US 11,862,214 B2
Magnetic tape, magnetic tape cartridge, and magnetic tape device
Yujin Shibata, Minamiashigara (JP); Norihito Kasada, Minamiashigara (JP); Takuto Kurokawa, Minamiashigara (JP); and So Matsuyama, Minamiashigara (JP)
Assigned to FUJIFILM Corporation, Tokyo (JP)
Filed by FUJIFILM Corporation, Tokyo (JP)
Filed on Sep. 26, 2022, as Appl. No. 17/953,149.
Claims priority of application No. 2021-156586 (JP), filed on Sep. 27, 2021.
Prior Publication US 2023/0099064 A1, Mar. 30, 2023
Int. Cl. G11B 5/78 (2006.01); G11B 5/65 (2006.01); G11B 23/107 (2006.01); G11B 5/584 (2006.01); G11B 5/733 (2006.01); G11B 5/008 (2006.01)
CPC G11B 5/653 (2013.01) [G11B 5/00813 (2013.01); G11B 5/584 (2013.01); G11B 5/733 (2013.01); G11B 5/78 (2013.01); G11B 23/107 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A magnetic tape comprising:
a non-magnetic support; and
a magnetic layer containing a ferromagnetic powder,
wherein an edge portion Ra which is an arithmetic average roughness Ra measured at an edge portion of a surface of the magnetic layer is 1.50 nm or less,
a central portion Ra which is an arithmetic average roughness Ra measured at a central portion of the surface of the magnetic layer is 0.30 nm to 1.30 nm, and
a Ra ratio (central portion Ra/edge portion Ra) is 0.75 to 0.95.