Resonant suppression of thermal stability of the nanoparticle magnetization by a rotating magnetic field
| Autor: | Denisov, S. I., Polyakov, A. Yu., Lyutyy, T. V. |
|---|---|
| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 84, 124410 (2011) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.84.174410 |
| Popis: | 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. Comment: 28 pages, 10 figures |
| Databáze: | arXiv |
| Externí odkaz: |
|