US 11,810,601 B2
Magnetic head including multiple magnetic layers and magnetic recording device
Yuji Nakagawa, Kawasaki (JP); Masayuki Takagishi, Kunitachi (JP); Naoyuki Narita, Funabashi (JP); Tazumi Nagasawa, Yokohama (JP); and Tomoyuki Maeda, Kawasaki (JP)
Assigned to KABUSHIKI KAISHA TOSHIBA, Tokyo (JP); and TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION, Tokyo (JP)
Filed by KABUSHIKI KAISHA TOSHIBA, Tokyo (JP); and TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION, Tokyo (JP)
Filed on Jan. 14, 2022, as Appl. No. 17/575,824.
Claims priority of application No. 2021-125149 (JP), filed on Jul. 30, 2021.
Prior Publication US 2023/0031273 A1, Feb. 2, 2023
Int. Cl. G11B 5/235 (2006.01); G11B 5/127 (2006.01); G11B 5/31 (2006.01); G11B 5/245 (2006.01); G11B 5/00 (2006.01)
CPC G11B 5/235 (2013.01) [G11B 5/1278 (2013.01); G11B 5/31 (2013.01); G11B 5/314 (2013.01); G11B 5/3146 (2013.01); G11B 5/2455 (2013.01); G11B 2005/0024 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A magnetic head, comprising:
a first magnetic pole;
a second magnetic pole; and
a stacked body provided between the first magnetic pole and the second magnetic pole,
the stacked body including
a first magnetic layer,
a second magnetic layer provided between the first magnetic layer and the second magnetic pole,
a third magnetic layer provided between the second magnetic layer and the second magnetic pole,
a first non-magnetic layer provided between the first magnetic layer and the second magnetic layer,
a second non-magnetic layer provided between the second magnetic layer and the third magnetic layer,
a third non-magnetic layer provided between the first magnetic pole and the first magnetic layer, and
a fourth non-magnetic layer provided between the third magnetic layer and the second magnetic pole,
the fourth non-magnetic layer including at least one selected from the group consisting of Cu, Au, Al, V and Ag,
the third magnetic layer including (F100-xCox)100-yEy (TO atomic %≤x≤50 atomic %, 10 atomic %≤y≤90 atomic %), a second element E including at least one selected from the group consisting of Cr, V, Mn, Ti and Sc,
a first magnetic pole length of the first magnetic pole along a second direction being shorter than a second magnetic pole length of the second magnetic pole along the second direction, the second direction being perpendicular to a first direction from the first magnetic layer to the second magnetic layer, and being along a medium-facing surface of the first magnetic pole, and
a first magnetic layer length of the first magnetic layer along a third direction being longer than a second magnetic layer length of the second magnetic layer along the third direction, the third direction being perpendicular to the first direction.