of Pt is quantified as 0.012 (0.001) and 8.3 (0.9) nm, respectively.

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