Interaction of a Nanomagnet with a Weak Superconducting Link

Details Interaction of a Nanomagnet with a Weak Superconducting Link Interaction of a Nanomagnet with a Weak Superconducting Link

2010-07-02

arxiv.org/abs/1007.0416v2

Physical Review B 82, 104429 (2010) [7 pages]

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 4 figures

Scientific paper

10.1103/PhysRevB.82.104429

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-like 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 non-linear 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.

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