Ginzburg-Landau theory for skyrmions in inversion-symmetric magnets with competing interactions
By Shizeng Lin, S. Hayami. 2015
183 citations recorded by the source corpus.
Magnetic skyrmions have attracted considerable attention recently for their huge potential in spintronic applications. Generally skyrmions are big compared to the atomic lattice constant, which allows for the Ginzburg-Landau type description in the continuum limit. This description successfully captures the main experimental observations on skyrmions in B20 compound without inversion symmetry. Skyrmions can also exist in inversion-symmetric magnets with competing interactions. Here, we derive a general Ginzburg-Landau theory for skyrmions in these magnets valid in the long-wavelength limit. We study the unusual static and dynamical properties of skyrmions based on the derived Ginzburg-Landau theory. We show that an easy axis spin anisotropy is sufficient to stabilize a skyrmion lattice. Interestingly, the skyrmion in inversion-symmetric magnets has a new internal degree of freedom associated with the rotation of helicity, i.e., the “spin” of the skyrmion as a particle, in addition to the usual translational motion of skyrmions (orbital motion). The orbital and spin degree of freedoms of an individual skyrmion can couple to each other, and give rise to unusual behavior that is absent for the skyrmions stabilized by the Dzyaloshinskii-Moriya interaction. Finally, the derived Ginzburg-Landau theory provides a convenient and general framework to discuss skyrmion physics and will facilitate themore » search for skyrmions in inversion-symmetric magnets.« less
Subfields: Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/021b60c3e62b605969f86766bed5efbdd7a4035b
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In Atomic and Molecular Physics, and Optics
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Citations in the corpus
- Skyrmion-electronics: writing, deleting, reading and processing magnetic skyrmions toward spintronic applications (2019, background): “Namely, the skyrmion energy in frustrated magnets can be irrespective to the skyrmion helicity [301].”
- Skyrmions in magnetic multilayers (2017, background): “Beyond stabilization of magnetic skyrmions by antisymmetric DMI, other exotic mechanisms such as four-spin interaction [124], and frustrated exchange interaction [125-127] and nonmagnetic impurities [128, 129] have also been proposed.”