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Nanoscale imaging and control of altermagnetism in MnTe.
Nature
December 2024
School of Physics and Astronomy, University of Nottingham, Nottingham, UK.
Nanoscale detection and control of the magnetic order underpins a spectrum of condensed-matter research and device functionalities involving magnetism. The key principle involved is the breaking of time-reversal symmetry, which in ferromagnets is generated by an internal magnetization. However, the presence of a net magnetization limits device scalability and compatibility with phases, such as superconductors and topological insulators.
View Article and Find Full Text PDFSpin-Orbit Torque Booster in an Antiferromagnet via Facilitating a Global Antiferromagnetic Order: A Route toward an Energy-Efficient Memory.
ACS Appl Mater Interfaces
November 2024
Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu 300093, Taiwan.
Spin transport and the associated spin torque effects in antiferromagnets (AFMs) are scientifically interesting but have remained elusive due to the varied observations of spin transport in AFMs. This study revisits the role of a global Néel order in nickel oxide (NiO) facilitated through a spin-orbit torque (SOT) and examines the enhanced SOT efficiency in a heavy metal (W)/AFM (NiO)/ferromagnet (FM, CoFeB) trilayer with varying NiO thicknesses ranging from 1 to 5 nm. At the as-grown state, the Néel order of NiO is randomly oriented due to the polycrystalline nature of the film structure, leading to increased spin absorption and blocking spin transport from the adjacent W layer.
View Article and Find Full Text PDFWavelength dependence of linear birefringence and linear dichroism of BiPbSrCaCuO single crystals.
Sci Rep
November 2024
Faculty of Science and Engineering, Waseda University, 2-2 Wakamatsu-cho, Shinjuku-ku, Tokyo, 162-8480, Japan.
Copper oxide high-temperature superconductors, such as BiSrCaCuO (Bi2212), have garnered extensive research interest due to their high critical temperatures (T) surpassing the Bardeen-Cooper-Schrieffer (BCS) limit. The two-dimensional CuO₂ plane is widely regarded as the most crucial element of high-T cuprate superconductors. The anisotropy of this CuO₂ layer remains a topic of ongoing interest.
View Article and Find Full Text PDFVan der Waals GeSe with Strain- and Gate-Tunable Linear Dichroism for Wearable Electronics.
Small
January 2025
Engineering Research Centre for Micro-Nano Optoelectronic Materials and Devices, Ministry of Education, OSED, Fujian Provincial Key Laboratory of Semiconductor Materials and Applications, Department of Physics, Xiamen University, Xiamen, 361005, P. R. China.
The direct detection of light polarization poses a crucial challenge in the field of optoelectronics and photonics. Herein, the tunable linear dichroism (LD) in GeSe-based polarized photodetectors is presented through electronic and structural asymmetry modulation, and demonstrate their application prospects in wearable electronics. An improvement in the dichroic ratio up to 34% is achieved under a gate voltage of 20 V, and the improvement reaches 44% by applying a tensile strain along the zigzag direction.
View Article and Find Full Text PDFExcited State Band Mapping and Ultrafast Nonequilibrium Dynamics in Topological Dirac Semimetal 1T-ZrTe.
Nano Lett
October 2024
Université de Bordeaux - CNRS - CEA, CELIA, UMR5107, F33405 Talence, France.
Article Synopsis
- Researchers used advanced momentum microscopy to investigate the electronic properties of the topological Dirac semimetal 1T-ZrTe, specifically focusing on the behavior of its Dirac cone above the Fermi level.
- They discovered the role of different scattering processes in how electrons relax, observing important electron-hole interactions and finding that the electrons' lifetime correlates linearly with their excess energy.
- The study offers new insights into the excited state dynamics of 1T-ZrTe, contributing to the understanding of ultrafast electron behaviors in 3D topological materials.
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