High-frequency magnetic material, and method of manufacturing the high-frequency magnetic material
A magnetic material, high frequency technology, applied in the direction of inductor/transformer/magnet manufacturing, inorganic material magnetism, thin material processing, etc., can solve the problem of lack of long-term thermal stability of magnetic characteristics, and achieve the effect of improving long-term thermal stability
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no. 1 Embodiment approach
[0022] Next, the high-frequency magnetic material obtained by the first embodiment of the present invention will be described.
[0023] The high-frequency magnetic material of this embodiment contains metal particles composed of at least one of Fe, Co, or an alloy based on them, and an oxide phase. The oxide phase is a solid solution of a metal oxide having a higher solid solution valence than the metal oxide of the main phase in the main phase composed of a hardly reducible metal oxide.
[0024] Examples of alloys based on Fe and Co (Fe-based alloys, Co-based alloys) include alloys containing at least one of Fe and Co, part of which is substituted with other metals. In addition, it is preferable that the total amount of Fe and Co in such an alloy is 50 atomic % or more of the whole alloy.
[0025] figure 1 It is a schematic cross-sectional view of the thickness direction of the high-frequency magnetic material 3 . The high-frequency magnetic material 3 has magnetic metal p...
no. 2 Embodiment approach
[0050] As crystals constituting high-frequency magnetic materials, in addition to hardly reducible metal oxide crystals and oxides with large valences and metal particles, complex oxides (solid solutions) composed of hardly reducible metals and Fe or Co oxides may be included. crystallization. A high-frequency magnetic material in which such a composite oxide remains constitutes a second embodiment of the present invention. This composite oxide is not an oxide simply mixed with several kinds of oxides and reinforced with a resin, but an oxide containing two or more metals as constituent elements. It is possible to discriminate (analyze) "composite oxides" and "two simple mixed and reinforced oxides" by X-ray diffraction, EPMA (electron probe microanalysis), EDX (energy dispersive X-ray fluorescence spectrometer), etc.
[0051] In addition, in the reduction step described below, the composite oxide composed of a hardly reducible metal, an oxide having a large valence number, a...
no. 3 Embodiment approach
[0055] Next, a method for producing a high-frequency magnetic material according to a third embodiment of the present invention will be described.
[0056] The manufacturing method preferably has the following 2 steps:
[0057] Step 1: Manufacturing a hardly reducible metal oxide powder (A), a metal oxide powder (B) containing at least one of Fe or Co, and an oxide (C) having a large valence The molar ratio of A:B=1:9 to 9:1 with a metal oxide containing at least one kind of Fe or Co is a composite oxide, such as a step of solid solution;
[0058] Step 2: A step of reducing the composite oxide to precipitate metal particles composed of at least one of Fe, Co, or an alloy of the two within the composite oxide particles or at the particle boundaries.
[0059] This production method is a method in which a composite oxide is produced in step 1, and predetermined metal particles are precipitated by reduction in step 2.
[0060] First, step 1 will be described. In step 1, the hardl...
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Abstract
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