中国物理学会期刊网
Chin. Phys. Lett.  2018, Vol.35 Issue (7): 077401  DOI:10.1088/0256-307X/35/7/077401
Possible Evidence for Spin-Transfer Torque Induced by Spin-Triplet Supercurrents
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 1001902King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia3School of Physical Science, University of Chinese Academy of Sciences, Beijing 100190>

Abstract

The mutual interplay between superconductivity and magnetism in superconductor/ferromagnet heterostructures may give rise to unusual proximity effects beyond current knowledge. Especially, spin-triplet Cooper pairs could be created at carefully engineered superconductor/ferromagnet interfaces. Here we report a giant proximity effect on spin dynamics in superconductor/ferromagnet/superconductor Josephson junctions. Below the superconducting transition temperature $T_{\rm C}$, the ferromagnetic resonance field at X-band ($\sim$9.0?GHz) shifts rapidly to a lower field with decreasing temperature. In strong contrast, this phenomenon is absent in ferromagnet/superconductor bilayers and superconductor/insulator/ferromagnet/superconductor multilayers. Such an intriguing phenomenon can not be interpreted by the conventional Meissner effect. Instead, we propose that the strong influence on spin dynamics could be due to spin-transfer torque associated with spin-triplet supercurrents in ferromagnetic Josephson junctions with precessing magnetization.
收稿日期:2018-06-21

基金资助

Supported by the National Natural Science Foundation of China under Grant Nos 51725104 and 11534015, and the National Key Research and Development Program of China under Grant No 2016YFA0300700. Y.S. also acknowledges the support from Chinese Academy of Sciences under Grant No XDB07030200.

引用本文

[英文]
Lai-Lai Li, Yue-Lei Zhao, Xi-Xiang Zhang, Young Sun. Possible Evidence for Spin-Transfer Torque Induced by Spin-Triplet Supercurrents[J]. CPL, 2018, 35(7): 077401.
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