Bibliographies thématiques / Magnetic propertie

Littérature scientifique sur le sujet « Magnetic propertie »

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Publié le 10 mars 2023

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Articles de revues sur le sujet "Magnetic propertie"

Li, Wei Li, Xiao Chen Liu et Jun Ci Cao. « Influence of Carbon Content on Fe-Cu Alloy Material Performance in Induction Motor with Compound Cage Rotor ». Applied Mechanics and Materials 117-119 (octobre 2011) : 1223–26. http://dx.doi.org/10.4028/www.scientific.net/amm.117-119.1223.

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New type Fe-Cu alloy is used in the bar of induction motor with compound cage rotor(IMCCR). In this paper, the preparation of three kinds of Fe-Cu alloy is introduced. The influence of its microstructures, hardness and impact toughness is studied by using metalloscope and scanning electron microscope. Meanwhile, physical propertie such as resistivity, and B-H curve is tested by using magnetic testing device and bridge circuit. The influence of carbon content changing on microstructure and performance of Fe-Cu alloy is analysised, which has positive significance to the new type material using in motor.

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Cavellec, Myriam, Didier Riou, Cyril Ninclaus, Jean-Marc Grenèche et Gérard Férey. « [Fe4(PO4)4F2(H2O)3] · [C6H14N2] or ULM-12, the first magnetic ferric phosphate with an open structure : Hydrothermal synthesis, structure, and magnetic propertie ». Zeolites 17, n^o 3 (septembre 1996) : 250–60. http://dx.doi.org/10.1016/0144-2449(96)00008-5.

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Krupa, M. M. « Magnetic and magneto-optical properties of Fe3O4 and NiFe2O4 nanoparticlesMagnetic and magneto-optical properties of Fe3O4 and NiFe2O4 nanoparticles ». Functional materials 21, n^o 1 (30 mars 2014) : 15–20. http://dx.doi.org/10.15407/fm21.01.015.

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Lin Jiaqi, 林家齐, 倪海芳 Ni Haifang, 王晨 Wang Chen et 雷清泉 Lei Qingquan. « Poly (Ethylene Terephthalate) Electronic Structural and Optical Propertie from First Principles Calculations ». Acta Optica Sinica 30, n^o 11 (2010) : 3239–43. http://dx.doi.org/10.3788/aos20103011.3239.

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Meier, Wolfgang, et Heino Finkelmann. « Liquid Crystal Elastomers with Piezoelectric Properties ». MRS Bulletin 16, n^o 1 (janvier 1991) : 29–31. http://dx.doi.org/10.1557/s0883769400057870.

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During the last few years, liquid crystalline elastomers (LCEs) have been systematically produced by cross-linking liquid crystalline side-chain polymers. In these networks, a liquid crystalline molecule is fixed at each monomeric unit. LCEs exhibit a novel combination of properties. Due to liquid crystalline groups, they show anisotropic liquid crystalline properties similar to conventional liquid crystals (LCs); but due to the three-dimensional network-structure of the polymer chains, they show typical elastomer properties, such as rubber elasticity or shape stability. One exceptional property of this combination is demonstrated when a mechanical deformation to the LCE causes macroscopically uniform orientation of the long molecular axis of the LC units (the so-called “director”).This response of the LC-phase structure to an applied mechanical field is similar to the effect of electric or magnetic fields on low molecular weight liquid crystals (LMLC), as illustrated in Figure 1. Figure la shows an undeformed LCE. Because of the non-uniform orientation of the director, the sample scatters light strongly so the elastomer is translucent like frosted glass. On the other hand, applying a mechanical field the director becomes uniformly aligned and the sample is transparent (Figure 1b). Such a macroscopically ordered rubber exhibits optical properties very similar to single crystals. These propertie s of LCEs offer new prospects for technical application, e.g., in nonlinear and integrated optics.

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Marita, Yusrini, et Iskandar Idris Yaacob. « G-9 EFFECT OF THICKNESS ON MAGNETIG PROPERTIES OF NANOSTRUCTURED NiFe FILMS(Session : Fuel Cell/Magnet) ». Proceedings of the Asian Symposium on Materials and Processing 2006 (2006) : 135. http://dx.doi.org/10.1299/jsmeasmp.2006.135.

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Song, Hongseon, Dokyoung Kim, Younsoo Kim, Hyungsuk Jung, HanJin Lim, Seunghyup Lee et Kijung Yong. « Improvement of the electrical and interfacial propertie of TiN/ZrO2 by a modulated atomic layer deposition process with controlled O3 dosing ». Thin Solid Films 675 (avril 2019) : 153–59. http://dx.doi.org/10.1016/j.tsf.2019.02.040.

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Fuentes, M. A. E., H. Camacho et L. Fuentes. « Propiedades de acoplamiento eléctrico y magnético : cristales y policristales ». Boletín de la Sociedad Española de Cerámica y Vidrio 40, n^o 4 (30 août 2001) : 267–74. http://dx.doi.org/10.3989/cyv.2001.v40.i4.735.

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Shalayev, R. V. « Structure and magnetic properties of Ni-N nanofilms ». Functional Materials 21, n^o 2 (30 juin 2014) : 233–36. http://dx.doi.org/10.15407/fm21.02.233.

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Zhao, H., X. Li, H. Zhao et Y. Wang. « Effect of manganese doping on the magnetic and magnetocaloric properties of zinc ferrite ». Materiali in tehnologije 53, n^o 6 (19 décembre 2019) : 891–95. http://dx.doi.org/10.17222/mit.2019.089.

