Response of the Skyrmion Lattice in MnSi to Cubic Magnetocrystalline Anisotropies

T. Adams, M. Garst, A. Bauer, R. Georgii, C. Pfleiderer

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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-Q→ state, where the modulus |Q→| is constant and the wave vectors enclose rigid angles of 120°. Along a great circle across «100», «110», and «111» the normal to the Skyrmion-lattice plane varies systematically by ±3° with respect to the field direction, while the in-plane alignment displays a reorientation by 15° for magnetic field along «100». Our observations are qualitatively and quantitatively in excellent agreement with an effective potential, which 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.

Original languageEnglish
Article number187205
JournalPhysical Review Letters
Volume121
Issue number18
DOIs
StatePublished - 2 Nov 2018

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