Magnetoanisotropic Josephson effect due to interfacial spin-orbit fields in superconductor/ferromagnet/superconductor junctions

Article

关键词: SUPERCONDUCTOR-FERROMAGNET STRUCTURES;    ANDREEV REFLECTION;    MAJORANA FERMIONS;    SPINTRONICS;    HETEROSTRUCTURES;    NANOWIRE;    SUPERCURRENTS;    CIRCUITS;    PHASE;   

DOI  :  10.1103/PhysRevB.95.024514

来源: SCIE

【 摘 要 】

We study theoretically the effects of interfacial Rashba and Dresselhaus spin-orbit coupling in superconductor/ ferromagnet/superconductor (S/F/S) Josephson junctions-with allowing for tunneling barriers between the ferromagnetic and superconducting layers-by solving the Bogoljubov-de Gennes equation for realistic heterostructures and applying the Furusaki-Tsukada technique to calculate the electric current at a finite temperature. The presence of spin-orbit couplings leads to out-of-plane and in-plane magnetoanisotropies of the Josephson current, which are giant in comparison to current magnetoanisotropies in similar normal-state ferromagnet/normal metal (F/N) junctions. Especially huge anisotropies appear in the vicinity of 0-pi transitions, caused by the exchange-split bands in the ferromagnetic metal layer. We also show that the direction of the Josephson critical current can be controlled (inducing 0-pi transitions) by the strength of the spin-orbit coupling and, more crucial, by the orientation of the magnetization. Such a control can bring new functionalities into Josephson junction devices.

【 授权许可】

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