Alloy ribbon and magnetic core
US-2021304936-A1 · Sep 30, 2021 · US
Soft magnetic alloy, dust core, and magnetic device
US12500017B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12500017-B2 |
| Application number | US-202217967687-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 17, 2022 |
| Priority date | Oct 21, 2021 |
| Publication date | Dec 16, 2025 |
| Grant date | Dec 16, 2025 |
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Abstract
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A soft magnetic alloy includes a main body and a surface layer. The main body has a soft magnetic alloy composition including Fe and Co. The surface layer is located on a surface side of the main body. A ratio of Co concentration to a sum of Co concentration and Fe concentration in the surface layer is Co/(Fe+Co). A distribution of Co/(Fe+Co) in a thickness direction of the surface layer includes a local minimum point and one or more local maximum points.
First claim
Opening claim text (preview).
What is claimed is: 1 . A soft magnetic alloy comprising: a main body having a soft magnetic alloy composition including Fe and Co; and a surface layer located on a surface side of the main body, wherein a ratio of Co concentration to a sum of Co concentration and Fe concentration in the surface layer is Co/(Fe+Co), and a distribution of Co/(Fe+Co) in a thickness direction of the surface layer includes a local minimum point and one or more local maximum points. 2 . The soft magnetic alloy according to claim 1 , wherein the local minimum point is located closer to a surface side of the surface layer than a first local maximum point as a local maximum point closest to the main body among the one or more local maximum points, and a second local maximum point as a second closest local maximum point to the main body after the first local maximum point is located closer to the surface side of the surface layer than the local minimum point. 3 . The soft magnetic alloy according to claim 1 , wherein the local minimum point is located closest to an alloy center side among the local minimum point and the one or more local maximum points. 4 . The soft magnetic alloy according to claim 1 , wherein the surface layer comprises an oxide phase. 5 . The soft magnetic alloy according to claim 1 , wherein the surface layer comprises an oxide phase including at least one predetermined element selected from Si, Cr, and Al, and the local minimum point exists in the oxide phase. 6 . The soft magnetic alloy according to claim 5 , wherein the oxide phase includes a local maximum point L M max of concentration of the at least one predetermined element, and one of the local maximum points for Co/(Fe+Co) exists closer to a surface side of the surface layer than the local maximum point L M max . 7 . A dust core comprising the soft magnetic alloy according to claim 1 . 8 . A magnetic device comprising the soft magnetic alloy according to claim 1 .
Assignees
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Classifications
Oxides (H01F1/36 and H01F1/38 take precedence) · CPC title
made from particles (H01F27/26 takes precedence) · CPC title
the particles being insulated · CPC title
by macromolecular organic substances · CPC title
mixtures of metallic and non-metallic particles; metallic particles having oxide skin · CPC title
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- What does patent US12500017B2 cover?
- A soft magnetic alloy includes a main body and a surface layer. The main body has a soft magnetic alloy composition including Fe and Co. The surface layer is located on a surface side of the main body. A ratio of Co concentration to a sum of Co concentration and Fe concentration in the surface layer is Co/(Fe+Co). A distribution of Co/(Fe+Co) in a thickness direction of the surface layer includ…
- Who is the assignee on this patent?
- Tdk Corp
- What technology area does this patent fall under?
- Primary CPC classification H01F1/15316. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Dec 16 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).