US 12,190,917 B2
Magnetic head with multilayer configuration between magnetic poles and magnetic recording device
Yuji Nakagawa, Kawasaki Kanagawa (JP); Ryo Osamura, Kawasaki Kanagawa (JP); Masayuki Takagishi, Tokyo (JP); Naoyuki Narita, Funabashi Chiba (JP); Tomoyuki Maeda, Kawasaki Kanagawa (JP); Tazumi Nagasawa, Yokohama Kanagawa (JP); and Kosuke Kurihara, Yokohama Kanagawa (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. 25, 2023, as Appl. No. 18/358,872.
Claims priority of application No. 2023-031363 (JP), filed on Mar. 1, 2023.
Prior Publication US 2024/0296861 A1, Sep. 5, 2024
Int. Cl. G11B 5/235 (2006.01); G11B 5/127 (2006.01); G11B 5/31 (2006.01); G11B 5/00 (2006.01); G11B 5/187 (2006.01); G11B 5/49 (2006.01)
CPC G11B 5/235 (2013.01) [G11B 5/1278 (2013.01); G11B 5/3133 (2013.01); G11B 5/314 (2013.01); G11B 5/3146 (2013.01); G11B 2005/0005 (2013.01); G11B 2005/0024 (2013.01); G11B 5/1272 (2013.01); G11B 5/1875 (2013.01); G11B 5/4992 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A magnetic head, comprising:
a first magnetic pole;
a second magnetic pole; and
a magnetic element provided between the first magnetic pole and the second magnetic pole,
the magnetic element 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 fourth magnetic layer provided between the third magnetic layer and the second magnetic pole,
a first non-magnetic layer provided between the first magnetic pole and the first magnetic layer,
a second non-magnetic layer provided between the first magnetic layer and the second magnetic layer,
a third non-magnetic layer provided between the second magnetic layer and the third magnetic layer,
a fourth non-magnetic layer provided between the third magnetic layer and the fourth magnetic layer, and
a fifth non-magnetic layer provided between the fourth magnetic layer and the second magnetic pole,
the fourth magnetic layer including a first element and at least one of Fe, Co or Ni, the first element including at least one selected from a group consisting of Cr, V, Mn, Ti, N and Sc,
the fourth non-magnetic layer including at least one selected from the group consisting of Cu, Au, Cr, Al, V and Ag, and
the fifth non-magnetic layer including at least one selected from the group consisting of Cu, Au, Cr, Al, V and Ag,
wherein
the first magnetic layer, the second magnetic layer and the third magnetic layer include at least one of Fe, Co or Ni,
the first magnetic layer, the second magnetic layer, and the third magnetic layer do not include the first element, or a concentration of the first element in the first magnetic layer, the second magnetic layer, and the third magnetic layer is lower than a concentration of the first element in the fourth magnetic layer,
the first non-magnetic layer includes at least one selected from a group consisting of Ru, Ir, Ta, Rh, Pd, Pt and W,
the second non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, Al, V and Ag, and
the third non-magnetic layer includes at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt and W,
a second thickness of the second magnetic layer in a first direction from the first magnetic pole to the second magnetic pole is thicker than a first thickness of the first magnetic layer in the first direction,
a third thickness of the third magnetic layer in the first direction is thicker than the first thickness, and
a fourth thickness of the fourth magnetic layer in the first direction is thinner than the third thickness.