Composite magnetic material, coil component using same, and power supply device
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsNobuya Matsutani, Takeshi Takahashi, Junichi Kotani
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Abstract
A composite magnetic material includes a plurality of soft-magnetic metal powders, a first oxide that covers a surface of each of the plurality of soft-magnetic metal powders, and a second oxide that covers a surface of the first oxide and is interposed among the plurality of soft-magnetic metal powders each coated with the first oxide. The first oxide has a first recess in a surface, and the second oxide is provided in the first recess. With this configuration, peeling between the first oxide and the second oxide can be prevented, so that the composite magnetic material having high mechanical strength can be provided.
Claims14
A composite magnetic material comprising:
- a plurality of soft-magnetic metal powders;
- a first oxide covering a portion of a first surface of each of the plurality of soft-magnetic metal powders, the first oxide includes a surface having a first recess;
- and
- a second oxide covering a surface of the first oxide,
- wherein the second oxide fills voids between the plurality of soft-magnetic metal powders each coated with the first oxide including the first recess,
- a portion of the first surface of the plurality of soft-magnetic metal powders is in contact with second oxide, and wherein an area ratio A/B is between 0.25 and 4, where A represents a contact area between the first oxide and each of the plurality of soft-magnetic metal powders, and B represents a contact area between the second oxide and each of the plurality of soft-magnetic metal powders.
Dependencies are inferred from the claim text.