公开(公告)号：US20230317110A1

公开(公告)日：2023-10-05

申请号：US18191311

申请日：2023-03-28

Applicant: FUJIFILM Corporation

Inventor： Noriko OYANAGI ,  Tatsuya YAMASHITA

IPC: G11B5/708 ,  G11B5/72

CPC classification number: G11B5/708 ,  G11B5/72

Abstract: Ra measured on a surface of a magnetic layer is 2.5 nm or less, and Δ(HD−HB) between a protrusion height HD with a height of a peripheral base region of 0 nm as a reference, which is measured by AFM, for a region specified as a dark region in a first binarization-processed image of a reflected electron image obtained by imaging the surface of the magnetic layer with SEM and a protrusion height HB with a height of a peripheral base region of 0 nm as a reference, which is measured by AFM, for a region specified as a bright region in a second binarization-processed image of the reflected electron image obtained by imaging the surface of the magnetic layer with SEM, the second binarization processing being performed on a higher gradation side than the first binarization processing, is 0.7 nm or more.

公开(公告)号：US20230360671A1

公开(公告)日：2023-11-09

申请号：US18354336

申请日：2023-07-18

Applicant: FUJIFILM Corporation

Inventor： Noriko OYANAGI

IPC: G11B5/008 ,  G11B5/71 ,  G11B5/706 ,  G11B5/712

CPC classification number: G11B5/00813 ,  G11B5/71 ,  G11B5/70631 ,  G11B5/712

Abstract: 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.

公开(公告)号：US20230101868A1

公开(公告)日：2023-03-30

申请号：US17873728

申请日：2022-07-26

Applicant: FUJIFILM Corporation

Inventor： Noriko OYANAGI ,  Wataru KIKUCHI ,  Akio Tamura

IPC: G11B5/78 ,  G11B5/706 ,  G11B5/714

Abstract: 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.

公开(公告)号：US20210280213A1

公开(公告)日：2021-09-09

申请号：US17186470

申请日：2021-02-26

Applicant: FUJIFILM Corporation

Inventor： Noriko OYANAGI ,  Wataru KIKUCHI

IPC: G11B5/73 ,  G11B5/735 ,  G11B5/706 ,  G11B5/008

Abstract: 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.