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Magnetic skyrmion interactions in the micromagnetic framework

DOI: 10.1103/PhysRevB.101.134422 DOI Help

Authors: R. Brearton (University of Oxford; Diamond Light Source) , G. Van Der Laan (Diamond Light Source) , T. Hesjedal (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 101 , PAGES 134422

State: Published (Approved)
Published: April 2020

Abstract: Magnetic skyrmions are localized swirls of magnetization with a nontrivial topological winding number. This winding increases their robustness to superparamagnetism and gives rise to a myriad of novel dynamical properties, making them attractive as next-generation information carriers. Recently the equation of motion for a skyrmion was derived using the approach pioneered by Thiele, allowing for macroscopic skyrmion systems to be modeled efficiently. This powerful technique suffers from the prerequisite that one must have a priori knowledge of the functional form of the interaction between a skyrmion and all other magnetic structures in its environment. Here we attempt to alleviate this problem by providing a simple analytic expression that can generate arbitrary repulsive interaction potentials from the micromagnetic Hamiltonian, using it to provide a correction to the interaction between a skyrmion and the boundary of its material. We also discuss a toy model of the radial profile of a skyrmion, which is accurate for a wide range of material parameters.

Journal Keywords: skyrmions, magnetism, magnetic modelling

Diamond Keywords: Skyrmions

Subject Areas: Physics, Materials

Technical Areas: Theoretical Physics

Added On: 30/06/2020 09:29

Discipline Tags:

Quantum Materials Hard condensed matter - electronic properties Physics Magnetism Materials Science

Technical Tags: