Ferromagnetic
Mostrando 1-12 de 173 artigos, teses e dissertações.
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1. Comportamento magnético de materiais por meio da mecânica estatística
Resumo Um problema importante no estudo de materiais magnéticos é saber como esses sistemas se comportam na presença de um campo magnético externo. A resposta para esse problema está na susceptibilidade magnética. Neste trabalho realizamos uma abordagem estatística das propriedades magnéticas dos materiais levando em consideração suas interações
Rev. Bras. Ensino Fís.. Publicado em: 01/12/2019
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2. Iron oxide/titania composites for radar absorbing material (RAM) applications
Resumo Compósitos de óxido de ferro/titânia foram sintetizados pelo método de precipitação. A quantidade de óxido de ferro foi variada nos compósitos. Fase única (anatásio) foi obtida para a fração em massa de 0-20% e três fases (anatásio, magnetita e hematita) foram encontradas para as frações de 30% e 40% de óxido de ferro. O tamanho de cr
Cerâmica. Publicado em: 15/08/2019
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3. Study of the martensitic transition in Ni-Mn-Sn-Ti ferromagnetic shape memory alloys
ABSTRACT In the present work, mechanical spectroscopy measurements as a function of temperature and strain have been performed in (at.%) Ni50Mn37Sn13-xTix (x=0, 0.5 and 2) ferromagnetic shape memory alloys in order both to study martensitic transition phenomenon and also to determine its temperature of appearance. For mechanical spectroscopy measurements, a
Matéria (Rio J.). Publicado em: 19/07/2018
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4. Influence of defects on the irreversible phase transition in the Fe-Pd doped with Co and Mn
ABSTRACT The appearance of BCT martensite in Fe-Pd-based ferromagnetic shape memory alloys, which develops at lower temperatures than the thermoelastic martensitic transition, deteriorates the shape memory properties. In a previous work performed in Fe70Pd30, it was shown that a reduction in defects density reduces the non thermoelastic FCT-BCT transformatio
Matéria (Rio J.). Publicado em: 19/07/2018
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5. Comportamiento magnético del acero AISI 304 en ensayos de tracción uniaxial
ABSTRACT During the magnetization process of a ferromagnetic material, the magnetic domain walls are forced to move due to the magnetic field influence. The domain walls must overcome the stress produced by the pinning sites (grain boundary, dislocations, inclusions, etc.), producing discrete jumps in the magnetization. These jumps can be detected with a sen
Matéria (Rio J.). Publicado em: 19/07/2018
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6. Ruido magnético Barkhausen para el estudio de la anisotropía magnética en aceros inoxidables
ABSTRACT The magnetic Barkhausen noise (MBN) is a phenomenon that occurs in ferromagnetic materials when they are exposed to slowly varying magnetic fields, generating discrete jumps in their magnetization. These jumps are produced by the movement of the magnetic domain walls. They can be detected by a small coil allocated on the sample surface. The movement
Matéria (Rio J.). Publicado em: 19/07/2018
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7. Influence of Pellet Compaction Pressure on the Physical Properties of La0.7Ba0.3MnO3 Manganite
Perovskite manganite La0.7Ba0.3MnO3, synthesized by ionic coordination reaction method (ICR) was compacted into pellets under different compaction pressures (Pc) and sintered at a temperature of 1150°C for 10h under a flow of O2. X-ray diffraction (XRD) data reveal that the samples can present simultaneously two phases - a rhombohedral structure with space
Mat. Res.. Publicado em: 11/12/2017
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8. Structure and Physical Properties of the LaBiFe2O6 Perovskite Produced by the Modified Pechini Method
In this paper the synthesis of the LaBiFe2O6 material by the modified Pechini method is reported. Structural, morphologic, magnetic and optic experimental studies were performed. Rietveld refinement of x-ray diffraction patterns revealed that LaBiFe2O6 crystallizes in an orthorhombic perovskite structure (space group Pnma, # 62). Scanning electron microscopy
Mat. Res.. Publicado em: 24/07/2017
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9. Metallurgical Characterization of API X65 Steel Joint Welded by MIG Welding Process with Axial Magnetic Field
In this work, API X-65 pipeline steel non-conventionally heat treated, to enhance its mechanical resistance, was welded using the Metal Inert Gas (MIG) process with and without the application of low intensity axial magnetic fields (6 mT). Microstructural and mechanical characterization of the welds revealed that the use of the magnetic field during welding
Mat. Res.. Publicado em: 23/03/2017
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10. Modificación de las propiedades estructurales, eléctricas y magnéticas del BiFeO3 por la incorporación de Ba y Nb
Bismuth ferrite (BFO) and Ba-Nb-substituted BFO with compositions Bi1-xBaxFeO3 (x= 0, 0.10, 0.15 y 0.20), BiFe1-yNbyO3 (y= 0, 0.03, 0.06 y 0.09) y Bi1-xBaxFe1-yNbyO3 (x= 0.10 (y= 0, 0.03, 0.06 y 0.09) powders were synthesized using the citrate-gel method. Infrared spectroscopy indicated shifting of Bi/Ba-O and Fe/Nb-O bond vibrations and a structural transit
Quím. Nova. Publicado em: 2017-02
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11. Materiales ferromagnéticos: “¿Cómo es eso que el vector H se da vuelta?”
One of the major difficulties that students find in the basic subjects of Electricity and Magnetism is the understanding of the magnetic properties of matter. In particular, the determination of the directions of magnetic vectors in simple devices constructed with ferromagnetic materials such as magnets, transformers and electromagnets. The confusion is comp
Rev. Bras. Ensino Fís.. Publicado em: 19/01/2017
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12. The Magnetic Tracker with Improved Properties for the Helmet-Mounted Cueing System
ABSTRACT This article highlights both theoretical and experimental experiences in the field of helmet-mounted cueing systems. The current state of these systems is described as optical and hybrid. The adventures of the positioning under local magnetic field are considered, and the directions for further improvement of magnetic technology are identified. A ne
J. Aerosp. Technol. Manag.. Publicado em: 2016-12