Samples with inversion parameter values (?) ranging from 0.27 to 0.14 while maintaining the crystallite size value have been successfully fabricated commercially available powders by mechanical grinding and thermal annealing treatments at temperatures between 400 600 °C. Detailed characterization studies of these samples using X-ray, neutron diffraction magnetic measurements confirmed for first...

A Hubbard model with a single, partially flat band has ferromagnetic ground states. It is shown that local stability of ferromagnetism implies its global stability in such a model: The model has only ferromagnetic ground states if there are no single spin-flip ground states. Since a single-band Hubbard model away from half filling describes a metal, this result may open a route to metallic ferr...

Abstract Among chromium trihalides, a specific group of layered van der Waals magnetic materials, trichloride (CrCl 3 ) is the only system relatively stable under ambient conditions. This also observed in reduced dimensionality where emergence extrinsic long-range ordered oxidized and Cl-vacancy-defective CrCl phases experimentally reported. In this work, properties such two-dimensional (2D) sy...

Multiferroic materials with good magneto-electric coupling are of great interest due to their enormous applications in the field spintronic devices. Magnetoelectric (ME) gallium ferrite is an interesting material its room temperature (RT) piezoelectricity and near RT ferrimagnetism along significant ME (10 −11 s/m at 4.2 K). The work aims increase magnetic transition (T C ) above so that can ha...

Nanosheets composed of stacked atomic layers exhibit unique magnetic, electrical, and electrochemical properties. Here, we report the effect iron substitution on structure magnetism nickel hydroxide, Ni(OH)2, nanosheets. Ni(OH)2 iron-substituted (5, 10, 20, 50 % Fe substitution) were synthesized using a rapid microwave-assisted hydrothermal process. Scanning transmission electron microscopy sho...

Abstract Hexagonal LuFe 2 O 4 is a promising charge order (CO) driven multiferroic material with high and spin-ordering temperatures. The coexisting spin orders on Fe 3+ /Fe 2+ sites result in magnetoelectric behaviors, but the coupling mechanism between remains elusive. Here, by tuning external pressure, we reveal three charge-ordered phases suggested correlation to magnetic : (i) centrosymmet...

Ferromagnetism in the Hubbard model with an infinite-range hopping. Abstract We prove, as recently conjectured, that the ground state of the Hub-bard Hamiltonian with an infinite-range hopping, when the number of electrons N e = N + 1 (N being the number of sites), is ferromagnetic fully polarized. Despite its long history, the problem of itinerant ferromagnetism is still, to many regards, an o...

Hydrophilic Fe3O4 nanoparticles with controllable size and shape have been fabricated using a facile solvothermal approach followed by surface modification with polyacrylic acid (PAA). The nanoparticles form one-dimension photonic crystal structure under external magnetic field ranging from 29.6 to 459 G. The reflection peaks of formed photonic crystals cover the entire visible spectrum, which ...

A family of homo-valent [Co(II)(7)(OH)(6)(L(1))(6)](NO(3))(2) (1), [(MeOH)(2) is a subset of Co(II)(7)(OH)(6)(L(1))(6)](NO(3))(2) (2) (where L(1)H = 2-iminomethyl-6-methoxyphenol) and hetero-valent [(NO(3))(2) is a subset of Co(III)Co(II)(6)(OH)(6)(L(2))(6)](NO(3))·3MeCN (4) (where L(2)H = 2-iminophenyl-6-methoxyphenol) complexes possess metallic skeletons describing planar hexagonal discs. The...

Mn doped ZnO nanowires have been synthesized using a simple autocombustion method. The as-synthesized Mn doped ZnO nanowires were characterized by X-ray diffraction and transmission electron microscopy. An increase in the hexagonal lattice parameters of ZnO is observed on increasing the Mn concentration. Optical absorption studies show an increment in the band gap with increasing Mn content, an...