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.
@article{arxiv.1904.09009,
title = {Electrical control of magnetization in S/F/S junctions on a 3D topological insulator},
author = {M. Nashaat and I. V. Bobkova and A. M. Bobkov and Yu. M. Shukrinov and I. R. Rahmonov and K. Sengupta},
journal= {arXiv preprint arXiv:1904.09009},
year = {2019}
}