Einstein-de Haas Nanorotor

Authors:
  • WIW. Izumida
    W. Izumida
  • ROR. Okuyama
    R. Okuyama
  • KSK. Sato
    K. Sato
  • TKT. Kato
    T. Kato
  • MMM. Matsuo
    M. Matsuo
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Abstract
We propose a nanoscale rotor embedded between two ferromagnetic electrodes as a prototype of a nanorotor driven by spin injection. The spin-rotation coupling allows this nanorotor to continuously receive angular momentum from an injected spin under steady current flow between ferromagnetic electrodes with antiparallel magnetization configuration. We develop a quantum theory for a microscopic mechanism of this angular momentum transfer and show that a relaxation process from a precession state into a sleeping top state is crucial for the efficient driving of the nanorotor by solving the Master equation. Our work clarifies a general strategy for the efficient driving of a nanorotor.