US 12,437,779 B2
Magnetic head and magnetic recording device
Yuji Nakagawa, Kawasaki (JP); Naoyuki Narita, Funabashi (JP); Masayuki Takagishi, Kunitachi (JP); Tomoyuki Maeda, Kawasaki (JP); and Tazumi Nagasawa, Yokohama (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 Jul. 8, 2024, as Appl. No. 18/765,906.
Application 18/765,906 is a division of application No. 18/336,085, filed on Jun. 16, 2023, granted, now 12,080,325.
Application 18/336,085 is a division of application No. 17/586,880, filed on Jan. 28, 2022, granted, now 11,721,359, issued on Aug. 8, 2023.
Claims priority of application No. 2021-089833 (JP), filed on May 28, 2021.
Prior Publication US 2024/0363141 A1, Oct. 31, 2024
Int. Cl. G11B 5/21 (2006.01); G11B 5/127 (2006.01); G11B 5/31 (2006.01)
CPC G11B 5/21 (2013.01) [G11B 5/1278 (2013.01); G11B 5/3146 (2013.01)] 17 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 pole and the first magnetic layer,
a third magnetic layer provided between the first magnetic pole and the second magnetic layer,
a first nonmagnetic layer provided between the first magnetic layer and the second magnetic pole,
a second nonmagnetic layer provided between the second magnetic layer and the first magnetic layer, and
a third nonmagnetic layer provided between the third magnetic layer and the second magnetic layer,
the first magnetic layer including (Fe100-xCox)100-y(10 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,
the second magnetic layer including at least one of Fe, Co, or Ni, the second magnetic layer not including the second element, or a concentration of the second element in the second magnetic layer being less than a concentration of the second element in the first magnetic layer,
the third magnetic layer including (Fe100-pCop)100-qEXq (10 atomic % ≤p≤50 atomic %, 10 atomic % ≤q≤90 atomic %), a fourth element EX including at least one selected from the group consisting of Cr, V, Mn, Ti and Sc,
the second magnetic layer not including the fourth element, or a concentration of the fourth element in the second magnetic layer being less than a concentration of the fourth element in the third magnetic layer,
the first nonmagnetic layer including at least one selected from the group consisting of Cu, Ag, Au, Al, and Cr,
the second nonmagnetic layer including at least one selected from the group consisting of Cu, Ag, Au, Al, and Cr, and
the third nonmagnetic layer including at least one selected from the group consisting of Cu, Ag, Au, Al, and Cr.