US 12,308,059 B2
Magnetic tape having characterized magnetic layer surface, magnetic tape cartridge, and magnetic tape device
Norihito Kasada, Minamiashigara (JP)
Assigned to FUJIFILM Corporation, Tokyo (JP)
Filed by FUJIFILM Corporation, Tokyo (JP)
Filed on Nov. 30, 2023, as Appl. No. 18/524,342.
Application 18/524,342 is a continuation of application No. 17/954,800, filed on Sep. 28, 2022, granted, now 11,894,033.
Claims priority of application No. 2021-158782 (JP), filed on Sep. 29, 2021.
Prior Publication US 2024/0177734 A1, May 30, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. G11B 5/733 (2006.01); G11B 5/78 (2006.01)
CPC G11B 5/7334 (2019.05) [G11B 5/78 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A magnetic tape comprising:
a non-magnetic support; and
a magnetic layer containing a ferromagnetic powder,
wherein
the non-magnetic support is polyethylene terephthalate, polyethylene naphthalate or polyamide,
a vertical switching field distribution SFD of the magnetic tape is 1.5 or less, and
in an environment with a temperature of 32° C. and a relative humidity of 80%,
a frictional force F45° on a surface of the magnetic layer with respect to an LTO8 head measured at a head tilt angle of 45° is 4 gf to 15 gf, and
a standard deviation of a frictional force F on the surface of the magnetic layer with respect to the LTO8 head measured at each of head tilt angles of 0°, 15°, 30°, and 45° is 10 gf or less.