# US 2026/0229401 A1 · Coil component, and electronic component, semiconductor component, and substrate including coil component > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2026/0229401 A1 - Document ID: US20260229401A1 - Status: Published application - Kind: A1 - Application number: 19/629,974 - Filed: 2026-03-26 - Published: 2026-08-06 - Earliest claimed: 2023-09-28 - Assignees: Murata Manufacturing Co., Ltd. - Applicants: Murata Manufacturing Co., Ltd. - Inventors: Yoshimasa YOSHIOKA; Kenji TOYOSHIMA; Kouji YAMAUCHI - Web page: https://patentgrep.com/patent/US20260229401A1 ## CPC - H01F 17/04: with magnetic core - H01F 27/324: {Insulation between coil and core, between different winding sections, around the coil; Other insulation structures} - H01F 1/14: metals or alloys - H01F 1/153: Amorphous metallic alloys, e.g. glassy metals {(making ferrous amorphous alloys C22C33/003)} - H01F 1/24: the particles being insulated - H01F 17/00: Fixed inductances of the signal type - H01F 17/0006: {Printed inductances (printed coils for dynamo-electric machines H02K3/26; printed circuits H05K)} - H01F 17/0013: {with stacked layers} - H01F 27/255: made from particles (H01F27/26 takes precedence) - H01F 27/292: {Surface mounted devices} - H01F 41/046: {structurally combined with ferromagnetic material} - H01F 2017/0066: {with a magnetic layer} - H01F 2017/048: {with encapsulating core, e.g. made of resin and magnetic powder} - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract A coil component includes an element body including a magnetic layer, and a first coil wiring disposed in the element body. The magnetic layer includes resin, first metal magnetic powder, first iron oxide magnetic powder, and a void portion, and an average particle diameter of the first metal magnetic powder is larger than an average particle diameter of the first iron oxide magnetic powder. ## Claims ### Claim 1 A coil component comprising: an element body including a magnetic layer; and a first coil wiring in the element body, wherein the magnetic layer includes resin, first metal magnetic powder, first iron oxide magnetic powder, and at least one void portion, and an average particle diameter of the first metal magnetic powder is larger than an average particle diameter of the first iron oxide magnetic powder. ### Claim 2 (depends on 1) The coil component according to claim 1, wherein at least one particle of the first metal magnetic powder and at least one particle of the first iron oxide magnetic powder are in contact with each other. ### Claim 3 (depends on 2) The coil component according to claim 2, wherein the at least one particle of the first metal magnetic powder is in contact with at least one particle of the first iron oxide magnetic powder and the at least one void portion. ### Claim 4 (depends on 2) The coil component according to claim 2, further comprising: a first vertical wiring extending from a first end side of the first coil wiring through inside of the element body and exposed on a first main surface of the element body, wherein the at least one particle of the first metal magnetic powder is in contact with at least one of the first vertical wiring and the first coil wiring, the at least one void portion, and at least one particle of the first iron oxide magnetic powder. ### Claim 5 (depends on 4) The coil component according to claim 4, wherein the at least one particle of the first metal magnetic powder is in contact with the first vertical wiring, the at least one void portion, and at least one particle of the first iron oxide magnetic powder. ### Claim 6 (depends on 1) The coil component according to claim 1, wherein the first metal magnetic powder includes Fe in an amount of 95% by mass or more. ### Claim 7 (depends on 1) The coil component according to claim 1, wherein the first metal magnetic powder includes Cu in an amount of from 1% by mass to 5% by mass. ### Claim 8 (depends on 1) The coil component according to claim 1, wherein the first metal magnetic powder includes Fe and two kinds selected from metals other than Fe, and the Fe is included in an amount of from 80% by mass to 90% by mass with respect to the first metal magnetic powder. ### Claim 9 (depends on 8) The coil component according to claim 8, wherein the two kinds are Si and Cr. ### Claim 10 (depends on 9) The coil component according to claim 9, wherein total content of the two kinds is 10% by mass or less with respect to the first metal magnetic powder, and content of the Si is higher than content of the Cr. ### Claim 11 (depends on 1) The coil component according to claim 1, wherein an average particle diameter of the first metal magnetic powder is from 0.5 μm to 2.5 μm, an average particle diameter of the first iron oxide magnetic powder is from 0.01 μm to 0.5 μm, and an average particle diameter of the first metal magnetic powder is 5 times or more an average particle diameter of the first iron oxide magnetic powder. ### Claim 12 (depends on 1) The coil component according to claim 1, wherein in the magnetic layer, a filling rate of the first metal magnetic powder is higher than a filling rate of the first iron oxide magnetic powder. ### Claim 13 (depends on 1) The coil component according to claim 1, wherein the first metal magnetic powder includes at least one insulating coating portion, and the at least one insulating coating portion and at least one particle of the first iron oxide magnetic powder are in contact with each other. ### Claim 14 (depends on 1) The coil component according to claim 1, wherein the first iron oxide magnetic powder includes Fe and O, the Fe is included in an amount of from 60% by mass to 85% by mass, content of the O is high following content of the Fe, and electrical conductivity of the first metal magnetic powder is 10 times or more higher than electrical conductivity of the first iron oxide magnetic powder. ### Claim 15 (depends on 1) The coil component according to claim 1, wherein a linear expansion coefficient of the first metal magnetic powder is larger than a linear expansion coefficient of the first iron oxide magnetic powder. ### Claim 16 (depends on 1) The coil component according to claim 1, wherein the magnetic layer further includes an aggregate portion, the aggregate portion is a portion where second iron oxide magnetic powder is aggregated, an average particle diameter as the aggregate portion is twice or more the average particle diameter of the first metal magnetic powder, and a composition of the second iron oxide magnetic powder is same as a composition of the first iron oxide magnetic powder. ### Claim 17 (depends on 1) The coil component according to claim 1, wherein circularity of the first metal magnetic powder and the first iron oxide magnetic powder is higher than 0.9. ### Claim 18 (depends on 1) The coil component according to claim 1, wherein the magnetic layer further includes second metal magnetic powder. ### Claim 19 (depends on 18) The coil component according to claim 18, wherein the first metal magnetic powder is carbonyl iron-based magnetic powder, the second metal magnetic powder is amorphous alloy-based magnetic powder, and an average particle diameter of the second metal magnetic powder is larger than an average particle diameter of the first metal magnetic powder. ### Claim 20 (depends on 1) A surface mount electronic component comprising the coil component according to claim 1. ### Claim 21 (depends on 1) A semiconductor component comprising the coil component according to claim 1. ### Claim 22 (depends on 1) A substrate comprising the coil component according to claim 1.