Disordered skyrmion phase stabilized by magnetic frustration in a chiral magnet

Abstract

Magnetic skyrmions are vortex-like topological spin textures often observed to form a triangular-lattice skyrmion crystal in structurally chiral magnets with Dzyaloshinskii-Moriya interaction. Recently $\beta$-Mn structure-type Co-Zn-Mn alloys were identified as a new class of chiral magnet to host such skyrmion crystal phases, while $\beta$-Mn itself is known as hosting an elemental geometrically frustrated spin liquid. Here we report the intermediate composition system Co${}_7$Zn${}_7$Mn${}_6$ to be a unique host of two disconnected, thermal-equilibrium topological skyrmion phases; one is a conventional skyrmion crystal phase stabilized by thermal fluctuations and restricted to exist just below the magnetic transition temperature $T_{\mathrm{c}}$, and the other is a novel three-dimensionally disordered skyrmion phase that is stable well below $T_{\mathrm{c}}$. The stability of this new disordered skyrmion phase is due to a cooperative interplay between the chiral magnetism with Dzyaloshinskii-Moriya interaction and the frustrated magnetism inherent to $\beta$-Mn.

57 pages, 16 figures

References in corpus (6)

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• Twist automorphisms and Poisson structures
• Semi-toric degenerations of Richardson varieties arising from cluster structures on flag varieties