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Thèses sur le sujet "Magnetic propertie"

Ben, ghzaiel Tayssir. « Synthèse, caractérisation et étude des propriétés magnétiques et diélectriques de nanocomposites Polyaniline/hexaferrite pour l'absorption des micro-ondes ». Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLN003/document.

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Ces travaux de thèse consistent à élaborer des nanocomposites Polyaniline/hexaferrite pour l’absorption des micro-ondes. L’idée principale est la mise en œuvre de matériaux composites à base de polymères conducteurs intrinsèques telle la Polyaniline que nous avons dopée avec différents types d’acides (HCl, CSA, NSA et TSA…) et l’hexaferrite de baryum de type magnétoplombite (M) stœchiométrique ou substitué. Au niveau de l’hexaferrite de baryum, la substitution du Fe3+ s’est faite par les ions Al3+, Bi3+, Cr3+ et Mn3+.L’hexaferrite de baryum et les hexaferrites substitués par les différents ions cités ci-dessus ont été synthétisés par voie hydrothermale dynamique en faisant varier divers paramètres au cours de la synthèse (pH, température, temps, rapport [OH-]/[NO3-]…).L’élaboration des composites Polyaniline/hexaferrite (pur ou substitués) a été effectuée par polymérisation oxydative en utilisant plusieurs techniques de synthèse : la polymérisation chimique en solution (en tenant compte de la nature de l’acide utilisé) avec ou sans agitation (Aqueous-Based Polymerization with or without stirring) et la polymérisation oxydative par voie solide (Solid-Based Polymerization). L’optimisation de ces différentes techniques de synthèse après caractérisations physicochimiques (DRX, FTIR, ATG, MEB, EDX), diélectriques (ε’, ε’’, σdc) et magnétiques (Mr, Ms, Hc, Tc, µ’, µ’’) des échantillons, a montré que la polymérisation par voie solide se trouve la méthode la plus facile, économique et respectueuse de l’environnement. Elle est aussi adaptée à la production du composite Pani/BaFe12O19 avec de bonnes propriétés structurales, physiques et magnétiques. L’étude de la substitution du Fe3+ dans le BaFe12O19 par Al3+, Bi3+, Cr3+ et Mn3+ a montré une forte dépendance des propriétés structurales et magnétiques avec la distribution de ces ions dans la maille cristalline hexagonale. En effet, les ions Al3+, Cr3+ et Mn3+ ont une tendance à occuper les sites tétraédriques, alors que le Bi3+ occupe les sites octaédriques. Une augmentation de Hc associée à la taille des cristallites a été observée pour les particules substituées avec l'Al et le Cr alors qu’une modification de l'anisotropie magnetocristalline (fort terme d'ordre supérieur) a été mise en évidence pour les substitutions Bi et Mn, dû à leur grand rayon ionique. L’incorporation des hexaferrites substitués dans la Polyaniline pour obtenir des composites Pani/BaMeFe11O19, où Me = Al, Bi, Cr et Mn, révèle une variation des propriétés électromagnétiques dans la gamme de fréquences allant de 1 à 18 GHz. En effet, ces variations sont dues à la formation de dipôles entre l’ion de substitution et les cations O2- dans le ferrite qui sont responsables de la résonance ferromagnétique, de l'anisotropie magnétocristalline et des interactions avec la matrice polymérique. Le composite Pani/BaFe12O19 présente des absorptions dans la bande X qui se déplacent vers la bande Ku avec la substitution du fer confirmant
This thesis deals with the formulation of Polyaniline/hexaferrite nanocomposite for absorbing electromagnetic waves. The main idea is the process of composite materials based on polymers intrinsic conductors such as polyaniline that we doped with different types of acids (HCl, CSA, NSA, and ... TSA) and barium hexaferrite with magnetoplumbite structure with or without substitution according to desired stoichiometries. In the barium hexaferrite, the substitution of Fe 3+ is made by Al3+, Bi3+, Cr3+ and Mn3+ ions.The barium hexaferrite and its substitutions by different ions mentioned above were synthesized dynamic hydrothermal method by varying various parameters during the synthesis (pH, temperature, time, ratio [OH-]/[NO3-] ...).The elaboration of polyaniline/hexaferrite composite (pure or substituted) was carried out by oxidative polymerization using various synthesis techniques: Aqueous-Based Polymerisation with or without agitation (taking into account the nature of the acid used) (ABP) and Solid-Based Polymerization (SBP). The optimization of these various synthesis techniques after physicochemical (XRD, FTIR, TGA, SEM, EDX), dielectric (ε ', ε' ', σdc) and magnetic (Mr, Ms, Hc, Tc, µ', µ'') characterizations of the samples showed that the solid route is the easiest method, economical and environmentally friendly. It is also suitable for the production of composite Pani/BaFe12O19 with good structural, physical and magnetic properties.The study of the substitution of Fe 3+ in the BaFe12O19 by Al3+, Bi3+, Cr3+ and Mn3+ showed a strong dependence of the structural and magnetic properties with the distribution of these ions in the hexagonal crystal lattice. In fact, Al3+, Cr3+ and Mn3+ ions tend to occupy the tetrahedral sites, while the Bi3+ favoured the octahedral sites. An increase in Hc associated with the small crystallite size observed for particles substituted with Al and Cr and the enhancement magnetocristalline anisotropy (strong higher order term) for Bi and Mn due to their high ionic radius.The incorporation of the substituted hexaferrite in the polyaniline to obtain Pani/BaMeFe11O19 composite, where Me = Al, Bi, Cr and Mn, reveals a variation in electromagnetic properties in the frequency range from 1 to 18 GHz. In fact, these variations are due to the formation of dipoles between the substituting ion and surrounding O2- cations in the ferrite which are responsible for the ferromagnetic resonance, the magnetocrystalline anisotropy and the exchange interaction with the polymer. The composite Pani/BaFe12O19 shows absorption bands at the X-band that shift to the Ku-band with the substitution of iron, confirming the potential of these materials for microwave applications

