US 11,862,212 B2
Magnetic recording medium and servo signal recording device
Junichi Tachibana, Tokyo (JP); and Noboru Sekiguchi, Tokyo (JP)
Assigned to Sony Group Corporation, Tokyo (JP)
Appl. No. 17/599,843
Filed by Sony Group Corporation, Tokyo (JP)
PCT Filed Mar. 27, 2020, PCT No. PCT/JP2020/014055
§ 371(c)(1), (2) Date Sep. 29, 2021,
PCT Pub. No. WO2020/203785, PCT Pub. Date Oct. 8, 2020.
Claims priority of application No. 2019-069206 (JP), filed on Mar. 29, 2019.
Prior Publication US 2022/0189506 A1, Jun. 16, 2022
Int. Cl. G11B 5/592 (2006.01); G11B 5/706 (2006.01); G11B 5/78 (2006.01)
CPC G11B 5/5928 (2013.01) [G11B 5/706 (2013.01); G11B 5/78 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A tape-shaped magnetic recording medium, comprising:
a magnetic layer including a servo band, a servo signal being recorded on the servo band, wherein
an index expressed by Sq×Fact.(p−p)/F0(p−p) is 0.42 or more, Sq being a squareness ratio of the magnetic layer in a perpendicular direction, F0(p−p) being a peak-to-peak value of a first magnetic force gradient strength observed by a magnetic force microscope when a servo signal is saturation-recorded on the magnetic layer, Fact.(p−p) being a peak-to-peak value of a second magnetic force gradient strength for the servo signal recorded on the servo band observed by the magnetic force microscope.