Topological domain walls in helimagnets

Schoenherr, Peggy; Müller, Jan; Köhler, Laura; Rosch, Achim; Kanazawa, Naoya; Tokura, Y.; Garst, Markus; Meier, Dennis

doi:10.1038/s41567-018-0056-5

Cited by 70 publications

(93 citation statements)

References 41 publications

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“…(19) similar to the case of µ in Eq. (14). Experimentally it is found that λ 2 /λ 1 ≈ 0.14, although both terms are nominally of sixth order in λ SOC .…”

Section: Mca Potential Of Skyrmion Lattice Rotationmentioning

confidence: 92%

Response of the Skyrmion Lattice in MnSi to Cubic Magnetocrystalline Anisotropies

et al. 2018

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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, 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. arXiv:1811.12439v1 [cond-mat.str-el]

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“…(19) similar to the case of µ in Eq. (14). Experimentally it is found that λ 2 /λ 1 ≈ 0.14, although both terms are nominally of sixth order in λ SOC .…”

Section: Mca Potential Of Skyrmion Lattice Rotationmentioning

confidence: 92%

Response of the Skyrmion Lattice in MnSi to Cubic Magnetocrystalline Anisotropies

et al. 2018

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“…Instead, considering that Lorentz microscopy probes the in‐plane magnetic induction rather than the in‐plane magnetization, the zig‐zag wall contrast and, to some extent, the fractal‐like contrast can be explained by a changing lattice orientation of the helical spins that generates a magnetization divergence and stray fields. Such a contrast was specifically visualized with magnetic force microscopy in B20 FeGe crystals at helix lattice boundaries [ 60 ] that lack a net in‐plane magnetization.…”

Section: Figurementioning

confidence: 99%

Chiral Spin Textures in Amorphous Iron–Germanium Thick Films

et al. 2021

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Topological solitary fields, such as magnetic and polar skyrmions, are envisioned to revolutionize microelectronics. These configurations have been stabilized in solid-state materials with a global inversion symmetry breaking, which translates in magnetic materials into a vector spin exchange known as the Dzyaloshinskii-Moriya interaction (DMI), as well as spin chirality selection and isotropic solitons. This work reports experimental evidence of 3D chiral spin textures, such as helical spins and skyrmions with different chirality and topological charge, stabilized in amorphous Fe-Ge thick films. These results demonstrate that structurally and chemically disordered materials with a random DMI can resemble inversion symmetry broken systems with similar magnetic properties, moments, and states. Disordered systems are distinguished from systems with global inversion symmetry breaking by their degenerate spin chirality that allows for forming isotropic and anisotropic topological spin textures at remanence, while offering greater flexibility in materials synthesis, voltage, and strain manipulation. The discovery of unprecedented physical properties and application potential of topologically protected non-collinear states in condensed matter has greatly influenced the direction of

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“…While topological spin textures are sometimes randomly dispersed as either defects or excited states [15,21,22], they can also be densely packed and described in terms of superposition states of spin spirals with propagation vectors q that define multi-q states [12,16,[23][24][25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Topological spin-hedgehog crystals of a chiral magnet as engineered with magnetic anisotropy

et al. 2017

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We report the engineering of spin-hedgehog crystals in thin films of the chiral magnet MnGe by tailoring the magnetic anisotropy. As evidenced by neutron scattering on films with different thicknesses and with varying magnetic field, we can realize continuously deformable spin-hedgehog crystals, each of which is described as a superposition state of a different set of three spin spirals (a triple-q state). The directions of the three propagation vectors q vary systematically, gathering from the three orthogonal 100 directions towards the film normal as the strength of the uniaxial magnetic anisotropy and/or the magnetic field applied along the film normal increase. The formation of triple-q states coincides with the onset of topological Hall signals, which is ascribed to skew scattering by emergent magnetic field originating in the non-trivial topology of spin hedgehogs.These findings highlight how nano-engineering of chiral magnets makes possible the rational design of unique topological spin textures. 72.15.Gd

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Topological domain walls in helimagnets

Cited by 70 publications

References 41 publications

Response of the Skyrmion Lattice in MnSi to Cubic Magnetocrystalline Anisotropies

Response of the Skyrmion Lattice in MnSi to Cubic Magnetocrystalline Anisotropies

Chiral Spin Textures in Amorphous Iron–Germanium Thick Films

Topological spin-hedgehog crystals of a chiral magnet as engineered with magnetic anisotropy

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