Publications by Thorsten Hesjedal

Oriented 3D Magnetic Biskyrmions in MnNiGa Bulk Crystals.

Advanced materials (Deerfield Beach, Fla.) 31 (2019) e1900264-

X Li, S Zhang, H Li, DA Venero, JS White, R Cubitt, Q Huang, J Chen, L He, G van der Laan, W Wang, T Hesjedal, F Wang

A biskyrmion consists of two bound, topologically stable, skyrmion spin textures. These coffee-bean-shaped objects are observed in real space in thin plates using Lorentz transmission electron microscopy (LTEM). From LTEM imaging alone, it is not clear whether biskyrmions are surface-confined objects, or, analogous to skyrmions in noncentrosymmetric helimagnets, 3D tube-like structures in a bulk sample. Here, the biskyrmion form factor is investigated in single- and polycrystalline-MnNiGa samples using small-angle neutron scattering. It is found that biskyrmions are not long-range ordered, not even in single crystals. Surprisingly all of the disordered biskyrmions have their in-plane symmetry axis aligned along certain directions, governed by the magnetocrystalline anisotropy. This anisotropic nature of biskyrmions may be further exploited to encode information.

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