Magnetization switching in a Heisenberg model for small ferromagnetic particles

Hinzke, Denise; Nowak, Ulrich

Magnetization switching in a Heisenberg model for small ferromagnetic particles

Dateien

Hinzke_1998_MagnetizationSwitching.pdfGröße: 192.84 KBDownloads: 181

Datum

1998

Publikationstyp

Zeitschriftenartikel

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Physical Review B. 1998, 58(1), pp. 265-272. Available under: doi: 10.1103/PhysRevB.58.265

Zusammenfassung

We investigate the thermally activated magnetization switching of small ferromagnetic particles driven by an external magnetic field. For low uniaxial anisotropy the spins can be expected to rotate coherently, while for sufficient large anisotropy they should behave Ising-like, i.e., the switching should then be due to nucleation. We study this crossover from coherent rotation to nucleation for a classical three-dimensional Heisenberg model with finite anisotropy. The crossover is influenced by the size of the particle, the strength of the driving magnetic field, and the anisotropy. We discuss the relevant energy barriers which have to be overcome during the switching, and find theoretical arguments which yield the energetically favorable reversal mechanisms for given values of the quantities above. The results are confirmed by Monte Carlo simulations of Heisenberg and Ising models.

Fachgebiet (DDC)

530 Physik

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ISO 690

HINZKE, Denise, Ulrich NOWAK, 1998. Magnetization switching in a Heisenberg model for small ferromagnetic particles. In: Physical Review B. 1998, 58(1), pp. 265-272. Available under: doi: 10.1103/PhysRevB.58.265

BibTex

@article{Hinzke1998Magne-9133,
  year={1998},
  doi={10.1103/PhysRevB.58.265},
  title={Magnetization switching in a Heisenberg model for small ferromagnetic particles},
  number={1},
  volume={58},
  journal={Physical Review B},
  pages={265--272},
  author={Hinzke, Denise and Nowak, Ulrich}
}

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