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Barbosa, Andreia Guedes Santiago. « Estudo de microestruturas magnéticas por microscopia de força magnética ». CNEN - Centro de Desenvolvimento da Tecnologia Nuclear, Belo Horizonte, 2010. http://www.bdtd.cdtn.br//tde_busca/arquivo.php?codArquivo=132.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
A manipulação e o controle das propriedades magnéticas de materiais com pequenas dimensões tem atraído interesse crescente nos últimos anos. Para sistemas magnéticos micrométricos ou submicrométricos, diferentes configurações magnéticas são energeticamente acessíveis. Vórtices magnéticos merecem destaque entre essas configurações e figuram em um grande número de pesquisas tecnológicas que vão desde o armazenamento magnético (VMRAM) até a biofuncionalização de estruturas para o tratamento do câncer. Em uma configuração de vórtice magnético, a energia magnetostática é minimizada por uma configuração de caminho fechado no plano do filme e uma região central com magnetização perpendicular à superfície. A quiralidade (sentido de rotação da magnetização no plano) e a polarização (direção da magnetização na região central) são os dois principais parâmetros que caracterizam um vórtice magnético. Apesar do esforço recente, ainda não se alcançou um entendimento detalhado que permita a manipulação controlada dessas características. Um aspecto importante para a aplicação tecnológica das estruturas de vórtice magnético é a uniformidade e a reprodutibilidade do comportamento de inversão de magnetização da partícula. O tamanho do núcleo do vórtice e o valor da magnetização, fatores que dependem fortemente da anisotropia do sistema, são aspectos relevantes a serem considerados para que as aplicações destas estruturas magnéticas se tornem realidade. Neste trabalho, arranjos regulares de discos multicamadas Co/Pt com diâmetro de 1 e 2 μm e pemalloy com diâmetro na faixa de 5 a 17 μm, ambos com espessura nanométrica, foram investigados por Microscopia de força magnética (MFM) e magnetometria (VSM e PPMS). Um dos objetivos foi investigar a correlação entre a anisotropia magnética nas multicamadas e o tamanho do núcleo do vórtice magnético. Os resultados obtidos demonstraram a presença de estados de vórtice magnético em algumas das amostras estudadas, em função do diâmetro do disco. Além disso, foram estudadas propriedades magnéticas da configuração de vórtices magnéticos desde a nucleação à aniquilação e efeitos de variação de dimensões de disco (diâmetro e espessura) e anisotropia magnética (multicamadas Co/Pt).
The manipulation and control of magnetic properties in size reduced materials have attracted a great interest in the last years. For micrometric or submicron magnetic structures different magnetic configurations are energetically accessible. Magnetic vortex noteworthy belongs to those configurations, and often represents the lowest energy configuration. Nowadays, it appears in a number of technological research ranging from the magnetic storage (VRAM) to the biofunctionalized microdisks for cancer treatment. In a magnetic vortex configuration, magnetostatic energy is minimized by in-plane closed flux domain structure and this curling magnetization turns out of the plane at the centre of the vortex structure. The chirality (direction of rotation of the in-plane magnetization) and polarization (up or down direction of the vortex core) are two topological features that characterize a magnetic vortex. In spite of the great effort on this matter, a controlled manipulation of magnetic vortex features was not reached. A critical aspect for the technological application of magnetic vortex structures is the uniformity and reproducibility of the reversal behavior of the particle magnetization. The vortex core size and the related value of its overall magnetization are also very relevant for the use of such magnetic structures. It is usually considered that the size of the vortex core depends on parameters such as anisotropy, thickness and diameter of the magnetic disk. In this work, regular arrays of Co/Pt multilayers disks with diameter of 1 and 2 μm and pemalloy disks with diameter in the range 5 -17 μm, both nanometer-thick, were investigated by Magnetic Force Microscopy (MFM) and magnetization measurements (VSM and PPMS). The results show the existence of magnetic vortex states for the samples, depending on the disk diameter. Furthermore, it was investigated the magnetic properties of the magnetic vortex, since the nucleation to annihilation, and the effect of variation of disk dimensions (diameter and thickness) and magnetic anisotropy (Co/Pt multilayers).

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Dudchenko, N. O., A. B. Brik, Y. V. Kardanets et O. E. Grechanivskyy. « Influence of Ultrasound Treatment on the Properties of Synthetic Magnetite Nanoparticles ». Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35186.

