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Robust giant anomalous Nernst effect in polycrystalline nodal web ferromagnets
The transverse thermoelectric effect based on the anomalous Nernst effect (ANE) has attracted attention, especially for thermoelectric and spintronic applications. Fe3X (X = Ga, Al) is known to exhibit a large ANE at room temperature owing to the topological electronic band structure so-called nodal web. Here, we systematically investigate ANE in the polycrystalline Fe3Ga1−xAlx and Fe3Al1−xSix. Despite significant chemical substitutions, a very robust feature of the large ANE −Syx∼ 5.7 μ V/K is found for Fe3Ga1−xAlx (0≲x≲0.6), exhibiting a striking x independent nodal web contribution. Since aluminum is more low-cost and abundant than gallium, our results indicate Fe3Ga1−xAlx (x∼0.6) should be suitable for large-scale thermoelectric applications.
On the origin of magnetic anisotropy in 4f-free ferromagnets based on the CaCu 5 structure *
Using first-principles calculations, we investigate the origin of magnetocrystalline anisotropy in a series of 4f-electron-free intermetallics with CaCu 5 -based structures: YCo 5 , YCo 4 B, and Y 3 Co 13 B 2 . The electronic structure of these compounds is characterized by a set of narrow 3d bands near the Fermi level. In YCo 5 the easy-axis anisotropy originates primarily in the spin–orbit coupling-induced mixing of the electronic states with Co d x 2 -y 2 and d xy character. The analysis of k-resolved anisotropy shows that positive contributions accumulate from the entire Brillouin zone but are particularly large near the k z = 0 plane. The analysis of the single-site and two-site terms reveals a large positive single-site contribution to the magnetocrystalline anisotropy from the Co atoms on the honeycomb sublattice, along with two-site contributions from both honeycomb and kagome sublattices.
Surface magnetism in Fe 3 GeTe 2 van der Waals ferromagnet
The surface magnetization of Fe 3 GeTe 2 was examined by low-energy electron microscopy (LEEM) using an off-normal incidence electron beam. We found that the 180o domain walls are of Bloch type. Temperature-dependent LEEM measurements yield a surface magnetization with a surface critical exponent β1 = 0.79±0.02. This result is consistent with surface magnetism in the 3D semi-infinite Heisenberg (β1 = 0.84±0.01) or Ising (β1 = 0.78±0.02) models, which is distinctly different from the bulk exponent (β = 0.34±0.07). Further, the measurements reveal the power of LEEM with a tilted beam to determine magnetic domain structure in quantum materials, without need for the use of spin-polarized electrons. Single crystal diffraction measurements reveal inversion symmetry-breaking weak peaks and yield space group P-6m2. This Fe site defect-derived loss of inversion symmetry enables the formation of skyrmions in this Fe 3 GeTe 2 crystal.
Tunable giant anomalous Hall effect in the Kondo-lattice ferromagnet UBiTe
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Nonanalytic magnetic response and intrinsic ferromagnetic clusters in a kagome spin-liquid candidate
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Data for Slow ferromagnetic fluctuations in the kagome metal Sc3Mn3Al7Si5 revealed by 27Al NMR
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2D auxetic material with intrinsic ferromagnetism: a copper halide (CuCl 2 ) monolayer
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Domain structure of thin ferromagnetic films domennaya struktura tonkikh ferromagnitnykh plenok
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Development of a Co-W ferromagnetic, high- temperature, structural alloy.
High temperature strength and magnetic properties of cobalt-tungsten alloy for space power generator rotors
Cobalt-tungsten, ferromagnetic high-temperature alloy
Cobalt-base alloy which combines high temperature strength and magnetic properties has a composition in weight percent of 7-1/2 tungsten, 2-1/2 iron, 1 titanium, 1/2 zirconium, 1/2 carbon, and the balance cobalt. It may be used as construction material for electric motors and generators operating at high temperatures.
Study of ferromagnetic liquid
Synthesis and modification of stable colloidal dispersions with strong magnetic responses and Newtonian viscosity
Magnetic moment of ZrZn sub 2 up to 150 kg - Is ''pure'' ZrZn sub 2 ferromagnetic?
Magnetic moment measurements in polycrystalline and single crystal Zr compounds for fields to 150 kgauss
Development of a Co-W ferromagnetic, high- temperature structural alloy.
Co-W alloy for rotor material in space power conversion system improves high temperature stress-rupture and magnetic properties
Bloch wall motion in ferromagnetic films excited by fast-rising hard-axis pulses.
Bloch wall motion along hard direction of Permalloy films due to fast rising hard-axis pulses
Ferromagnetic-fluid logic devices
Logic element switches flows of low pressure process control fluid in fluidics assemblies. Device operates both electrically and fluidically and is controlled by passing permanent magnet or electromagnet over elements, thus providing proximity switching functions.