Resonant suppression of thermal stability of the nanoparticle magnetization by a rotating magnetic field

Details Resonant suppression of thermal stability of the nanoparticle magnetization by a rotating magnetic field Resonant suppression of thermal stability of the nanoparticle magnetization by a rotating magnetic field

2011-08-17

arxiv.org/abs/1108.3559v2

Phys. Rev. B 84, 124410 (2011)

Physics

Condensed Matter

Statistical Mechanics

28 pages, 10 figures

Scientific paper

10.1103/PhysRevB.84.174410

We study the thermal stability of the periodic (P) and quasi-periodic (Q) precessional modes of the nanoparticle magnetic moment induced by a rotating magnetic field. An analytical method for determining the lifetime of the P mode in the case of high anisotropy barrier and small amplitudes of the rotating field is developed within the Fokker-Planck formalism. In general case, the thermal stability of both P and Q modes is investigated by numerical simulation of the stochastic Landau-Lifshitz equation. We show analytically and numerically that the lifetime is a nonmonotonic function of the rotating field frequency which, depending on the direction of field rotation, has either a pronounced maximum or a deep minimum near the Larmor frequency.

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