Papers by Keyword: Magnetic Property

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Authors: Sergey M. Zharkov, Roman R. Altunin, Evgeny T. Moiseenko, Galina M. Zeer, Sergey N. Varnakov, Sergey G. Ovchinnikov
Abstract: Solid-state reaction processes in Fe/Si multilayer nanofilms have been studied in situ by the methods of transmission electron microscopy and electron diffraction in the process of heating from room temperature up to 900ºС at a heating rate of 8-10ºС/min. The solid-state reaction between the nanolayers of iron and silicon has been established to begin at 350-450ºС increasing with the thickness of the iron layer.
Authors: Irina Kamynina, Dmitry Bazhanov, Julia Korobova
Abstract: We present ab initio study of the magnetic properties of monatomic 3d transition metal (Mn, Fe, Co, Ni) nanowires without and with oxygen atoms on vicinal Rh (553) surface. We considered different experimentally observed submonolayer quantities of oxygen atoms. It was found that monatomic 3d metal nanowires without oxygen are in magnetic states. Within oxidized metal nanowires oxygen atoms affect on the magnetic moments and magnetic interaction of metal atoms. This influence leads to reduced (in the case of Mn, Fe and Co atoms) or quenched (in the case of Ni atoms) magnetic moment for these metal atoms.
Authors: Shun Bing Zhou, Da Jun Feng, Zhao Jun Deng
Abstract: A measurement method for magnetic property of the non-oriented silicon steels WD23 and WD20 by X-ray diffraction (XRD) has been introduced. The measurement results show that this method is simple and the size(amount) of the required sample is small. Therefore, the method is reasonable.
Authors: Lei Feng, Fei Wang, Ju Gao, Yu Gang Fan, Xue Nan Deng
Abstract: The Heusler alloy system is a rich source of functional materials. We studied the ternary alloy Ti2NiSb by first-principles calculations to explore for new functional alloy. We performed geometry optimization for the alloy with Hg2CuTi-type structure and the obtained equilibrium lattice parameter is a0=6.21 . The magnetic moments of atom Ni is 0.22μB in one cell. The alloy is a ferromagnet. The little magnetic moment of atom Ni comes from the characteristic spatial occupation of the atoms in the space structure of the alloy.
Authors: F.M.M. Pereira, A.S.B. Sombra
Abstract: The Ferrite term is used to refer to all magnetic oxides containing iron as major metallic component which has great to technological applications because of their ferromagnetic and insulating properties at room temperature. Among such ferrites, the hexagonal ones (hexaferrites) have long been used for permanent magnets and are of interest for microwave applications. The hexaferrite M-type has a structure built up from the S blocks interposed by the R block and are symbolically described as RSR*S*. In the last decades there has been great interest in the hexaferrites M-Type for applications as electronic components for mobile and wireless communications at microwave/GHz frequencies, electromagnetic wave absorbers for electromagnetic compatibility (EMC), radar absorting material (RAM) and stealth technologies and as composite materials. This review aimed study the structure, magnetic and dielectric properties of the hexaferrite BaxSr1-xFe12O19, which is a promising material for electronic devices and for small dielectric resonator antennas (MRA).The outline of this Review Paper is as follows:
Authors: Yu Zhang, Zi Jian Wang, Yi Lin Wang, Zhi Jian Zhang, Yi Sheng Zhang
Abstract: Magnetic nondestructive testing methods including eddy current testing, magnetic memory, magnetic Barkhausen noise and so on are widely used in testing mechanical properties of ferromagnetic parts. Experiments were done to study the relationship between hardness and magnetic properties of ultra-high strength steel (UHSS), which plays an important role in automobile industry. The magnetic properties of UHSS specimens with different hardness were studied. The result shows that there is a strong connection between hardness and magnetic properties. Coercive force of UHSS is proportional to the hardness. This can be used to explain certain mechanism of magnetic nondestructive testing method such as connection between hardness and Barkhausen noise.
Authors: D. Kim, E.S. Vasilieva, A.G. Nasibulin, D.W. Lee, Oleg V. Tolochko, Byoung Kee Kim
Abstract: Magnetic oxide-coated iron nanoparticles with the mean size ranging from 6 to 75 nm were synthesized by aerosol method using iron carbonyl as a precursor under the flowing inert gas atmosphere. Oxide shells were formed by passivation of as-prepared iron particles. The influence of experimental parameters on the nanoparticles’ microstructure, phase composition and growth behavior as well as magnetic properties were investigated and discussed in this study.
Authors: Zhao Yang Cheng, Jing Liu, Wen Si Chen, Guo Dong Sun, Xi Feng Lin, Yuan Zhu, Shang Zhu, Jia Chen Zhu, Zhi Dong Xiang
Abstract: Fe-6.5wt%Si silicon steel has excellent soft magnetic properties, but its ductility in room temperature is near zero. A lot of researchers tried to improve the ductility by adding alloy elements. In this paper, we summarized the action mechanism and the content of these alloy elements according to the overseas and domestic research status. Al, B, Cr, RE, et al. improved the ductility of Fe-6.5wt%Si silicon steel in low temperature, but reduced its magnetic properties simultaneously. Ni, Ti, Mn, et al. improved the ductility of Fe-6.5wt%Si silicon steel inconspicuously.
Authors: L. Stojanova, K. Russew, L. Sapundjiev, J. Bijev, V. Yankova
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