US 12,087,341 B2
Magnetic recording medium and magnetic read/write apparatus
Chen Xu, Chiba (JP); Lei Zhang, Chiba (JP); Takayuki Fukushima, Chiba (JP); Hisato Shibata, Chiba (JP); Takehiro Yamaguchi, Chiba (JP); Kazuya Niwa, Chiba (JP); Tomoo Shige, Chiba (JP); Hiroaki Nemoto, Chiba (JP); Yuji Umemoto, Chiba (JP); and Hiroshi Koyanagi, Chiba (JP)
Assigned to RESONAC CORPORATION, Tokyo (JP)
Filed by SHOWA DENKO K.K., Tokyo (JP)
Filed on Apr. 30, 2020, as Appl. No. 16/862,809.
Claims priority of application No. 2019-089202 (JP), filed on May 9, 2019.
Prior Publication US 2020/0357436 A1, Nov. 12, 2020
Int. Cl. G11B 5/66 (2006.01); G11B 5/65 (2006.01); G11B 5/73 (2006.01)
CPC G11B 5/73919 (2019.05) [G11B 5/657 (2021.05); G11B 5/658 (2021.05)] 9 Claims
OG exemplary drawing
 
1. A magnetic recording medium comprising:
a substrate;
an underlayer formed on the substrate; and
a magnetic layer formed on the underlayer, wherein
the magnetic layer includes an alloy having a L10 structure,
the underlayer includes
a first underlayer including Mo and Ru, and one or more elements selected from the group consisting of V, W, and Nb, a content of Ru in the first underlayer being in a range of 6 atom % to 15 atom %; and
a second underlayer including a material having a body-centered cubic (BCC) structure, the second underlayer being formed between the first underlayer and the substrate.