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arXiv · 1610.02759

Driving field amplitude gauged quantitative inverse spin Hall effect detection

Marzieh Kavand·Chuang Zhang·Dali Sun·Hans Malissa·Zeev Valy Vardeny·Christoph Boehme
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Abstract

Spin transport in thin-film materials can be studied by ferromagnetic resonantly (FMR) driven spin pumping of a charge-free spin current which induces an electromotive force through the inverse spin Hall effect (ISHE). For quantitative ISHE experiments, precise control of the FMR driving field amplitude $B_1$ is crucial. This study exploits in situ monitoring of $B_1$ by utilization of electron paramagnetic resonantly (EPR) induced transient nutation of paramagnetic molecules (a 1:1 complex of α,γ-bisdiphenylene-β-phenylallyl and benzene, BDPA) placed as $B_1$ probe in proximity of a NiFe/Pt-based ISHE device. Concurrent to an ISHE experiment, $B_1$ is obtained from the inductively measured BDPA Rabi-nutation frequency. Higher reproducibility is achieved by renormalization of the ISHE voltage to $B_1^2$ with an accuracy that is determined by the homogeneity of the FMR driving field and thus by the applied microwave resonator and ISHE device setup.

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Marzieh Kavand, Chuang Zhang, Dali Sun, Hans Malissa, Zeev Valy Vardeny, Christoph Boehme. 2016-10-10. Driving field amplitude gauged quantitative inverse spin Hall effect detection. https://doi.org/10.1103/physrevb.95.161406

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