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

Lai-Lai Li, Yue-Lei Zhao, Xixiang Zhang, Young Sun

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

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 C , the ferromagnetic resonance field at X-band (∼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.
Original languageEnglish (US)
Pages (from-to)077401
JournalChinese Physics Letters
Volume35
Issue number7
DOIs
StatePublished - Jul 6 2018

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