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Role of Competing Magnetic Exchange on Non-Collinear to Collinear Magnetic Ordering and Skyrmion Stabilization in Centrosymmetric Hexagonal Magnets.
ACS Nano
January 2025
School of Physical Sciences, National Institute of Science Education and Research, HBNI, Jatni 752050, India.
Topological magnetic skyrmions with helicity state degrees of freedom in centrosymmetric magnets possess great potential for advanced spintronics applications and quantum computing. Till date, the skyrmion study in this class of materials mostly remains focused to collinear ferromagnets with uniaxial magnetic anisotropy. Here, we present a combined theoretical and experimental study on the competing magnetic exchange-induced evolution of noncollinear magnetic ground states and its impact on the skyrmion formation in a series of centrosymmetric hexagonal noncollinear magnets, MnFeCoGe.
View Article and Find Full Text PDFPotential magnetic structure in Eu3InAs3 revealed by magnetization and thermodynamic study.
J Phys Condens Matter
January 2025
Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, No.8 South Third Street, Zhongguancun, Beijing, 100190, CHINA.
We systematically investigate the magnetization and thermodynamic responses associated with antiferromagnetic (AFM) transitions in single crystals of the magnetic semiconductor Eu3InAs3. The linear thermal expansion measurements around the AFM transition temperatures, TN1 and TN2, indicate an expansion along the a axis and contraction along the b and c axes. The calculated ∆V/V(T) shows a continuous change at TN, indicating a second-order magnetic phase transition.
View Article and Find Full Text PDFMagnetic phase transition and magnetocaloric effect in hexagonal MnCoGe alloys mediated by axial strain: a Monte Carlo study.
Phys Chem Chem Phys
January 2025
Department of Physics, College of Sciences, Northeastern University, Shenyang 110819, China.
Article Synopsis
- The study investigates how axial strain affects the magnetic properties of hexagonal MnCoGe alloys, focusing on the transition from ferromagnetic to antiferromagnetic states.
- It combines first-principles calculations and Monte Carlo simulations to show that compressive strains stabilize ferromagnetism, while tensile strains lead to antiferromagnetism, with the transition temperature rising as compressive strain increases.
- The research identifies key magnetic exchange couplings and demonstrates that applying strain enhances magnetic stability and improves control over the magnetocaloric effect, with notable changes in magnetic entropy under a magnetic field.
Permanent Electride Magnets Induced by Quasi-Atomic Non-Nucleus-Bound Electrons.
Adv Mater
January 2025
Department of Materials Science and Engineering, Yonsei University, Seoul, 03722, Republic of Korea.
Article Synopsis
- Interstitial quasi-atomic electrons (IQEs) significantly influence the magnetism of crystalline electrides, with their own magnetic moments affected by nearby cations.
- Weak spin-orbit coupling and limited interactions prevent these systems from achieving hard magnetism, presenting a challenge for stronger magnetic properties.
- However, certain 2D electrides, like [ReC]·2e, exhibit permanent magnetism by creating a ferrimagnetic state and demonstrate high coercivity due to the interaction between Re-spin and IQE-spin lattices.
Formation of individual stripes in a mixed-dimensional cold-atom Fermi-Hubbard system.
Nature
January 2025
Max-Planck-Institut für Quantenoptik, Garching, Germany.
Article Synopsis
- The study explores the connection between d-wave superconductivity and stripe phases in high-temperature cuprate superconductors, revealing how anisotropic couplings can enhance critical temperatures.
- Recent advancements in quantum simulators using ultracold atoms allow for the experimentation and observation of these phenomena in real-time at a detailed level.
- The research presents evidence of stripe formation in a cold-atom Fermi-Hubbard simulator, showing attractive correlations between dopants and suggesting the presence of a precursor to the stripe phase, which involves complex charge and spin ordering.
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