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Ferromagnetic vortex core switching at elevated temperatures

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Lebecki_279140.pdf
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2014

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http://nbn-resolving.de/urn:nbn:de:bsz:352-279140
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https://doi.org/10.1103/PhysRevB.89.014421
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Physical Review B. 2014, 89(1). ISSN 1098-0121. eISSN 1095-3795. Available under: doi: 10.1103/PhysRevB.89.014421

Zusammenfassung

An approach for the investigation of vortex core switching is presented. Thermal effects up to the Curie point are included in a micromagnetic framework based on the recently developed Landau-Lifshitz-Bloch equation. In this approach it is easier to avoid numerical discretization artifacts, commonly present when a Bloch point is mediating the switching process. Switching in thin circular permalloy disks caused by the application of a slowly increasing magnetic field oriented orthogonally to the disk is considered. An energy barrier which can be overcome by thermal fluctuations is taken into account, leading to a strong influence of the temperature on the switching field. In particular, the switching field goes to zero at a significantly smaller temperature than the Curie temperature. The deduced nucleation volume is smaller than the typical grain size in permalloy.

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ISO 690LEBECKI, Krzysztof, Ulrich NOWAK, 2014. Ferromagnetic vortex core switching at elevated temperatures. In: Physical Review B. 2014, 89(1). ISSN 1098-0121. eISSN 1095-3795. Available under: doi: 10.1103/PhysRevB.89.014421
BibTex
@article{Lebecki2014Ferro-27914,
  year={2014},
  doi={10.1103/PhysRevB.89.014421},
  title={Ferromagnetic vortex core switching at elevated temperatures},
  number={1},
  volume={89},
  issn={1098-0121},
  journal={Physical Review B},
  author={Lebecki, Krzysztof and Nowak, Ulrich}
}
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