US 12,308,051 B2
Magnetic head with multilayer configuration between magnetic poles and magnetic recording device
Yuji Nakagawa, Kawasaki Kanagawa (JP); Masayuki Takagishi, Kunitachi Tokyo (JP); Naoyuki Narita, Funabashi Chiba (JP); and Tomoyuki Maeda, Kawasaki 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 Aug. 1, 2023, as Appl. No. 18/363,573.
Claims priority of application No. 2023-031362 (JP), filed on Mar. 1, 2023.
Prior Publication US 2024/0296863 A1, Sep. 5, 2024
Int. Cl. G11B 5/31 (2006.01); G11B 5/127 (2006.01); G11B 5/235 (2006.01); G11B 5/00 (2006.01)
CPC G11B 5/3146 (2013.01) [G11B 5/1278 (2013.01); G11B 5/235 (2013.01); G11B 5/3133 (2013.01); G11B 5/314 (2013.01); G11B 2005/0005 (2013.01); G11B 2005/0024 (2013.01)] 10 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 fifth magnetic layer provided between the fourth 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,
a fifth non-magnetic layer provided between the fourth magnetic layer and the fifth magnetic layer, and
a sixth non-magnetic layer provided between the fifth magnetic layer and the second magnetic pole,
the sixth non-magnetic layer including at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt and W,
wherein
the first non-magnetic layer includes at least one selected from the group consisting of Ru, Ir, Ta, Rh, Pd, Pt and W,
the fourth non-magnetic layer includes at least one selected from the 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,
the third non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, Al, V and Ag,
the fifth non-magnetic layer includes at least one selected from the group consisting of Cu, Au, Cr, Al, V and Ag,
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,
the second thickness is thicker than a third thickness of the third magnetic layer in the first direction,
a fourth thickness of the fourth magnetic layer in the first direction is thinner than a fifth thickness of the fifth magnetic layer in the first direction,
the first magnetic layer directly contacts the first non-magnetic layer and the second non-magnetic layer,
the second magnetic layer directly contacts the second non-magnetic layer and the third non-magnetic layer,
the third magnetic layer directly contacts the third non-magnetic layer and the fourth non-magnetic layer,
the fourth magnetic layer directly contacts the fourth non-magnetic layer and the fifth non-magnetic layer, and
the fifth magnetic layer directly contacts the fifth non-magnetic layer and the sixth non-magnetic layer.