Fast Vortex Core Switching at Moderate Temperatures


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LEBECKI, Kristof M., Ulrich NOWAK, 2015. Fast Vortex Core Switching at Moderate Temperatures. In: Acta Physica Polonica A. 127(2), pp. 342-344. ISSN 0587-4246. eISSN 1898-794X. Available under: doi: 10.12693/APhysPolA.127.342

@article{Lebecki2015Vorte-31428, title={Fast Vortex Core Switching at Moderate Temperatures}, year={2015}, doi={10.12693/APhysPolA.127.342}, number={2}, volume={127}, issn={0587-4246}, journal={Acta Physica Polonica A}, pages={342--344}, author={Lebecki, Kristof M. and Nowak, Ulrich} }

Fast Vortex Core Switching at Moderate Temperatures 2015 terms-of-use Lebecki, Kristof M. Lebecki, Kristof M. Nowak, Ulrich eng 2015-07-15T09:32:31Z Nowak, Ulrich Full Text PDF<br />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. 2015-07-15T09:32:31Z

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