Kapitsa pendulum effects in Josephson junction + nanomagnet under external periodic drive

Abstract

We investigate reorientation effects under external periodic drive in the nanomagnet dynamics coupled to a Josephson junction. The Kapitsa 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 Kapitsa 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.

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Cited by in corpus (6)

• Bifurcation structure and chaos in nanomagnet coupled to Josephson junction
• Kapitza stabilization of quantum critical order
• Buzdin, Shapiro and Chimera Steps in ${\phi }_0$ Josephson Junctions. II. Bifurcation, Switching, and Hysteresis
• Resonance phenomena in a nanomagnet coupled to a Josephson junction under external periodic drive
• Optimal dynamical stabilization
• Nonlinear Optical Effects Due to Magnetization Dynamics In a Ferromagnet