Metallic glasses for spintronics: anomalous temperature dependence and giant enhancement of inverse spin Hall effect

Autor: Jiao, W., Hou, D. Z., Chen, C., Wang, H., Zhang, Y. Z., Tian, Y., Qiu, Z. Y., Okamoto, S., Watanabe, K., Hirata, A., Egami, T., Saitoh, E., Chen, M. W.
Rok vydání: 2018
Předmět:
Druh dokumentu: Working Paper
Popis: Spin-charge conversion via inverse spin Hall effect (ISHE) is essential for enabling various applications of spintronics. The spin Hall response usually follows a universal scaling relation with longitudinal electric resistivity and has mild temperature dependence because elementary excitations play only a minor role in resistivity and hence ISHE. Here we report that the ISHE of metallic glasses shows nearly two orders of magnitude enhancements with temperature increase from a threshold of 80-100 K to glass transition points. As electric resistivity changes only marginally in the temperature range, the anomalous temperature dependence is in defiance of the prevailing scaling law. Such a giant temperature enhancement can be well described by a two-level thermal excitation model of glasses and disappears after crystallization, suggesting a new mechanism which involves unique thermal excitations of glasses. This finding may pave new ways to achieve high spin-charge conversion efficiency at room and higher temperatures for spintronic devices and to detect structure and dynamics of glasses using spin currents.
Databáze: arXiv