Papers by Keyword: Magnetic Measurement

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Authors: S. Takahashi, Naoya Tada, A.Y. Takahashi
Authors: Tatiana S. Gendler, Alla A. Novakova, V.N. Prudnikov, G.P. Aleksandrova, L.A. Grishchenko
Abstract: The comparative study of Fe2O3 4-10nm nanoparticles incorporated in arabinogalactan and polyvinyl alcohol matrixes was performed by means of magnetic measurements in wide 5-900K temperature range, Mossbauer spectroscopy and transmission electron microscopy. The processes of nanoparticles different self-organization inside various polymer matrixes were revealed. These processes lead to unusual magnetic behavior of initially superparamagnetic nanoparticles owing to interparticle interactions.
Authors: David San Martín, Niels H. van Dijk, Yuriy Yagodzinskyy, Ekkes Brück, Sybrand van der Zwaag
Abstract: Maraging steels show an excellent combination of high strength and ductility, which makes them very attractive in a large variety of potential applications. The present work is concerned with the main factors influencing the stability of metastable austenite in such a steel. At subzero temperatures a large variation in the isothermal transformation behaviour of austenite to martensite has been observed. Factors such as the austenite grain size and the interstitial content in solid solution are known to influence austenite stability and, therefore, the martensitic transformation. In this steel, the addition of titanium results in carbonitride precipitation. These precipitates play an indirect but important role in the stability of austenite by means of removing interstitials from the solid solution and by inhibiting an austenite grain growth. The combination of techniques such as X-ray diffraction, magnetisation measurements, three-dimensional neutron depolarisation, and internal friction measurements enables a complete characterisation of the transformation. A step towards understanding the factors responsible for the variation in the behaviour observed is the main contribution of this work.
Authors: István Mészáros
Abstract: In this paper we present a study of the separation of phases in multi-phase alloys. The proposed technique is based on the hyperbolic model of magnetization. In this work the normal magnetization curve of the model was fitted to the measured one. It is possible to decompose the magnetic phases of alloys and determine their magnetic properties separately by using the determined model parameters. Experimental verification was carried out on a transformer like setup, constructed from layered samples. The samples were constructed from elements of strongly different magnetic properties. The results given by the model are in an excellent agreement with the experimental results, giving justification for the proposed method of decomposition. The proposed method could become a vital tool in magnetic investigations.
Authors: Wen Fan, Rui Fen Hou, Jian He, Zhi Gao Zhang, An Li Lin
Abstract: For application in the magnetic material at high temperature, the equipment for the measurement of magnetic properties of hard magnetic material at elevated temperature has been developed. The temperature coefficient of remanence and coercive, demagnetization curves at different temperatures was measured by this equipment. The heating plate which using the mesh screen printer substrate method was designed to realize the accurate measurement in the quasi closed magnetic circuit .The temperature measuring range is from room temp. 500 °C.
Authors: Jun Quan Chen, Dong Wang
Abstract: Applied mechanical stress has a strong influence on magnetic properties of material. The aim of this paper is to discuss key technology of establishing an experimental platform for measuring magnetic properties of electrical sheet under tensile stress. Finally, measurement result of stress dependence of the magnetic characteristic under different applied stress is presented. Some conclusions about the stress-dependent magnetic behavior is also given in this paper.
Authors: A. Martinelli, M. Ferretti, Carlo Castellano, M.R. Cimberle, M. Tropeano, C. Mondelli
Abstract: The crystal and magnetic structures of (Pr0.55Ca0.45)(Mn1-yCry)O3 (y = 0.00, 0.03, 0.06) have been investigated between 5 and 300 K by means of neutron powder diffraction followed by Rietveld refinement and dc magnetic measurements. An orthorhombic-to-monoclinic phase transition occurs on cooling in (Pr0.55Ca0.45)MnO3; at lower temperature charge ordering in the Mn sub-lattice, coupled with orbital ordering, induces an anti-ferromagnetic (AFM) spin ordering within the monoclinic phase. Cr substitution at the Mn site hinders the phase transition, although for the y = 0.03 sample small amounts of the monoclinic phase co-exist at low temperature with the main phase characterized by an orthorhombic structure. In addition Cr favours ferromagnetism (FM) participating to the double exchange mechanism. Cr substitution prevents charge ordering, favouring double exchange and hence FM spin ordering within the Mn sub-lattice. The Curie temperature of the Cr substituted samples is independent on the Cr content.
Authors: Xiao Ping Li, Z.J. Zhao, S. Ang, T.B. Oh, T.W. Song, W.C. Ng, S.J. Koh, Jim Yang Lee
Authors: L. Novák, E. Kisdi-Koszó, A. Stancáková, L. Kafková, M. Konč
Authors: István Mészáros
Abstract: In this paper a new data evaluation technique is presented for non-destructive magnetic measurements. This method is based on the multiphase hyperbolic model of magnetization and it is called model based data evaluation (MBDE) technique. The MBDE method allows us to separate the magnetic contribution of the magnetizing yoke from the measured magnetization curves. Therefore the determined magnetic properties of the tested sample are independent of the parameters of the applied magnetic yoke and the lift-off. The proposed method could become a useful tool in magnetic non-destructive evaluation (NDE).
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