US 12,354,626 B2
Magnetic recording device with magnetic element configuration details
Ryo Osamura, Kawasaki Kanagawa (JP); Naoyuki Narita, Funabashi Chiba (JP); Masayuki Takagishi, Tokyo (JP); Yuji Nakagawa, Kawasaki Kanagawa (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 Jan. 29, 2024, as Appl. No. 18/425,544.
Claims priority of application No. 2023-121861 (JP), filed on Jul. 26, 2023.
Prior Publication US 2025/0037736 A1, Jan. 30, 2025
Int. Cl. G11B 5/127 (2006.01); G11B 5/235 (2006.01); G11B 5/31 (2006.01); G11B 5/00 (2006.01)
CPC G11B 5/1278 (2013.01) [G11B 5/235 (2013.01); G11B 5/3116 (2013.01); G11B 5/314 (2013.01); G11B 5/3146 (2013.01); G11B 2005/0005 (2013.01); G11B 2005/0024 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A magnetic recording device, comprising:
a magnetic head, including
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, and a second magnetic layer provided between the first magnetic layer and the second magnetic pole; and
a magnetic recording medium,
the magnetic element including a midpoint between the first magnetic layer and the second magnetic layer in a first direction from the first magnetic pole to the second magnetic pole,
a first ratio r1 and a second ratio r2 satisfying
−0.26×r1+0.60≤r2≤−0.26×r2+0.70,
the first ratio r1 being a ratio of a second distance L2 between the first magnetic pole and the midpoint in the first direction to a first distance L1 between the first magnetic pole and the second magnetic pole in the first direction, and
the second ratio r2 being a ratio of a dynamic coercive force Hc0 of the magnetic recording medium to an average anisotropic magnetic field Hk of the magnetic recording medium.