周期驱动下约瑟夫森结+纳米磁体中的Kapitsa摆效应
Kapitsa pendulum effects in Josephson junction + nanomagnet under external periodic drive
摘要：
我们研究了耦合到约瑟夫森结的纳米磁体动力学中在外部周期驱动下的重取向效应。Kapitsa摆作为一个机械模拟引入到这个系统中，我们证明了纳米磁体的易轴的重新取向。由约瑟夫森结和外部驱动产生的磁场在卡皮察摆中起着悬点振荡力的作用。高频振荡改变了磁矩的方向。准粒子电流的磁场决定了磁矩取向的频率依赖性。得到了有无外加周期驱动时磁矩稳定位置的简单解析公式，并论证了外加周期驱动对完全重取向电压的影响。
英文摘要：
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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