Fujifilm Corporation

Noriko Oyanagi

Wataru Kikuchi

Akio Tamura

Junya Sawada

The magnetic recording medium includes a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, in which the magnetic layer includes an abrasive, the abrasive is a carbide, an average primary particle diameter of the abrasive is 10 nm or more and 100 nm or less, and in an electron microscope image of a surface of the magnetic layer, assuming that a total area occupied by the abrasive is 100%, a ratio of an area occupied by the abrasive present in an aggregated state having a maximum Feret diameter of 0.2 μm or more is 50% or more.

Magnetic recording medium, magnetic tape cartridge, and magnetic recording and reproducing device

The magnetic recording medium includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder. An anisotropic magnetic field Hk is 12 kOe or more, a center line average roughness Ra of the surface of the magnetic recording medium on the magnetic layer side is 1.2 nm or less, and a ratio θr of a contact angle θ2 with respect to 1-bromonaphthalene, measured on a surface on the magnetic layer side after a 1,1,1,2,2,3,4,5,5,5-decafluoropentane immersion, to a contact angle θ1 with respect to 1-bromonaphthalene, measured on the surface on the magnetic layer side before the 1,1,1,2,2,3,4,5,5,5-decafluoropentane immersion is 0.95 or less.

Provided are a magnetic tape, a magnetic tape cartridge and a magnetic tape apparatus including the magnetic tape. The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder. An amount of a fluid lubricant extracted from a surface of the magnetic layer after sliding on a magnetic head in an environment of a temperature of 60° C.±1° C. and a relative humidity of 10% is 50% or more of an amount of the fluid lubricant extracted from the surface of the magnetic layer before the sliding, on a mass basis.

Magnetic tape, magnetic tape cartridge, and magnetic tape apparatus

The magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder. A fluorine-containing compound is included in a portion on the non-magnetic support on a magnetic layer side, and a ratio θr of a water contact angle measured on a surface of the magnetic layer after sliding on a magnetic head to a water contact angle measured on the surface of the magnetic layer before sliding on the magnetic head is 0.70 or more.

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Minamiashigara, Japan

Noriko Oyanagi