Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 33, Issue 44, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-648X/ac1a30
Keywords
skyrmion crystal; topological magnetism; itinerant magnet; itinerant frustration; multiple-Q magnetic order; RKKY interaction; biquadratic spin interactions
Categories
Funding
- JSPS KAKENHI [JP18K13488, JP19K03752, JP19H01834, JP19H05825, JP21H01037]
- JST PRESTO [JPMJPR20L8]
- JST CREST [JP-MJCR18T2]
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This paper reviews new types of topological spin textures in itinerant magnets, focusing on their stabilization mechanisms. By analyzing the interplay between charge and spin degrees of freedom, it is demonstrated that itinerant frustration plays a central role in stabilizing various topological spin crystals.
Spin textures with nontrivial topology, such as vortices and skyrmions, have attracted attention as a source of unconventional magnetic, transport, and optical phenomena. Recently, a new generation of topological spin textures has been extensively studied in itinerant magnets; in contrast to the conventional ones induced, e.g., by the Dzyaloshinskii-Moriya interaction in noncentrosymmetric systems, they are characterized by extremely short magnetic periods and stable even in centrosymmetric systems. Here we review such new types of topological spin textures with particular emphasis on their stabilization mechanism. Focusing on the interplay between charge and spin degrees of freedom in itinerant electron systems, we show that itinerant frustration, which is the competition among electron-mediated interactions, plays a central role in stabilizing a variety of topological spin crystals including a skyrmion crystal with unconventional high skyrmion number, meron crystals, and hedgehog crystals. We also show that the essential ingredients in the itinerant frustration are represented by bilinear and biquadratic spin interactions in momentum space. This perspective not only provides a unified understanding of the unconventional topological spin crystals but also stimulates further exploration of exotic topological phenomena in itinerant magnets.
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