Magnetization reversal condition for a nanomagnet within a rotating magnetic field

Tomohiro Taniguchi
Phys. Rev. B 90, 024424 – Published 25 July 2014

Abstract

The reversal condition of magnetization in a nanomagnet under the effect of rotating magnetic field generated by a microwave is theoretically studied based on the Landau-Lifshitz-Gilbert equation. In a rotating frame, the microwave produces a dc magnetic field pointing in the reversed direction, which energetically stabilizes the reversed state. We find that the microwave simultaneously produces a torque preventing the reversal. It is pointed out that this torque leads to a jump in the reversal field with respect to the frequency. We derive the equations determining the reversal fields in both the low- and high-frequency regions from the energy balance equation. The validities of the formulas are confirmed by a comparison with the numerical simulation of the Landau-Lifshitz-Gilbert equation.

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  • Received 29 January 2014
  • Revised 30 June 2014

DOI:https://doi.org/10.1103/PhysRevB.90.024424

©2014 American Physical Society

Authors & Affiliations

Tomohiro Taniguchi

  • National Institute of Advanced Industrial Science and Technology (AIST), Spintronics Research Center, Tsukuba, Ibaraki 305-8568, Japan

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Issue

Vol. 90, Iss. 2 — 1 July 2014

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