Electrical control of magnetization in S/F/S junctions on a 3D topological insulator

Abstract

Strong dependence of the Josephson energy on the magnetization orientation in Josephson junctions with ferromagnetic interlayers and spin-orbit coupling opens a way to control magnetization by Josephson current or Josephson phase. Here we investigate the perspectives of magnetization control in superconductor/ferromagnet/superconductor (S/F/S) Josephson junctions on the surface of a 3D topological insulator hosting Dirac quasiparticles. Due to the spin-momentum locking of these Dirac quasiparticles a strong dependence of the Josephson current-phase relation on the magnetization orientation is realized. It is demonstrated that this can lead to splitting of the ferromagnet's easy-axis in the voltage driven regime. We show that such a splitting can lead to stabilization of an unconventional four-fold degenerate ferromagnetic state.

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• New Ideas in Constraining Nuclear Forces
• Magnetoelectric effects in Josephson junctions
• Thermal noise effects on the magnetization switching of a ferromagnetic anomalous Josephson junction
• Magnetization reversal in S/F/S Josephson junctions on a 3D topological insulator
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