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Reorientation Transition Between Square and Hexagonal Skyrmion Lattices near the Saturation into the Homogeneous State in Quasi-Two-Dimensional Chiral Magnets.
Nanomaterials (Basel)
December 2024
International Institute for Sustainability with Knotted Chiral Meta Matter, Kagamiyama, Higashihiroshima 739-8511, Hiroshima, Japan.
I revisit the well-known phase transition between the hexagonal skyrmion lattice and the homogeneous state within the phenomenological Dzyaloshinskii theory for chiral magnets, which includes only the exchange, Dzyaloshinskii-Moriya, and Zeeman energy contributions. I show that, in a narrow field range near the saturation field, the hexagonal skyrmion order gradually transforms into a square arrangement of skyrmions. Then, by the second-order phase transition during which the lattice period diverges, the square skyrmion lattice releases a set of repulsive isolated skyrmions.
View Article and Find Full Text PDFMeron-Mediated Phase Transitions in Quasi-Two-Dimensional Chiral Magnets with Easy-Plane Anisotropy: Successive Transformation of the Hexagonal Skyrmion Lattice into the Square Lattice and into the Tilted FM State.
Nanomaterials (Basel)
September 2024
International Institute for Sustainability with Knotted Chiral Meta Matter, Kagamiyama, Higashihiroshima 739-8511, Hiroshima, Japan.
Article Synopsis
- * The hexagonal skyrmion configuration transforms into a rhombic structure before arriving at a square arrangement, facilitated by the dynamics of merons and anti-merons at the skyrmion boundaries.
- * I also investigate the role of domain-wall merons in the dynamics of square skyrmion lattices, examining spin-wave modes and their response to AC magnetic fields, revealing distinct rotation and annihilation patterns in merons at different frequencies.
Magnetotransport and angle-resolved photoemission spectroscopy of MnSbTe: a new member of MnSb2nTe3n+1family.
J Phys Condens Matter
September 2024
Department of Physics, Indian Institute of Technology Kanpur, Kanpur 208016, India.
The quest for intrinsically ferromagnetic topological materials is a focal point in the study of topological phases of matter, as intrinsic ferromagnetism plays a vital role in realizing exotic properties such as the anomalous Hall effect (AHE) in quasi-two-dimensional materials, and this stands out as one of the most pressing concerns within the field. Here, we investigate a novel higher order member of the MnSb2nTe3n+1family, MnSbTe, for the first time combining magnetotransport and angle-resolved photoemission spectroscopy (ARPES) measurements. Our magnetic susceptibility experiments identify ferromagnetic transitions at temperature= 18.
View Article and Find Full Text PDFDimensionality-Tailored Ferromagnetism in Quasi-Two-Dimensional MnSe for the Magnetoelectrochemical Hydrogen Evolution Reaction in Alkaline Media.
ACS Nano
September 2024
School of Materials Sciences, Indian Association for the Cultivation of Science, Kolkata700032, India.
The application of an external magnetic field to the cathode shows great promise in facilitating the hydrogen evolution reaction (HER) via water electrolysis. However, the criteria for designing such cathodes are still under investigation. Among various aspects, understanding the effect of different magnetic states of the cathode material is crucial, especially for the HER in alkaline conditions, which possesses different reaction steps compared to that in acidic conditions.
View Article and Find Full Text PDFSpin-Phonon Coupling and Magnetic Transition in an Organic Molecule Intercalated CrGeTe.
Nano Lett
July 2024
Department of Physics, The University of Texas at El Paso, El Paso, Texas 79968, United States.
Article Synopsis
- The research investigates how manipulating spin-phonon coupling in two-dimensional van der Waals ferromagnetic semiconductors can enhance magnetism, opening new possibilities for spintronic devices.
- The study uses tetrabutyl ammonium (TBA) as an intercalant to show its effects on the magnetic and electronic properties of CrGeTe, revealing increased ferromagnetic Curie temperature through temperature evolution of Raman modes and magnetization measurements.
- The findings point to significant electron transfer from TBA to Cr, emphasizing the importance of spin-phonon interaction and magnetic ordering in understanding and controlling magnetism in layered structures.
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