Author
M. Osinalde
Bio: M. Osinalde is an academic researcher. The author has contributed to research in topics: Magnetic field & Amorphous metal. The author has an hindex of 1, co-authored 1 publications receiving 4 citations.
Papers
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TL;DR: In this article, the authors report changes of coercivity, induced magnetic anisotropy, magneto-optical domain structure and frequency dependencies associated with the structural modifications produced by thermal treatments under applied magnetic field (field annealing) in toroidal wound cores of Fe 73.5 Cu 1 Nb 3 Si 15.5 B 7 amorphous alloy.
4 citations
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TL;DR: In this article, a loss-separation fitting model for the compound cores mixed with different mass fractions of FeSi powders was built to analyze the relative loss mechanism and source of each part loss, which indicated that the powder micro-structure design is a promising method to further improve magnetic performances for soft magnetic composites.
60 citations
TL;DR: In this article, the influence of annealing temperature on the soft magnetic properties of the FeSiBCCr magnetic flaky powder cores (MFPCs) has been systematically investigated, and the comparisons were made with the conventional FeSiB and Finemet MFPCs at the same preparation conditions.
28 citations
TL;DR: The magnetic characterization was focused mainly in the Rayleigh region which, influenced by the intergranular coupling, was found to be more efficient in the sample treated for a longer time with a finer nanocrystalline structure.
Abstract: We report on the structural and magnetic characterization of two nanocrystalline Finemet-type magnetic cores. The nanocrystalline structure developed after annealing the amorphous precursor alloy at 550 °C for 30 and 60 min of annealing time. Structural analysis carried out by means of X-ray diffraction providing useful information on the grain size mean and partial volume of the nanocrystalline phase. The magnetic characterization was focused mainly in the Rayleigh region which, influenced by the intergranular coupling, was found to be more efficient in the sample treated for a longer time with a finer nanocrystalline structure.
4 citations
DOI•
01 Dec 2018TL;DR: In this article, a thin layer of SiO2 using dip coating method was applied to a melt-spun Finemet ribbons and the results confirmed an intense in increase of resistivity.
Abstract: In this study, melt-spun Finemet ribbons were coated by a thin layer of SiO2 using dip coating method. Amorphous ribbon prepared by melt spinning method and dip coating were done by using a solution of tetraethylen orthosilicate as a SiO2 precursor, ethanol as solvent and distilled water for hydrolysis. Different thicknesses of SiO2 layer, namely 304, 349, 451, 526 and 970 nm were obtained proportional to the number of dipping. Surface morphology and chemical composition of the coatings were analyzed by using Scanning Electron Microscope equipped with an energy dispersive spectroscope. The results clearly verified the presence of Si and O elements and confirmed the presence of silica layer on the surface of all coated ribbons. Microstructure and surface morphology of samples showed a smooth and brittle layer. Electrical resistivity of the samples was measured with a standard four-point probe device. The results confirmed an intense in increase of resistivity. Average value of electrical resistivity for coated samples was around 104 Ω-m compared to 10-6 Ω-m for Finemet ribbons. Capacity of the samples was evaluated by electronic parameter analyzer device in two different frequencies of 100 kHz and 1000 kHz. Impedance measurements of coated samples in 100 and 1000 kHz showed an increase about 70 and 10 times respectively.