US 12,190,918 B2
Magnetic recording and reproducing device
So Matsuyama, Kanagawa (JP); Norihito Kasada, Kanagawa (JP); and Takuto Kurokawa, Kanagawa (JP)
Assigned to FUJIFILM Corporation, Tokyo (JP)
Filed by FUJIFILM Corporation, Tokyo (JP)
Filed on Jun. 4, 2021, as Appl. No. 17/338,694.
Claims priority of application No. 2020-098439 (JP), filed on Jun. 5, 2020; and application No. 2020-217583 (JP), filed on Dec. 25, 2020.
Prior Publication US 2021/0383827 A1, Dec. 9, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. G11B 5/31 (2006.01); G11B 5/706 (2006.01); G11B 5/714 (2006.01); G11B 5/735 (2006.01)
CPC G11B 5/3116 (2013.01) [G11B 5/70678 (2013.01); G11B 5/714 (2013.01); G11B 5/7356 (2019.05)] 12 Claims
OG exemplary drawing
 
1. A magnetic recording and reproducing device comprising:
a magnetic recording medium;
a recording element; and
a reproducing element,
wherein the recording element is an inductive recording element having a first magnetic pole which generates a magnetic field, and a second magnetic pole which is spaced apart from the first magnetic pole with a write gap interposed therebetween,
a tip width of the first magnetic pole is substantially the same as a tip width of the second magnetic pole,
a reproducing element width of the reproducing element is 0.2 μm or greater and less than 0.5 μm,
the magnetic recording medium has a non-magnetic support, and a magnetic layer containing a ferromagnetic powder, and
a number of recesses, which are present in a surface of the magnetic layer and have an equivalent circle diameter of 0.10 μm or greater and less than 0.20 μm, is 100 to 2,000 per area of 40 μm×40 μm.