We study theoretically a dynamics of φ0 junction with direct coupling between magnetic moment and Josephson current which shows features close to Kapitza pendulum. We have found that starting with oscillations along z-axis, the character of magnetization dynamics changes crucially and stable position of magnetic moment m is realized between z− and y-axes depending on parameters of the system. Changes in critical current and spin-orbit interaction lead to the different stability regions for magnetization. An excellent agreement between analytical and numerical results is obtained for low values of the Josephson to magnetic energy ratio.
@article{arxiv.1804.05391,
title = {Re-orientation of easy axis in $\varphi_0$ junction},
author = {Yu. M. Shukrinov and A. Mazanik and I. R. Rahmonov and A. E. Botha and A. Buzdin},
journal= {arXiv preprint arXiv:1804.05391},
year = {2018}
}