Einstein–de Haas Nanorotor

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Abstract
We propose a nanoscale rotor embedded between two ferromagnetic electrodes that is 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 in an antiparallel magnetization configuration. We develop a quantum theory 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 efficient driving of a nanorotor.
Funding Information
  • Japan Society for the Promotion of Science (JP16H01046, JP18H04282, JP19K14637, JP20K03831, JP20H01863, JP20K05258, JP21K03414)
  • Chinese Academy of Sciences (XDB28000000)

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