Magnetization reversal by tuning Rashba spin-orbit interaction and Josephson phase in a ferromagnetic Josephson junction.
We theoretically study the magnetization inside a normal metal containing the Rashba spinorbit interaction (RSOI) induced by the proximity effect in an s-wave superconductor/normal metal /ferromagnetic metal/s-wave superconductor (S/N/F/S) Josephson junction. By solving linearized Usadel equation taking into account of the RSOI, we show that the magnetization appears inside the N due to the proximity effect. The source of magnetization induced by the proximity effect is the odd-frequency spin-triplet Cooper pair(STC) inside the N. This result shows that the magnetization induced by the proximity effect is a good fingerprint to detect spins of STC. We find that the magnetization inside the N shows a damped oscillatory behavior as a function of the thickness of N for finite RSOI. The period of oscillation in the magnetization depends on the magnitude of RSOI. Due to the damped oscillatory behavior and the dependence of RSOI of the magnetization, the direction of the magnetization can be reversed by tuning the RSOI. Moreover, we also find that the direction of the magnetization inside the N can be reversed by changing superconducting phase difference, i.e., Josephson phase. From these results, it is expected that the magnetization depending on the RSOI and Josephson phase can be applicable to superconducting spintronics.
Publisher URL: http://arxiv.org/abs/1801.09559
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