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The paper describes creation of magnetite nanoparticles under ultrasound treatment and investigation of their phase composition and magnetic properties. Magnetite nanoparticles were synthesized via coprecipitation of Fe+2 and Fe+3 with KOH in aqueous solution at 80°C. It was shown, that ultrasound treatment of solution during the synthesis of magnetite nanoparticles leads to the increasing of size and saturation magnetization obtained nanoparticles. The results of X-ray diffraction measurements show that the synthesized particles consist of magnetite. The size of synthesized magnetite nanoparticles according to Xray diffraction measurements was approximately 10 nm. Saturation magnetization of synthesized magnetite nanoparticles is rather high (37 A*m2/kg). Synthesized magnetite nanoparticles are promising for different medical-biological applications. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35186

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Harrison, Richard John. « Magnetic properties of the magnetite-spinel solid solution ». Thesis, University of Cambridge, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.603779.

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The intrinsic magnetic properties of Fe-bearing solid solutions with the "spinel" crystal structure are determined to a large extent by the processes of non-convergent cation ordering and subsolvus exsolution. The aim of this dissertation is to investigate the interaction between these processes and the magnetic properties of the magnetite-spinel solid solution, with a view to assessing how these factors might influence the acquisition of natural remanent magnetization in other Fe-bearing solid solutions. Temperature and compositional variations in the state of non-convergent cation order are determined using a macroscopic thermodynamic theory, which is calibrated using cation ordering and phase equilibrium constraints from the literature. The cation distribution in the solid solution is calculated for various temperatures and used to derive the ideal variation in saturation magnetization as a function of composition. A compensation point is predicted at approximately 70 mol% MgA1₂O₄, which is confirmed by experimental measurement of the saturation magnetization in synthetic samples. The magnetic properties of synthetic samples are sensitive to rapid changes in the distribution of Fe²⁺ and Fe³⁺ cations which occur during quenching. The kinetics of this ordering process are investigated using the Ginzburg-Landau rate law, which is used to calculate the ordering behaviour during quenching, isothermal annealing and temperature ramp experiments. The calculations show that rapid relaxation of the Fe²⁺-Fe³⁺ distribution occurs when intermediate members of the solid solution are heated above 400°C, and there is hysteresis in the degree of order during repeated heating and cooling cycles. Both these effects are confirmed by measurements of magnetic susceptibility versus temperature.

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Xu, Ming. « Critical current density and time-dependent magnetization of the high transition temperature superconductors ». Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/30033.

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Felton, Solveig. « Tunable Magnetic Properties of Transition Metal Compounds ». Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-5939.

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Raanaei, Hossein. « Tailoring Properties of Materials at the Nanoscale ». Doctoral thesis, Uppsala : Uppsala University, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-107425.

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Svensson, Jacob N. « A Study of the Magnetic Properties of Yb4LiGe4 : Unusual Magnetism ». Thesis, Boston College, 2010. http://hdl.handle.net/2345/1376.

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Thesis advisor: Michael Graf
The R5T4 compounds (R = rare earth, T = Ge or Si) are interesting because the magnetic properties are very sensitively dependent on slight changes in the crystalline structure. Yb5Ge4 is one such compound, with (presumed) antiferromagnetic order occurring at TN = 1.7 K. We are interested in the effects of substituting Li in place of one Yb atom. Previous measurements of the magnetic properties of polycrystalline Yb4LiGe4 using NMR, specific heat, and resistance measurements at temperatures down to 0.5 K and in magnetic fields up to 4 Tesla were made to compare results with the parent compound. The resistance measurements showed a maximum at 1.1 K, which may indicate the onset of magnetic order. Thus we performed μSR measurements on Yb4LiGe4 and Yb5Ge4, and analysis of the data confirmed magnetic ordering (possibly antiferromagnetic) at 1.1 K. The μSR measurements also revealed a dependence on the magnetic history of the sample. Currently we are studying the pressure dependence of the (presumed) Néel Temperature in order to explore whether increased pressure can drive the TN to 0 K, and results will be discussed
Thesis (BS) — Boston College, 2010
Submitted to: Boston College. College of Arts and Sciences
Discipline: Physics Honors Program
Discipline: Physics

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Han, Man Huon. « Development of synthesis method for spinel ferrite magnetic nanoparticle and its superparamagnetic properties ». Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26465.

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Thesis (Ph. D.)--Chemistry and Biochemistry, Georgia Institute of Technology, 2009.
Committee Chair: Z. John Zhang; Committee Member: Angus Wilkinson; Committee Member: C P Wong; Committee Member: E. Kent Barefield; Committee Member: Mostafa El-Sayed. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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Virdee, D. « The influence of magnetostatic interactions on the magnetic properties of magnetite ». Thesis, University of Edinburgh, 1999. http://hdl.handle.net/1842/14612.

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The effect of magnetostatic interactions on the magnetisation structure and magnetic properties of magnetite grains for the size range 0.03 - 0.15 microns has been examined. The understanding of magnetostatic interactions is important because magnetite that occurs naturally by some precipitation process and in sedimentary rocks containing magnetosomes may form as magnetostatic interacting clumps of grains. This has implications in the way we perceive magnetic signals are recorded in rocks, bacterial magnetosomes found in sedimentary rocks, and also in magnetic recording media. The examination of magnetostatic interactions has been achieved by using a three-dimensional micromagnetic model which considers arrays of 4x4x4 cubic magnetite grains with uniaxial shape anisotropy and arrays of 6x6 or 4x4 cubic grains, arranged analogous to arrays of particles that may be produced by a method of electron beam lithography. The grains have a maximum spacing of one grain width, when they are seen to be non-interacting: or a minimum where they are almost touching, when they are interacting. Using this method it is possible to see how grain interactions alter the magnetic domain structure of uniform and non-uniform grains. The effect of interactions on bulk properties, such as coercivity and remanence can be examined from simulated hysteresis cycles. Properties are examined when the grains are arranged within the arrays such that their easy axes of magnetocrystalline anisotropy are aligned parallel with every other grain in the array, and in the case where the axes are in a randomly differing orientation from every other grain within the array. Hysteresis parameters for non-interacting and interacting arrays of grains are calculated, and these theoretical values are compared with previous theoretical micromagnetic models and experimental work. The results from this study are in good agreement with previous work.

