Possible Evidence for Spin-Transfer Torque Induced by Spin-Triplet Supercurrents

被引：33
|
作者：
Li, Lai-Lai [1 ,3 ]
Zhao, Yue-Lei [2 ]
Zhang, Xi-Xiang [2 ]
Sun, Young [1 ,3 ]
机构：
[1] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing 100190, Peoples R China
[2] KAUST, Thuwal 239556900, Saudi Arabia
[3] Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100190, Peoples R China
来源：
CHINESE PHYSICS LETTERS | 2018年 / 35卷 / 07期
基金：
中国国家自然科学基金;
关键词：
D O I：
10.1088/0256-307X/35/7/077401
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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-C, the ferromagnetic resonance field at X-band (similar to 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.
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页数：4
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