Interaction of a nanomagnet with a weak superconducting link

Liufei Cai; E. M. Chudnovsky

doi:10.1103/PhysRevB.82.104429

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Interaction of a nanomagnet with a weak superconducting link

Liufei Cai, E. M. Chudnovsky

DOI 10.1103/PhysRevB.82.104429 · Physical Review B

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Abstract

We study electromagnetic interaction of a nanomagnet with a weak superconducting link. Equations that govern coupled dynamics of the two systems are derived and investigated numerically. We show that the presence of a small magnet in the proximity of a weak link may be detected through Shapiro-type steps caused by the precession of the magnetic moment. Despite very weak magnetic field generated by the weak link, a time-dependent bias voltage applied to the link can initiate a nonlinear dynamics of the nanomagnet that leads to the reversal of its magnetic moment. We also consider quantum problem in which a nanomagnet interacting with a weak link is treated as a two-state spin system due to quantum tunneling between spin-up and spin-down states.