Magnetic recording medium, magnetic tape cartridge, and magnetic recording and reproducing device
AssigneeFUJIFILM Corporation
InventorsNoriko OYANAGI, Wataru KIKUCHI
Life of this patent
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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.
Claims18
A magnetic recording medium comprising:
- a non-magnetic support;
- and
- a magnetic layer including a ferromagnetic powder,
- wherein an anisotropic magnetic field Hk is 12 kOe or more,
- a center line average roughness Ra of a surface of the magnetic recording medium on a 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 of the magnetic recording medium, 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 of the magnetic recording medium is 0.95 or less.
Dependencies are inferred from the claim text.