Precipitating Ordered Skyrmion Lattices from Helical Spaghetti

Abstract

Magnetic skyrmions have been the focus of intense research due to their potential applications in ultra-high density data and logic technologies, as well as for the unique physics arising from their antisymmetric exchange term and topological protections. In this work we prepare a chiral jammed state in chemically disordered (Fe, Co)Si consisting of a combination of randomly-oriented magnetic helices, labyrinth domains, rotationally disordered skyrmion lattices and/or isolated skyrmions. Using small angle neutron scattering, (SANS) we demonstrate a symmetry-breaking magnetic field sequence which disentangles the jammed state, resulting in an ordered, oriented skyrmion lattice. The same field sequence was performed on a sample of powdered Cu2OSeO3 and again yields an ordered, oriented skyrmion lattice, despite relatively non-interacting nature of the grains. Micromagnetic simulations confirm the promotion of a preferred skyrmion lattice orientation after field treatment, independent of the initial configuration, suggesting this effect may be universally applicable. Energetics extracted from the simulations suggest that approaching a magnetic hard axis causes the moments to diverge away from the magnetic field, increasing the Dzyaloshinskii-Moriya energy, followed subsequently by a lattice re-orientation. The ability to facilitate an emergent ordered magnetic lattice with long-range orientation in a variety of materials despite overwhelming internal disorder enables the study of skyrmions even in imperfect powdered or polycrystalline systems and greatly improves the ability to rapidly screen candidate skyrmion materials.

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Cited by in corpus (8)

• Statics and Dynamics of Skyrmions Interacting with Pinning: A Review
• Controlling Dzyaloshinskii-Moriya interactions in the skyrmion host candidates FePd${}_{1-x}$Pt${}_x$Mo${}_3$N
• Three-Dimensional Structure of Hybrid Magnetic Skyrmions Determined by Neutron Scattering
• Skyrmion Alignment and Pinning Effects in a Disordered Multi-Phase Skyrmion Material Co8Zn8Mn4
• Characterization of a Disordered Above Room Temperature Skyrmion Material Co8Zn8Mn4
• Skyrmion-Excited Spin Wave Fractal Network
• Effect of chemical substitution on the skyrmion phase in Cu${}_2$OSeO${}_3$
• Observation of magnetic skyrmion lattice in Cr${}_{0.82}$Mn${}_{0.18}$Ge by small-angle neutron scattering