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Livres sur le sujet "Magnetic propertie"

R, Fickett F., dir. Units for magnetic properties. Boulder, Colo : U.S. Dept. of Commerce, National Bureau of Standards, 1985.

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Koichi, Itoh, et Kinoshita Minoru, dir. Molecular magnetism : New magnetic materials. Tokyo : Kodansha, 2000.

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Guimarães, Alberto Passos. Magnetism and magnetic resonance in solids. New York : Wiley, 1998.

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author, Rodewald Werner, dir. Magnetic materials : Fundamentals, products, properties, and applications. Erlangen : Publicis, 2013.

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Quantum theory of magnetism : Magnetic properties of materials. 3^e éd. Berlin : Springer, 2007.

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Sandoval, Otilio Arturo Acevedo. La piedra imán del cerro Cangandhó, Zimapán, Hidalgo. Pachuca, Hidalgo, México : Universidad Autónoma del Estado de Hidalgo, 2007.

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Sandoval, Otilio Arturo Acevedo. La piedra imán del cerro Cangandhó, Zimapán, Hidalgo. Pachuca, Hidalgo, México : Universidad Autónoma del Estado de Hidalgo, 2007.

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C, Radhakrishnamurty. Magnetism and basalts. Bangalore : Geological Society of India, 1993.

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Sandoval, Otilio Arturo Acevedo. La piedra imán del cerro Cangandhó, Zimapán, Hidalgo. Pachuca, Hidalgo, México : Universidad Autónoma del Estado de Hidalgo, 2007.

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Solid-state magnetism. New York : Van Nostrand Reinhold, 1991.

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Chapitres de livres sur le sujet "Magnetic propertie"

Jiles, David. « Magnetic Properties ». Dans Introduction to Magnetism and Magnetic Materials, 89–106. Boston, MA : Springer US, 1991. http://dx.doi.org/10.1007/978-1-4615-3868-4_5.

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Sirdeshmukh, D. B., L. Sirdeshmukh, K. G. Subhadra et C. S. Sunandana. « Magnetism III : Magnetic Symmetry and Magnetic Structures ». Dans Electrical, Electronic and Magnetic Properties of Solids, 321–60. Cham : Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-09985-9_10.

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Dionne, Gerald F. « Electromagnetic Properties ». Dans Magnetic Oxides, 273–342. Boston, MA : Springer US, 2009. http://dx.doi.org/10.1007/978-1-4419-0054-8_6.

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Lovejoy, David. « Magnetism and magnetic properties of materials ». Dans Magnetic Particle Inspection, 321–43. Dordrecht : Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1536-0_12.

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Koper, G. H. M., et Marten Terpstra. « Methods to Enhance the Magnetic Properties of Magnets and Magnetic Materials ». Dans Improving the Properties of Permanent Magnets, 10–70. Dordrecht : Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3668-6_2.

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Blundell, Stephen J. « Concepts in Magnetism ». Dans Springer Proceedings in Physics, 39–62. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-64623-3_2.

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AbstractI review some general concepts in magnetism including the nature of magnetic exchange (direct, indirect and superexchange), and how exchange interactions play out in multiple spin systems. The nature of atomic orbitals and the way in which they interact with the spin system is also considered. Several examples are also treated, including the Jahn–Teller interaction and its role in the properties in layered manganites.

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Dionne, Gerald F. « Magneto-Optical Properties ». Dans Magnetic Oxides, 343–84. Boston, MA : Springer US, 2009. http://dx.doi.org/10.1007/978-1-4419-0054-8_7.

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Dionne, Gerald F. « Spin Transport Properties ». Dans Magnetic Oxides, 385–459. Boston, MA : Springer US, 2009. http://dx.doi.org/10.1007/978-1-4419-0054-8_8.

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Merkulov, I. A. « Non-Magnetic Magnetic Polaron ». Dans Optical Properties of Semiconductor Nanostructures, 269–78. Dordrecht : Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-4158-1_28.

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Fukushima, Kimichika. « Magnetic Properties ». Dans Hartree-Fock-Slater Method for Materials Science, 121–27. Berlin, Heidelberg : Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/3-540-31297-8_5.

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Actes de conférences sur le sujet "Magnetic propertie"

Song, Pan, Xiaoying Tang, ShaoJun Wang, Bin Ren, Yantian Zuo et Jielu Wang. « A Study on the Magnetic Distribution of Nd-Fe-B Permanent Magnets in Pipeline in Line Inspection Tool ». Dans ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-84529.

