Configurational entropy of magnetic skyrmions as an ideal gas

Abstract

The study of thermodynamics of topological defects is an important challenge to understand their underlying physics. Among them, magnetic skyrmions have a leading role for their physical properties and potential applications in storage and neuromorphic computing. In this paper, the thermodynamic statistics of magnetic skyrmions is derived. It is shown that the skyrmion free energy can be modelled via a parabolic function and the diameters statistics obeys the Maxwell-Boltzmann distribution. This allows for making an analogy between the behavior of the distribution of skyrmion diameters statistics and the diluted gas Maxwell-Boltzmann molecules distribution at thermodynamical equilibrium. The calculation of the skyrmion configurational entropy, due to thermally-induced changes of size and shape of the skyrmion, is essential for the determination of thermal fluctuations of the skyrmion energy around its average value. These results can be employed to advance the field of skyrmionics.

Main text 26 pages and 6 figures. Supplementary Information 4 pages

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• Skyrmions as quasiparticles: free energy and entropy
• Thermal motion of skyrmion arrays in granular films
• Skyrmion Lattice Domain Formation in a Non-Flat Energy Landscape
• Many-particle Quantum Hydrodynamics of Spin-1 Bose-Einstein Condensates