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Keywords:

  • Spin coherent states;
  • storage;
  • microwave field;
  • magnetic nanodots.

Abstract

We study the coherent state excitation of spins in square nanodots induced by a magnetic microwave field. We present a new mechanism of spin reversal in nanodots. That is, the microwave field directly induces the reversal of the coherent-state spins instead of indirectly through the magnetic vortex. We obtain the space distribution of coherent-state spins in terms of a quantum theory, and calculate the time of spin reversal. This spin-reversal process may be used to serve as a storage mechanism of binary information.