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arXiv · 1807.11550

Duplication, collapse and escape of magnetic skyrmions revealed using a systematic saddle point search method

Gideon P. Müller·Pavel F. Bessarab·Sergei M. Vlasov·Fabian R. Lux·Nikolai S. Kiselev·Stefan Blügel·Valery M. Uzdin·Hannes Jónsson
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Abstract

Various transitions that a magnetic skyrmion can undergo are found in calculations using a method for climbing up the energy surface and converging onto first order saddle points. In addition to collapse and escape through a boundary, the method identifies a transition where the skyrmion divides and forms two skyrmions. The activation energy for this duplication process can be similar to that of collapse and escape. A tilting of the external magnetic field for a certain time interval is found to induce the duplication process in a dynamical simulation. Such a process could turn out to be an important avenue for the creation of skyrmions in future magnetic devices.

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Gideon P. Müller, Pavel F. Bessarab, Sergei M. Vlasov, Fabian R. Lux, Nikolai S. Kiselev, Stefan Blügel, Valery M. Uzdin, Hannes Jónsson. 2018-08-03. Duplication, collapse and escape of magnetic skyrmions revealed using a systematic saddle point search method. https://doi.org/10.1103/physrevlett.121.197202

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