6533b830fe1ef96bd1297c13
RESEARCH PRODUCT
Three-dimensional dynamics of a particle with a finite energy of magnetic anisotropy in a rotating magnetic field.
Andrejs CebersJanis Cimurssubject
PhysicsRotating magnetic fieldMagnetic anisotropyNuclear magnetic resonanceCondensed matter physicsMagnetic energyDemagnetizing fieldField strengthMagnetic pressureMagnetic dipoleMagnetosphere particle motiondescription
A model of a single ferromagnetic particle with a finite coupling energy of the magnetic moment with the body of the particle is formulated, and regimes of its motion in a rotating magnetic field are investigated. Regimes are possible that are synchronous and asynchronous with the field. In a synchronous regime the easy axis of the particle is in the plane of the rotating magnetic field at low frequencies (a planar regime) and on the cone at high frequencies (a precession regime). The stability of these regimes is investigated, and it is shown that the precession regime is stable for field strengths below the critical value. In a particular range of field strength value, irreversible jumps of the magnetic moment take place in the asynchronous planar regime. The stability of this regime is investigated, and it is shown that it is stable for field strengths above the critical value, which depends on the frequency. The implications of these results for the energy dissipation in a rotating field are analyzed, and it is shown that the maximum of the heat production near the transition to the synchronous regime is flattened out by the transition to the precession regime.
year | journal | country | edition | language |
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2013-10-02 | Physical review. E, Statistical, nonlinear, and soft matter physics |