Journal ArticleDOI
Magnetic structures of cubic FeGe studied by small-angle neutron scattering
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TLDR
The magnetic ordering of a single crystal of the cubic polymorph of FeGe has been studied by small-angle neutron scattering as discussed by the authors, and the magnetic ordering in cubic FeGe is a Dzyaloshinskii spiral similar to the structure observed in the compound MnSi.Abstract:
The magnetic ordering of a single crystal of the cubic polymorph of FeGe has been studied by small-angle neutron scattering. The compound orders magnetically at TN=278.7 K into a long-range spiral (period approximately 683-700 AA) propagating along equivalent directions at high temperatures and along equivalent directions at low temperatures. The length of the spiral wavevector is nearly independent of temperature. The transition at TN is first order with very little hysteresis. The transition at which the direction of the spiral turns is rather sluggish. It takes place in a temperature interval of approximately 40 K and shows pronounced temperature hysteresis (T2 down arrow =211 K, T2 up arrow =245 K). Applied magnetic fields of 20-40 mT, depending on the temperature and the field direction, cause the spiral axis to turn into the direction of the applied field. As the field is further increased, the amplitude of the antiferromagnetic spiral decreases and the ferromagnetic component increases until at fields above approximately 200-300 mT cubic FeGe becomes magnetically saturated. The magnetic ordering in cubic FeGe is a Dzyaloshinskii spiral similar to the structure observed in the isostructural compound MnSi. However, in MnSi the spiral propagates along equivalent directions at all temperatures below TN=29.5 K.read more
Citations
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Journal ArticleDOI
Topological properties and dynamics of magnetic skyrmions
TL;DR: From this description, potential applications of skyrmions as information carriers in magnetic information storage and processing devices are envisaged.
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Spontaneous skyrmion ground states in magnetic metals
TL;DR: It is theoretically shown that skyrmion textures may form spontaneously in condensed-matter systems with chiral interactions without the assistance of external fields or the proliferation of defects, within a phenomenological continuum model based on a few material-specific parameters that can be determined experimentally.
Journal ArticleDOI
Near room-temperature formation of a skyrmion crystal in thin-films of the helimagnet FeGe
Xiuzhen Yu,Naoya Kanazawa,Yoshinori Onose,Koji Kimoto,Weizhu Zhang,Shintaro Ishiwata,Yoshio Matsui,Yoshinori Tokura +7 more
TL;DR: The formation of SkX close to room temperature in thin-films of the helimagnet FeGe with magnetic chirality inversion of the SkX across lattice twin boundaries will pave a new path to designing quantum-effect devices based on the controllable skyrmion dynamics.
Journal ArticleDOI
Magnetic Skyrmion Materials.
TL;DR: The materials science and materials chemistry of magnetic skyrmions are described using the classification scheme of theskyrmion forming microscopic mechanisms, including the generation of emergent magnetic and electric field by statics and dynamics of skrymions and the inherent magnetoelectric effect.
Journal ArticleDOI
Towards control of the size and helicity of skyrmions in helimagnetic alloys by spin-orbit coupling
Kiyou Shibata,Xiuzhen Yu,Toru Hara,Daisuke Morikawa,Naoya Kanazawa,Koji Kimoto,Shintaro Ishiwata,Yoshio Matsui,Yoshinori Tokura,Yoshinori Tokura +9 more
TL;DR: The correlation between skyrmion helicity and crystal chirality in alloys of helimagnets Mn(1-x)Fe(x)Ge with varying compositions is reported on by Lorentz transmission electron microscopy and convergent-beam electron diffraction over a broad range of compositions.
References
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Journal ArticleDOI
Theory of helical magnetic structures and phase transitions in MnSi and FeGe
Per Bak,Mogens H. Jensen +1 more
TL;DR: In this article, the long-period helical magnetic structures in MnSi and FeGe are shown to be consequences of a ferromagnetic Dzyaloshinskii instability, and Renormalisation group theory predicts the transition to first order, in agreement with experiments on MnSi.
Journal ArticleDOI
Helical spin structure in manganese silicide MnSi
TL;DR: In this article, a conical spin structure whose screw axis coincides with the magnetic field direction and whose period is independent of the applied field is realized in magnetic fields greater than 4 kOe.
Journal ArticleDOI
The origin of the helical spin density wave in MnSi
TL;DR: In this paper, it was shown that an itinerant electron ferromagnet with no inversion symmetry is unstable against a helical spin density wave (HSDW) if a magnetic anisotropy energy is sufficiently small.
Journal ArticleDOI
Long period helimagnetism in the cubic B20 FexCo1−xSi and CoxMn1−x Si alloys
J. Beille,J. Voiron,M. Roth +2 more
TL;DR: In this paper, magnetization, resistivity and small angle neutron scattering experiments on cubic B20 FexCo1−x SI alloys (0.3 ⊽ x ⩽ 0.9) and CoxMn 1−xSi allpys (x = 0.02, 0.04 and 0.06).
Journal ArticleDOI
The nature of the bonds in the iron silicide, FeSi, and related crystals
Linus Pauling,A. M. Soldate +1 more
TL;DR: In this article, a detailed discussion of the structure and the values of the interatomic distances has been given, by application of the resonating-valence-bond theory.