US 12,033,786 B2
Magnetic sheet and coil component using the same
Young Il Lee, Suwon-si (KR); Myoung Ki Shin, Suwon-si (KR); Ji Hoon Hwang, Suwon-si (KR); and Jeong Gu Yeo, Suwon-si (KR)
Assigned to SAMSUNG ELECTRO-MECHANICS CO., LTD., Suwon-si (KR)
Filed by SAMSUNG ELECTRO-MECHANICS CO., LTD., Suwon-si (KR)
Filed on Feb. 16, 2021, as Appl. No. 17/176,713.
Claims priority of application No. 10-2020-0153255 (KR), filed on Nov. 17, 2020.
Prior Publication US 2022/0157513 A1, May 19, 2022
Int. Cl. H01F 27/28 (2006.01); H01F 17/00 (2006.01); H01F 17/04 (2006.01); H01F 27/255 (2006.01); H01F 27/29 (2006.01)
CPC H01F 27/2847 (2013.01) [H01F 17/0013 (2013.01); H01F 17/04 (2013.01); H01F 27/255 (2013.01); H01F 27/292 (2013.01); H01F 2017/048 (2013.01); Y10T 428/32 (2015.01)] 12 Claims
OG exemplary drawing
 
1. A magnetic sheet, comprising:
a resin; and
a plurality of magnetic particles dispersed in the resin, comprising a plurality of first magnetic particles and a plurality of second magnetic particles having an average particle size smaller than an average particle size of the first magnetic particle,
wherein each of the first and second magnetic particles comprises a magnetic powder particle as a core, an insulating layer disposed on a surface of the magnetic powder particle, and a surface-treatment layer disposed on a surface of the insulating layer,
the resin fills spaces between the first and second magnetic particles so that the resin is disposed on the surface-treatment layers of the first and second magnetic particles, and
the surface-treatment layer comprises oleic acid.