نتایج جستجو برای: ferromagnetic materials
تعداد نتایج: 449529 فیلتر نتایج به سال:
The defect formation energies of transition metals (Cr, Fe, and Ni) doped in the pseudo-H passivated ZnO nanowires and bulk are systematically investigated using first-principles methods. The general chemical trends of the nanowires are similar to those of the bulk. We also show that the formation energy increases as the diameter of the nanowire decreases, indicating that the doping of magnetic...
Dilute ferromagnetic oxides having Curie temperatures far in excess of 300 K and exceptionally large ordered moments per transition-metal cation challenge our understanding of magnetism in solids. These materials are high-k dielectrics with degenerate or thermally activated n-type semiconductivity. Conventional super-exchange or double-exchange interactions cannot produce long-range magnetic or...
Since the discovery of colossal magnetoresistance in manganites, there is a high interest in the fabrication of magnetic tunnel junctions made with all-oxide ferromagnetic electrodes and barrier. (001)-oriented La2/3Ca1/3MnO3 (LCMO) and SrTiO3 (STO) films are the most investigated materials as ferromagnetic electrode and tunnel barrier, respectively. The usefulness of these oxides for the appli...
The transport properties of diffusive spin currents have been investigated in lateral ferromagnetic/non-magnetic metal hybrid structures. The spin diffusion processes were found to be strongly dependent on the magnitude of the spin resistances of connected materials. Efficient spin injection and detection are accomplished by optimizing the junction structures on the basis of the spin resistance...
An electric ferroaxial moment is a fundamental dipole like the ferroelectric, ferromagnetic, and ferromagnetic-toroidal moments. Nevertheless, its nature has been masked compared to ferromagnetic ferroelectric cases. Based on symmetry microscopic-model analyses, author reveals when how such entity appears in magnetic materials. It demonstrated that vortex spin configuration naturally induces mo...
An overview of some structural aspects of magnetic ordering is presented. Magnetic symmetry operations, point groups, and Bravais lattices will be utilized to describe the magnetic symmetry of various magnetic materials. Throughout the talk, the utilization of the theory of magnetic symmetry will be emphasized. The magnetic space groups of Fe, Co, Ni, α’-FeCo, CoPt, CrPt3, and Cu2MnAl will be e...
Ferromagnetic insulators are required for many new magnetic devices, such as dissipationless quantum-spintronic devices, magnetic tunneling junctions, etc. Ferromagnetic insulators with a high Curie temperature and a high-symmetry structure are critical integration with common single-crystalline oxide films or substrates. So far, the commonly used ferromagnetic insulators mostly possess low-sym...
This review seeks to summarize the recent developments in the synthesis, structural characterization, properties, and applications in the ®elds of amorphous, bulk amorphous, and nanocrystalline soft magnetic materials. Conventional physical metallurgical approaches to improving soft ferromagnetic properties have relied on the optimization of chemical and microstructural features. Within the las...
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