Low-dimensional magnetic materials with high stabilities and outstanding magnetic properties are essential for the next generation of spintronic devices. We will discuss the intrinsic magnetism in two-dimensional (2D) transition-metal chalcogenides M n T n + 1 (M = V, Cr, and Mn; T = S, Se, and Te; and n = 2, 3, and 4) in which many ferromagnetic half-metals and semiconductors were discovered, and some of them were dynamically stable. In particular, the dependence of the electronic structure and magnetism on the number of layers is discussed. Compared with the corresponding MT 2 of the monolayer limit, that is, the well-known transition-metal dichalcogenides, the essential charge imbalance between the metal ion layers would influence the molecular orbital states, which leads to rich and subtle electronic and magnetic properties. Our findings not only enrich the family of 2D transition-metal ferromagnets but also open up avenues for the design and synthesis of other novel 2D multilayer magnets.
CuBe composite wires of 100 μm in diameter coated with a layer of NiCoP were prepared by a chemical plating method under DC current (CPUDC). The influences of DC current on coating morphology, deposition rate, composition, giant magneto-impedance (GMI) effect and magnetic properties were investigated. It was shown that the circumferential domain structure of coating layer was induced by the DC current going through the wires. A maximum GMI ratio of 870% was obtained in the composite wire prepared under 150 mA and tested at 180 kHz. It is 30 times higher than that of the composite wire plated in the same condition by conventional chemical plating method, indicating that CPUDC is an easy and effective approach to obtain composite wires and its applications will be further extended on magnetic sensors.
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