Magnetic Microwires
Mostrando 1-7 de 7 artigos, teses e dissertações.
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1. Tensile Properties and Fracture Reliability of Melt-extracted Gd-rich Amorphous Wires
Gd60Al20Co20 amorphous wires with smooth surfaces and circular cross-sections were fabricated by a melt-extraction technique. The mechanical properties of the extracted microwires were evaluated by tensile tests and their fracture reliability was estimated by using Lognormal and two- or three- parameter Weibull analysis, respectively. The microwires exhibit
Mat. Res.. Publicado em: 17/11/2015
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2. Domain Transformation and MI of Melt-extracted Co68.15Fe4.35Si12.25B13.25Nb1Cu1 Microwires by Cryogenic Joule Annealing
Giant magneto-impedance (GMI) effect and domain transformation for melt-extracted Co68.15Fe4.35Si12.25B13.25Nb1Cu1 amorphous wires have been induced by a cryogenic Joule annealing (CJA) treatment with different DC current amplitude (0~350 mA) for 240s. Experimental results indicate that the maximum GMI ratio ([ΔΖ∕Ζ0]max) achieves to 188.1% with exciting
Mat. Res.. Publicado em: 17/11/2015
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3. Efeito do tratamento térmico na relaxação magnética de microfios amorfos de CoFeSiB recobertos por vidro / Effect joule-heated in the magnetic relaxation amorphous glass-covered microwires
Magnetoimpedância tem provado ser uma excelente ferramenta para estudar a dinâmica de magnetização e a largura de linha da ressonância ferromagnética (FMR) fornece uma maneira conveniente para medir parâmetros de amortecimento em materiais magnéticos. A largura de linha FMR depende do amortecimento magnético intrínseco e adicionais inomogeneidades
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/02/2012
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4. Dinâmica de paredes de domínios em microfios amorfos recobertos por vidro
Amorphous glass-coated microwires are materials with soft magnetic properties suitable for various technological applications, mainly magnetic sensors. One of the outstanding properties of microwires with positive magnetostriction is the magnetic bi-stability, that means, the inversion of the magnetization is done by one magnetic domain wall displacement alo
Publicado em: 2010
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5. Construção de um susceptômetro AC e a susceptibilidade magnética de microfios amorfos recobertos por vidro / Development of an AC susceptometer and magnetic susceptibility of glass covered amorphous microwires
Glass covered microwires are materials with soft magnetic properties suitable to several technological applications, specially in magnetic sensors. The main feature of these wires, with negative magnetostriction, it is the magnetic domain structure, which are studied in several research centers. In this work it was developed an AC susceptometer capable to op
Publicado em: 2010
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6. MAGNETOIMPEDÂNCIA COMO FERRAMENTA PARA A CARACTERIZAÇÃO MAGNÉTICA DE MICROFIOS AMORFOS / MAGNETOIMPEDANCE AS A TOOL TO INVESTIGATE THE MAGNETIC PROPERTIES OF MICROWIRES
The possibility of exploring the magnetic properties of amorphous microwires in technological applications has attracted the attention of the scientific community in the last years. Beyond, the magnetoimpedance effect has been established as a powerful tool to study these properties. In this work we show a study of the magnetic properties of Joule heated gla
Publicado em: 2006
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7. Interações magneticas dipolares entre fios e microfios magneticos
The results of the magnetic dipolar field in an array of amorphous ferromagnetic wires and microwires of composition Fe77,5Si12,5B15 are presented in this dissertation. Due to their peculiar domain structure, in principle, they can be approximated to magnetic dipoles, a11owing the analysis of the magnetostatic field among these macroscopic entities. The stud
Publicado em: 2004