Kapitza pendulum effects in a Josephson junction coupled to a nanomagnet under external periodic drive

K. V. Kulikov; D. V. Anghel; A. T. Preda; M. Nashaat; M. Sameh; Yu. M. Shukrinov

doi:10.1103/PhysRevB.105.094421

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Kapitza pendulum effects in a Josephson junction coupled to a nanomagnet under external periodic drive

K. V. Kulikov, D. V. Anghel, A. T. Preda, M. Nashaat, M. Sameh, Yu. M. Shukrinov

DOI 10.1103/PhysRevB.105.094421 · Physical Review B

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Abstract

We investigate reorientation effects under external periodic drive in the nanomagnet dynamics coupled to a Josephson junction. The Kapitza pendulum is introduced as a mechanical analog to this system and we demonstrate the reorientation of the easy axis of the nanomagnet. The magnetic field generated by the Josephson junction and external drive plays the role of the oscillating force of the suspension point in the Kapitza pendulum. The high-frequency oscillations change the orientation of the magnetic moment. The magnetic field of the quasiparticle current determines the frequency dependence of the magnetic moment's orientation. We obtain simple analytical formulas for the stable position of the magnetic moment, both under the external periodic drive and without it. The influence of external periodic drive on the voltage of complete reorientation have been demonstrated.