Skyrmions in an oblique field

•We are proposing a novel binary and quaternary memory for a 2D magnetic element.•The memory is based upon two or four spatially separated stable states of skyrmions.•Computations with all relevant interactions are done for real material parameters.•The skyrmion states occur in the magnetic field ap...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2021-11, Vol.537 (C), p.168215, Article 168215
Main Authors: Capic, Daniel, Garanin, Dmitry A., Chudnovsky, Eugene M.
Format: Article
Language:English
Subjects:
Hypothetical particles
Magnetic islands
Particle theory
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Summary:•We are proposing a novel binary and quaternary memory for a 2D magnetic element.•The memory is based upon two or four spatially separated stable states of skyrmions.•Computations with all relevant interactions are done for real material parameters.•The skyrmion states occur in the magnetic field applied at an angle with the element.•The switching is achieved by the field gradient. The device can operate at 300 K. We study skyrmion states induced by the oblique field in a square magnetic island. To describe stable states and dynamics of the skyrmion, we employ the lattice model that accounts for all relevant interactions and uses parameters in the range of practical interest. Depending on the orientation of the field, two or four spatially separated energy minima emerge in the oblique field. The depth of the energy minima can be controlled by the strength and orientation of the magnetic field. We study the dynamics of the skyrmion and show that it can be moved between any two states by the field gradient. Possible applications for developing binary and quaternary skyrmion-based memory are discussed.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2021.168215