Response of the skyrmion lattice in MnSi to cubic magnetocrystalline anisotropies

Abstract

We report high-precision small angle neutron scattering of the orientation of the skyrmion lattice in a spherical sample of MnSi under systematic changes of the magnetic field direction. For all field directions the skyrmion lattice may be accurately described as a triple-$\vec{Q}$ state, where the modulus $|\vec{Q}|$ is constant and the wave vectors enclose rigid angles of $120^{\circ }$. Along a great circle across $⟨100⟩$, $⟨110⟩$, and $⟨111⟩$ the normal to the skyrmion-lattice plane varies systematically by $\pm 3^{\circ }$ with respect to the field direction, while the in-plane alignment displays a reorientation by $15^{\circ }$ for magnetic field along $⟨100⟩$. Our observations are qualitatively and quantitatively in excellent agreement with an effective potential, that is determined by the symmetries of the tetrahedral point group $T$ and includes contributions up to sixth-order in spin-orbit coupling, providing a full account of the effect of cubic magnetocrystalline anisotropies on the skyrmion lattice in MnSi.

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Cited by in corpus (12)

• Topological magnon band structure of emergent Landau levels in a skyrmion lattice
• Coupled quasimonopoles in chiral magnets
• Nonreciprocity of spin waves in noncollinear magnets due to the Dzyaloshinskii-Moriya interaction
• Weak crystallization of fluctuating skyrmion textures in MnSi
• Evolution of magneto-crystalline anisotropies in Mn${}_{1-x}$Fe${}_x$Si and Mn${}_{1-x}$Co${}_x$Si as inferred from small-angle neutron scattering and bulk properties
• Unpinning the skyrmion lattice in MnSi:Effect of substitutional disorder
• Direct observation of the exchange anisotropy in the helimagnetic insulator Cu${}_2$OSeO${}_3$
• Entropic signatures of the skyrmion lattice phase in MnSi1-xAlx and Fe1-yCoySi
• Effect of chemical substitution on the skyrmion phase in Cu${}_2$OSeO${}_3$
• Angle-Resolved Magneto-Chiral Anisotropy in a Non-Centrosymmetric Atomic Layer Superlattice
• Magnetic field-induced chiral soliton lattice in the bulk magnetoelectric helimagnet Cu${}_2$OSeO${}_3$
• Cubic magnetic anisotropy in $B$20 magnets: Interplay of anisotropy and magnetic order in Fe${}_{1-x}$Co${}_x$Si