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Magnetic relaxation in a classical spin chain

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Physical Review B. 2000, 61(10), pp. 6734-6740. Available under: doi: 10.1103/PhysRevB.61.6734

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With decreasing particle size, different mechanisms dominate the thermally activated magnetization reversal in ferromagnetic particles. We investigate some of these mechanisms for the case of a classical Heisenberg spin chain driven by an external magnetic field. For sufficiently small system size the magnetic moments rotate coherently. With increasing size a crossover to a reversal due to soliton-antisoliton nucleation sets in. For even larger systems many of these soliton-antisoliton pairs nucleate at the same time. These effects give rise to a complex size dependence of the energy barriers and characteristic time scales of the relaxation. We study these quantities using Monte Carlo simulations as well as a direct integration of the Landau-Lifshitz-Gilbert equation of motion with Langevin dynamics and we compare our results with asymptotic solutions for the escape rate following from the Fokker-Planck equation. Also, we investigate the crossover from coherent rotation to soliton-antisoliton nucleation and multidroplet nucleation, especially its dependence on the system size, the external field, and the anisotropy of the system.

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ISO 690HINZKE, Denise, Ulrich NOWAK, 2000. Magnetic relaxation in a classical spin chain. In: Physical Review B. 2000, 61(10), pp. 6734-6740. Available under: doi: 10.1103/PhysRevB.61.6734
BibTex
@article{Hinzke2000Magne-5176,
  year={2000},
  doi={10.1103/PhysRevB.61.6734},
  title={Magnetic relaxation in a classical spin chain},
  number={10},
  volume={61},
  journal={Physical Review B},
  pages={6734--6740},
  author={Hinzke, Denise and Nowak, Ulrich}
}
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