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The pressure pipeline in line inspection technology is the most effective nondestructive testing method to detect the quality of buried oil and gas pipelines at present. In line inspection tool usually uses magnetic flux leakage (MFL) technology to detect the change of leakage magnetic field to detect pipeline defects. Permanent magnets magnetize the wall of the pipeline as an excitation. During the detection process, the magnetic field performance of permanent magnets is required to be high. At the same time, the magnetic performance of the permanent magnet in the magnetic cleaning pipe also determine the cleaning effect inside the pipeline. In this paper, the magnetic distribution of permanent magnets is studied and the Nd-Fe-B permanent magnets with the best magnetic properties are taken as the objects. The finite element simulation is used to optimize the shape of the permanent magnets with better magnetic distribution, and the magnetic intensity factors of the preferred cylindrical permanent magnets are analyzed. In addition, three experiments of the influence of temperature, the influence of the ferromagnetic combination, and the influence of the environment medium are conducted. As a result, the relationship between the magnetic intensity of the Nd-Fe-B permanent magnets and the factors is obtained. The conclusion is of great significance to the design and research of permanent magnetic circuit in line inspection magnetization device.

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Tian, Zongjun, Shangdong Li, Youwei Du et Yinhui Huang. « Preparation and Magnetic Properties of the Exchange Coupling NdFeB Nanocomposited Permanent Magnets ». Dans 2007 First International Conference on Integration and Commercialization of Micro and Nanosystems. ASMEDC, 2007. http://dx.doi.org/10.1115/mnc2007-21156.

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The effect of indium additions on the microstructures and magnetic properties of Nd9Fe85−xB6Inx (x = 0–2) nanocomposites prepared by melt spinning was investigated. It was found that a certain amount of indium added to Nd9Fe85B6 magnets enhances the hard magnetic properties. The coercivity and remanence ratio of the magnet with 0.5 at.% indium increases from 405kA/m (no indium) to 465kA/m and from 0.7 to 0.86 respectively. Squareness of its hysteresis loop is also improved greatly. The optimum energy product (BH)max increases remarkably from 95kJ/m3 to 145kJ/m3. The origin for those enhancements is mainly attributed to the magnetically softened grain boundaries and enhanced crystallographical coherency by indium addition. The magnetic annealing is found to be helpful to enhance the coherency and coupling between hard and soft phases.

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Eshaghi, Mehdi, Ramin Sedaghati et Subash Rakheja. « A Hybrid Model for Characterizing Pre-Yield Properties of MR Fluids ». Dans ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-36785.

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This study aims to present a field dependent phenomenological model to characterize the Magneto-Rheological (MR) fluid in the pre-yield region under varying frequency and applied magnetic field. Systematic analytical and experimental studies are proposed to formulate a hybrid model for representing complex shear modulus of a typical MR fluid (MR 122EG from Lord Corporation) as a function of both applied magnetic field and frequency. Two fully treated MR based sandwich beams with aluminum and copper face layers and MR fluid as the core layer are designed and fabricated. Uniform magnetic flux across the sandwich beam is provided using two permanent magnets. The fabricated MR based sandwich beams are then tested on an electrodynamic shaker under sweep sine excitation and different applied magnetic field to realize the effect of external excitation frequency and applied magnetic field on the stiffness and damping properties of the structure. The finite element model based on classical plate theory is also developed to analyze vibration response of the designed MR based sandwich beams incorporated with MR fluid. Then, by correlating the finite element results with those of the experiment, the frequency and field dependent complex shear modulus of the MR fluid is identified.

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Hu, Chengzhi, Mingyuan Gao, Zhenzhi Chen, Honghai Zhang et Sheng Liu. « Novel Magnetic Propulsion System for Capsule Endoscopy ». Dans ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-10432.

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For the purpose of realizing the noninvasive exploration of gastrointestinal tract, a novel magnetic propulsion system is proposed, which includes a patient support, a magnet assembly with two groups of permanent magnets positioned oppositely, and a magnet support. The proposed approach exploits permanent magnet and coupling movement of multi-axis components to generate quasi-static magnetic field for controlling the position, orientation, and movement of a self-propelled robotic endoscope in the gastrointestinal tract. By driving the five coupling axes, the proposed magnetic propulsion system is capable of steering the capsule endoscope through the intestinal tract in multi-directions of 2D space. Experiments in simulated intestinal tract are conducted to demonstrate controlled translation, rotation, and rototranslation of capsule endoscope. Finite Element Method is used to analyze navigation system’s mechanical properties and the distributions of magnetic field. The proposed technique has great potential of enabling the application of controlled magnetic navigation in the field of capsule endoscopy.

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N D, Senthil Ram, Rajeshkumar ramasamy, Seenuvas Sivathanu, Sathishkumar Manoharan, Thulasirajan Ganesan, Muruganandam Radhakrishnan et Praveen Chakrapani Rao. « Design Analysis of Multipole Sensor Magnet for Peel off Strength of the Plastic Bonded Magnet from the Metal Cup ». Dans International Conference on Advances in Design, Materials, Manufacturing and Surface Engineering for Mobility. 400 Commonwealth Drive, Warrendale, PA, United States : SAE International, 2020. http://dx.doi.org/10.4271/2020-28-0493.

