نتایج جستجو برای: high saturation magnetization
تعداد نتایج: 2108131 فیلتر نتایج به سال:
The magnetization behavior of long nanowires with square cross section under the influence of strong perpendicular spin-polarized current is studied theoretically. The study is based on Landau-Lifshitz-Slonczewski phenomenology. Without the current the wire is magnetized uniformly along its axis. For small currents the wire magnetization remains uniform, but it inclines with respect to the wire...
A transition from a low to a high spin state in the magnetization saturation between 1000 and 1100 oC calcination temperature is observed in YIG powders prepared by oxides mixture. Spark plasma sintering of these powders between 900 and 950 oC leads to dense samples with minimal formation of YFeO3, opening the way to cosintering of YIG with metals or metallic alloys. The optical properties depe...
We investigate the quantum phase diagram of the exactly solved mixed spin-(1 2 , 1) ladder via the thermodynamic Bethe ansatz (TBA). In the absence of a magnetic field the model exhibits three quantum phases associated with su(2), su(4) and su(6) symmetries. In the presence of a strong magnetic field, there is a third and full saturation magnetization plateaux within the strong antiferromagneti...
Epitaxial copper ferrite thin films were deposited on MgO substrates by the alternating target laser ablation deposition method. A series of films was studied to explore the impact of oxygen operating pressure, substrate temperature, and the ratio of laser shots incident on each target upon the magnetic, structural, and atomic structural properties. The highest saturation magnetization, 2800 G,...
The present study focuses on investigating the magnetic properties and the critical particle size for developing sizable spontaneous magnetic moment of bare Au nanoparticles. Seven sets of bare Au nanoparticle assemblies, with diameters from 3.5 to 17.5 nm, were fabricated with the gas condensation method. Line profiles of the X-ray diffraction peaks were used to determine the mean particle dia...
Magnetizations of R2Co14B single crystals with R = Nd and Pr have been measured under steady magnetic fields up to 300 kOe. We have shown that the observed data can be well reproduced by nearly the same set of crystalline field and R-3d exchange parameters as that in R2Fel4B system. Since the discovery of NdzFelsB, a wide variety of magnetization curves in high fields has been observed for diff...
Cs2CuBr4 and Ba3NiSb2O9 are magnetically described as quasi-two-dimensional triangular-lattice antiferromagnets with spin1 2 and 1, respectively. We show that both systems exhibit a magnetization plateau at one-third of the saturation magnetization Ms due to the interplay of spin frustration and quantum fluctuation. In Cs2CuBr4 that has a spatially anisotropic triangular lattice, successive mag...
In this paper we focus on the contrast problem in medical imaging. It consists of using a single magnetic field to control a pair of non-interacting spins, each representing a specific substance, with the goal of maximizing the difference of the moduli of the magnetization vectors of the two substances. Prior work analyzed the saturation contrast problem which brings one of the spins to magneti...
Because of the biological compatibility, light weight and low cost, the possibility of having a room temperature carbon-based metal-ion free magnet attracts currently the interest of the scientific community. The search for magnetic ordering in carbon-based materials started, however, more than 15 years ago as Makarova [1] recently reviewed in detail. First claims on the existence of carbon-bas...
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