11/21/2023 0 Comments Square lattice atomic![]() Giant Hall resistivity and magnetoresistance in cubic chiral antiferromagnet EuPtSi. Robust metastable skyrmions and their triangular–square lattice structural transition in a high-temperature chiral magnet. A new class of chiral materials hosting magnetic skyrmions beyond room temperature. Observation of skyrmions in a multiferroic material. Real-space observation of a two-dimensional skyrmion crystal. Noncentrosymmetric magnets hosting magnetic skyrmions. Emergent electrodynamics of skyrmions in a chiral magnet. ![]() Topological Hall effect in the A phase of MnSi. Topological properties and dynamics of magnetic skyrmions. Chiral skyrmionic matter in non-centrosymmetric magnets. Spontaneous skyrmion ground states in magnetic metals. Our results suggest that rare-earth intermetallics with highly symmetric crystal lattices may ubiquitously host nanometric skyrmions of exotic origins. A plausible origin of the observed skyrmion formation is four-spin interactions mediated by itinerant electrons in the presence of easy-axis anisotropy. Here we discover a square skyrmion lattice state with 1.9 nm diameter skyrmions in the centrosymmetric tetragonal magnet GdRu 2Si 2 without a geometrically frustrated lattice by means of resonant X-ray scattering and Lorentz transmission electron microscopy experiments. Until now, it remains an open question if skyrmions can also exist in the absence of both geometrically frustrated lattice and inversion symmetry breaking. Although most known skyrmion systems arise in non-centrosymmetric systems with a Dzyaloshinskii–Moriya interaction, centrosymmetric magnets with a triangular lattice can also give rise to skyrmion formation, with a geometrically frustrated lattice being considered essential in this case. Magnetic skyrmions are topologically stable spin swirls with a particle-like character and are potentially suitable for the design of high-density information bits.
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