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<div class="section abstract"><div class="htmlview paragraph">In this paper, the study of plastic bonded magnetic material is studied for the surface adhesion of the material on to the surface of a metal cup. The bonded magnetic material is formed as a mixture of plastic material blended with ferrite or NdFeB Magnetic powder. The amount of magnetic material used is confined to the magnetic property of the magnetic powder that can exhibit the required magnetic performance as higher rotational speed and higher temperature. The magnet is injection moulded onto the outer circumference of the metal cup. The magnet is bonded onto the metal surface which is of cup shape and this assembly is magnetized to form a multipole magnet. This multipole magnet is designed to withstand high centrifugal force during the magnet rotation at higher rpm say 40000 rpm. For improving the adhesion properties with the two dissimilar material, the plastic bonded magnetic material and metal cup with zinc plating, the design on the metal cup is probed in detail and simulation has been carried out using FEA software. The adhesion of this two material binding is to be confined and confined to the properties of the plastic material in the mixture of the plastic bonded magnetic material.</div></div>

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Curtin, Paul R., Steve Constantinides et Patricia Iglesias Victoria. « Fracture Toughness of Samarium Cobalt Magnets ». Dans ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-53435.

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Samarium Cobalt (SmCo) magnets have been the magnet of choice for a variety of industries for many years due to their favorable magnetic properties. Their high coercivity, combined with a low temperature coefficient, make them the ideal permanent magnet for demanding high temperature applications. One of the biggest concerns with rare earth magnets is their brittleness. Samarium Cobalt magnets in particular are prone to fracturing during machining and assembly. In manufacturing, great care must be taken to avoid chipping or fracturing these magnets due to their brittle nature. There are two main grades of Samarium Cobalt magnets, 1:5 and 2:17. These ratios define the nominal ratio of rare earth to transition metal content. In this paper, an investigation is performed on the fracture toughness of permanent magnets based on the Samarium Cobalt 2:17 composition. Various techniques are used to characterize the microstructure of the material, and quantify the material properties. Optical microscopy is used to characterize the grain structure of the material and quantify the porosity of the material after sintering. By comparing the average grain size and fracture toughness of several samples, grain size was shown to not affect fracture toughness in standard material. Latent cracks in defective material showed no preference to follow grain boundaries, oxides inclusions or voids. River marks in fracture surfaces are seen through scanning electron microscopy, confirming the transgranular cracking pattern seen by Li et al [1]This suggests that the toughness of the material is an inherent property of the main phase, not of grain boundaries or contaminants. Samarium Cobalt magnets exhibit both mechanical and magnetic anisotropy due to the alignment of their crystal structure in the manufacturing process. Using Palmqvist indentation crack techniques, the magnetic orientation of the grains was seen to greatly influence the direction of crack propagation from the tip of the indenter. Measurements of fracture toughness using this technique produce highly scattered data due to this anisotropic nature of the material. Specimens loaded with the indenter axis parallel to the direction of orientation show normal Palmqvist cracks, while specimens loaded perpendicular to the direction of magnetization exhibit crack propagation initiating from the faces of the indenter. To better quantify the material’s brittleness, fracture testing is performed on specially prepared samples to obtain an absolute measure of fracture toughness (K1c). Results show that SmCo is measurably weaker than other magnetic materials such as neodymium iron boron magnets[2]. Furthermore, neither relative concentration of Samarium nor source of raw material show notable effect on the fracture toughness of the material.

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Victoria, Patricia Iglesias, Weimin Yin, Surendra K. Gupta et Steve Constantinides. « Microstructural Characterization of Sm-Co Magnets ». Dans ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-37106.

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Samarium cobalt permanent magnets have been widely used for their excellent intrinsic magnetic properties such as very high Curie temperature, high anisotropy fields and most importantly excellent temperature coefficients of induction and coercivity. These materials have continuing industrial interest especially for applications operating at elevated temperatures and in the presence of high demagnetizing fields, such as particle accelerators, high frequency traveling wave tubes (TWTs), servo-motors and automotive and aerospace applications. An area of opportunity for improving performance of SmCo magnets is increasing magnet toughness — resistance to fracture. Like all other sintered rare earth magnetic materials, SmCo magnets are based on intermetallic compounds which are intrinsically brittle and can crack in the course of fabrication, machine work, and installation in the application. Increased toughness would also reduce handling sensitivity of magnetized magnets. For many years, studies on SmCo magnets have been focused on their magnetic properties, but the mechanical characteristics, strengthening and toughening mechanisms have been rarely reported. Understanding the phase and structural transformations induced in the SmCo magnets during the manufacturing process offers insight into potential modifications — chemical or processing-related. In this study, microstructural characterizations of 1:5 and 2:17 Sm-Co magnets were carried out using optical and scanning electron microscopes. In scanning electron microscopy (SEM), backscattered electron imaging and energy dispersive X-ray (EDX) microanalysis were used to investigate different phases and oxides. Finally, crystal structure of the magnets was studied using an X-ray diffractometer (XRD). The study correlates the microstructure characterization with the thermal processing history of different grades of SmCo magnets.

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Walmer, Marlin S., Christina H. Chen et Michael H. Walmer. « A New Class of Permanent Magnetic Materials for High Temperature Applications ». Dans ASME Turbo Expo 2000 : Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/2000-gt-0412.

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A new class of Sm2TM17 type permanent magnetic materials has been developed to meet the needs of applications at high temperatures. These magnets have high to moderate energy product (BH)max, high intrinsic coercivity iHc with low temperature coefficient of iHc, and straight-line demagnetization curves up to 550°C. A straight-line demagnetization curve provides greater design flexibility and facilitates reduced size and weight of magnetic circuits. A straight-line demagnetization curve is even more important for dynamic and highly loaded applications where high demagnetization forces are encountered. Examples of dynamic applications include generators, motors, jet engine start generators, and electro-magnet actuators. Highly loaded applications include the periodic arrangement of magnets in traveling wave tubes. A new symbol, TM, is introduced, which is defined as the maximum temperature at which the demagnetization curve is a straight line. An important feature of these magnets with high TM is a lower temperature coefficient of iHc, β, which gives these magnets a great resistance to thermal demagnetization and leads to better performance at high temperatures. This paper reports the magnetic properties vs. temperature for this new class of magnets, and compares them to the best conventional magnets, in order to illustrate the improvements that have been made.

