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Theory of magnetic skyrmion glass | | Shintaro Hoshino
; Naoto Nagaosa
; | | Date: |
28 Dec 2017 | | Abstract: | Skyrmions and skyrmion crystal (SkX) discovered in chiral magnets show unique
physical properties due to their nontrivial topology such as the stability
against the annihilation and the motion driven by the ultralow current density,
which can be advantageous for the device applications such as magnetic
memories. Especially, the chiral dynamics, i.e., the velocity perpendicular to
the force acting on a skyrmion, is a key to avoid the impurity potential and
enhances its mobility. However, the collective pinning of SkX occurs by the
disorder, which is crucial for its low energy properties. Here, we study
theoretically the low energy dynamics of SkX in the presence of disorder
effects in terms of replica field theory, and reveal nonreciprocal collective
modes and their electromagnetic responses along the direction of external
magnetic field. The physical quantities such as the relaxation rate of
$mu$SR/NMR and the pinning frequency show a dramatic change associated with
the topological phase transition from the helical state to SkX. These results
provide a firm basis to explore the glassy state of SkX. | | Source: | arXiv, 1712.9782 | | Services: | Forum | Review | PDF | Favorites | |
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