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Fast Vortex Core Switching at Moderate Temperatures

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2015

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http://nbn-resolving.de/urn:nbn:de:bsz:352-0-288811
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https://doi.org/10.12693/APhysPolA.127.342
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Acta Physica Polonica A. 2015, 127(2), pp. 342-344. ISSN 0587-4246. eISSN 1898-794X. Available under: doi: 10.12693/APhysPolA.127.342

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Ferromagnetic vortex core switching is investigated using micromagnetic simulations. For that the OOMMF program is used together with a temperature extension we have developed recently. This is a continuum micromagnetic approach, where the well-known Landau-Lifshitz-Gilbert equation (valid for zero temperature) is replaced by the Landau-Lifshitz-Bloch equation. In our research we simulate switching of a ferromagnetic vortex core in a flat disk (diameter 200 nm, thickness 20 nm) with material parameters that resemble permalloy. Temperatures in the range 400 K to 700 K are considered. Switching itself is caused by application of a very short oscillating magnetic pulse. Parameters used resemble conditions met in the experiment: oscillation period 141 ps (equal to the peak width) and amplitude 60 mT. Surprisingly, no large temperature- or discretization dependence is found. Reasons for that are discussed.

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ISO 690LEBECKI, Krzysztof, Ulrich NOWAK, 2015. Fast Vortex Core Switching at Moderate Temperatures. In: Acta Physica Polonica A. 2015, 127(2), pp. 342-344. ISSN 0587-4246. eISSN 1898-794X. Available under: doi: 10.12693/APhysPolA.127.342
BibTex
@article{Lebecki2015Vorte-31428,
  year={2015},
  doi={10.12693/APhysPolA.127.342},
  title={Fast Vortex Core Switching at Moderate Temperatures},
  number={2},
  volume={127},
  issn={0587-4246},
  journal={Acta Physica Polonica A},
  pages={342--344},
  author={Lebecki, Krzysztof and Nowak, Ulrich}
}
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