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Seat, Han C., et Ian A. Watson. « Laser welding of magnetic materials ». Dans The European Conference on Lasers and Electro-Optics. Washington, D.C. : Optica Publishing Group, 1998. http://dx.doi.org/10.1364/cleo_europe.1998.cmb7.

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Industrial sectors with interest in welding magnetic materials include the aerospace, electrical and defence industries [1]. The effects of CO2 laser welding and high temperatures (i.e. above the Curie temperature) on the magnetism of ferromagnetic materials were investigated. A 1.2 kW MFKP CO2 laser was used to weld the magnetic material at a constant power of 1 kW in the CW mode, for different welding translation velocities. Figure 1 shows a schematic of the magnetic field measurement system. This consisted of two orthogonal translation tables and an RS miniature Hall effect Sensor (HES), attached to an outlying platform from the larger translation table. The x-y motion was controlled via a microprocessor so that the HES was translated over the entire surface of the welded magnets (2 Alcomax magnets: 8% Al, 11.5% Ni, 21% Co, 4% Cu, Fe). The signal from the HES was signal conditioned and fed into a data acquisition card located in the PC. The magnetic field strength over the laser weld and surface of the specimen was measured before welding, immediately after welding and 3 days after welding. Figure 2 shows the spatial differences in the magnetic properties of the sample immediately after welding and Figure 3 the corresponding data 3 days after welding. The magnetisation of the weld pool and HAZ was reduced immediately after welding; 3 days later, during which the samples were isolated, magnetism recovered over the specimen except in the weld zone where it had been damaged and stayed unrecovered. A high translation velocity maximised the remagnetisation process and reduced the demagnetised zone and HAZ.

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Song, Haiyan, Zhengong Zhou, Lifu Liang et Zongmin Liu. « Generalized Variational Principles of Electro-Magneto-Thermo-Elasto-Dynamics ». Dans ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-10681.

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Based on coupled properties of electricity, magnetism, heat and force, it is hard to solve the material’s electric behavior, magnetic behavior, temperature field, stress distribution and deformation distribution under the action of all kinds of external fields in usual way. It is necessary that the problems are solved by numerical methods. However variational principle is the foundation of these numerical methods which were widely used. In this paper, the generalized variational principles of electro-magneto-thermo-elasto-dynamics are established by variational integral method. And these variational principles can be degenerated into variational principles of simple coupled properties materials, which offer theoretical support for numerical methods of coupled problems of electro-magneto-thermo-elasticity.

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Rapports d'organisations sur le sujet "Magnetic propertie"

Rodger, E., et V. Badea. MAGNETIC PROPERTIES OF THE H-10 MAGNET. Office of Scientific and Technical Information (OSTI), septembre 1989. http://dx.doi.org/10.2172/1150526.

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Andreescu, R., et M. J. O'Shea. Hard Magnetic Properties of Multilayered SmCo/Co Permanent Magnets. Fort Belvoir, VA : Defense Technical Information Center, janvier 2001. http://dx.doi.org/10.21236/ada398436.

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Lambrecht, Walter R. Magneto-Optical Properties of Hybrid Magnetic Material Semiconductor Nanostructures. Fort Belvoir, VA : Defense Technical Information Center, septembre 2007. http://dx.doi.org/10.21236/ada472402.

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Moler, Kathryn A. Magnetic Properties of Nanocrystals. Fort Belvoir, VA : Defense Technical Information Center, novembre 2005. http://dx.doi.org/10.21236/ada441687.

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Goldfarb, R. B., et F. R. Fickett. Units for magnetic properties. Gaithersburg, MD : National Bureau of Standards, 1985. http://dx.doi.org/10.6028/nbs.sp.696.

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Camley, R. E. Magnetic, Electronic, and Thermal Properties of Magnetic Multilayers. Fort Belvoir, VA : Defense Technical Information Center, janvier 1996. http://dx.doi.org/10.21236/ada370040.

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Author, Not Given. (Magnetic properties of doped semiconductors). Office of Scientific and Technical Information (OSTI), janvier 1990. http://dx.doi.org/10.2172/6435513.

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Mielke, Charles H., Vivien Zapf, Jae Wook Kim, Eun D. Mun, Joseph P. Baiardo, Jeremy N. Mitchell, Scott Richmond et Daniel S. Schwartz. Pu doped with Hydrogen : Magnetic Properties. Office of Scientific and Technical Information (OSTI), septembre 2013. http://dx.doi.org/10.2172/1095224.

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Chrzan, D. C. Magnetic properties of surfaces and interfaces. Office of Scientific and Technical Information (OSTI), novembre 1989. http://dx.doi.org/10.2172/7073523.

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Soffa, W. A. The relationship between microstructure and magnetic properties in high-energy permanent magnets characterized by polytwinned structures. Office of Scientific and Technical Information (OSTI), janvier 1993. http://dx.doi.org/10.2172/6633143.

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