US 12,431,163 B2
Magnetic tape, magnetic tape cartridge, and magnetic tape apparatus
Junya Sawada, Minamiashigara (JP); Norihito Kasada, Minamiashigara (JP); Nobuhito Onozuka, Minamiashigara (JP); and Ryosuke Yumiyama, Minamiashigara (JP)
Assigned to FUJIFILM Corporation, Tokyo (JP)
Filed by FUJIFILM Corporation, Tokyo (JP)
Filed on Jun. 28, 2024, as Appl. No. 18/758,977.
Claims priority of application No. 2023-107622 (JP), filed on Jun. 30, 2023; application No. 2024-098021 (JP), filed on Jun. 18, 2024; and application No. 2024-103228 (JP), filed on Jun. 26, 2024.
Prior Publication US 2025/0014601 A1, Jan. 9, 2025
Int. Cl. G11B 5/73 (2006.01); G11B 5/588 (2006.01)
CPC G11B 5/736 (2019.05) [G11B 5/588 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A magnetic tape comprising:
a non-magnetic support; and
a magnetic layer containing a ferromagnetic powder,
wherein Svi obtained by measuring a surface of the magnetic layer with an atomic force microscope and by Equation A is 0.080 or more and 0.130 or less, and
standard deviation σ of the Svi in a width direction of the surface of the magnetic layer is 0.010 or less,

OG Complex Work Unit Math
in Equation A,
Sq is a root-mean-square height Sq specified in ISO 25178,
Vv(h0.8) is a void volume in a region where a load area ratio in a bearing curve is 80% or more and 100% or less, and
A is a measurement region area.