Transitions between skyrmion- and hedgehog-lattice states in cubic chiral magnets MnSi1-xGex

Topological spin textures such as magnetic skyrmions and spin hedgehogs show novel emergent phenomena, which can be exploited for spintronic functionalities. Whereas the formation or deletion of them has been intensively studied so far, switching of spin textures among different topologically-nontrivial classes remains largely unexplored.
We report on transitions between skyrmion- and hedgehog-lattice states in cubic chiral magnets MnSi_1-xGe_xwith variation of lattice constant controlled by Si/Ge substitution. By combining neutron scattering, Lorentz transmission electron microscopy and high-field transport measurements, we observe three different topological spin textures: skyrmion lattice in x = 0-0.25 as well as two distinct hedgehog lattices in x = 0.3-0.7 and x = 0.8-1, as respectively characterized by large topological Hall effects.
The emergence of various topological spin states in the chemical-pressure-controlled materials suggests a new route for direct manipulation of the spin-texture topology by a simple mechanical method such as pressure.

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Bulletin of the American Physical Society

APS March Meeting 2019

Volume 64, Number 2

Monday–Friday, March 4–8, 2019; Boston, Massachusetts

Session H41: Skyrmion Crystals

Abstract: H41.00005 : Transitions between skyrmion- and hedgehog-lattice states in cubic chiral magnets MnSi1-xGex

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Abstract: H41.00005 : Transitions between skyrmion- and hedgehog-lattice states in cubic chiral magnets MnSi_1-xGe_x