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arXiv 1610.02759cond-mat.mes-hallcond-mat.mtrl-sci
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驱动场幅值计量的定量反自旋霍尔效应检测

Driving field amplitude gauged quantitative inverse spin Hall effect detection

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

摘要:

薄膜材料中的自旋输运可以通过铁磁共振(FMR)驱动的无电荷自旋电流的自旋泵浦来研究,所述无电荷自旋电流通过逆自旋霍尔效应(ISHE)感应电动势。对于定量ISHE实验,FMR驱动场幅度$B_1$的精确控制是至关重要的。本研究利用电子顺磁共振(EPR)诱导的顺磁分子(α,γ-双二亚苯基-β-苯基烯丙基和苯的1:1复合物,BDPA)的瞬态章动作为$B_1$探针放置在NiFe/Pt基ISHE装置附近,利用原位监测$B_1$。与ISHE实验同时进行,从感应测量的BDPA拉比章动频率获得$B_1$。通过将ISHE电压重整为$B_1^2$,实现了更高的再现性,其精度由FMR驱动场的均匀性确定,因此由所施加的微波谐振器和ISHE设备设置确定。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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