The magnetic tape device includes a magnetic tape; and a reproducing head, in which the reproducing head is a TMR head, a center line average surface roughness Ra measured regarding a surface of the magnetic layer of the magnetic tape is equal to or smaller than 2.0 nm, a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050, and a ratio (Sdc/Sac) of an average area Sdc of a magnetic cluster of the magnetic tape in a DC demagnetization state and an average area Sac of a magnetic cluster of the magnetic tape in an AC demagnetization state measured with a magnetic force microscope is 0.80 to 1.30.

The magnetic tape device includes a TMR head as a reproducing head; and a magnetic tape which includes a non-magnetic support, and a magnetic layer including ferromagnetic hexagonal ferrite powder and a binding agent on the non-magnetic support, an XRD intensity ratio (Int(110)/Int(114)) of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00, a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.0 nm, and a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050.

The magnetic tape includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, in which a center line average surface roughness Ra measured regarding the surface of the magnetic layer is equal to or smaller than 1.8 nm, a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the magnetic layer includes an abrasive, and a tilt cos of the ferromagnetic hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation performed by using a scanning transmission electron microscope is 0.85 to 1.00.

The magnetic recording medium has a non-magnetic support and a magnetic layer which is provided on the support and contains ferromagnetic powder and a binder, in which the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the magnetic layer contains an abrasive, an intensity ratio (Int (110)/Int (114)) of a peak intensity Int (110) of a diffraction peak of (110) plane of a crystal structure of the hexagonal ferrite, determined by performing X-ray diffraction analysis on the magnetic layer by using an In-Plane method, to a peak intensity Int (114) of a diffraction peak of (114) plane of the crystal structure is equal to or higher than 0.5 and equal to or lower than 4.0, and a squareness ratio in a vertical direction is equal to or higher than 0.65 and equal to or lower than 1.00. The present invention also provides a method for manufacturing the magnetic recording medium.

The present invention provides a process for production of a magnetic thin film which has insulation properties, serves as a permanent magnet, and has improved residual magnetization in comparison with prior arts, the magnetic thin film, and a magnetic material. When a magnetic thin film 3 is formed, an external magnetic field with a predetermined intensity is applied to a coating liquid containing magnetic particles containing epsilon-type iron-oxide-based compounds which have insulation properties and which serve as a permanent magnet, and the coating liquid is let cured in order to form the magnetic thin film 3. Accordingly, the magnetic particles containing the epsilon-type iron-oxide-based compounds can be fixed while being oriented regularly in a magnetization direction. This realizes the process for production of the magnetic thin film 3 which has insulation properties and which serve as a permanent magnet, the magnetic thin film 3, and a magnetic material 1.

The present invention provides a process for production of a magnetic thin film which has insulation properties, serves as a permanent magnet, and has improved residual magnetization in comparison with prior arts, the magnetic thin film, and a magnetic material. When a magnetic thin film 3 is formed, an external magnetic field with a predetermined intensity is applied to a coating liquid containing magnetic particles containing epsilon-type iron-oxide-based compounds which have insulation properties and which serve as a permanent magnet, and the coating liquid is let cured in order to form the magnetic thin film 3. Accordingly, the magnetic particles containing the epsilon-type iron-oxide-based compounds can be fixed while being oriented regularly in a magnetization direction. This realizes the process for production of the magnetic thin film 3 which has insulation properties and which serve as a permanent magnet, the magnetic thin film 3, and a magnetic material 1.

The magnetic tape has a nonmagnetic layer containing nonmagnetic powder and binder on a nonmagnetic support and a magnetic layer containing ferromagnetic powder and binder on the nonmagnetic layer, wherein a fatty acid ester is contained in at least the magnetic layer, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the ferromagnetic hexagonal ferrite powder has a crystallite volume as determined by X-ray diffraction analysis ranges from 1,000 nm.sup.3 to 2,400 nm.sup.3, and a ratio of the crystallite size D.sub.x(107) obtained from a diffraction peak of a (107) plane to a particle size in a direction of an easy axis of magnetization D.sub.TEM as determined by observation with a transmission electron microscope, D.sub.x(107)/D.sub.TEM, is greater than or equal to 1.1, and SFD in a longitudinal direction of the magnetic tape as calculated with Equation 1: SFD=SFD.sub.25 C.SFD.sub.190 C., ranges from 0.50 to 1.60.

The magnetic tape has a nonmagnetic layer containing nonmagnetic powder and binder on a nonmagnetic support and a magnetic layer containing ferromagnetic powder and binder on the nonmagnetic layer, wherein a fatty acid ester is contained in at least the magnetic layer, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the ferromagnetic hexagonal ferrite powder has a crystallite volume as determined by X-ray diffraction analysis ranges from 1,000 nm.sup.3 to 2,400 nm.sup.3, and a ratio of the crystallite size D.sub.x(107) obtained from a diffraction peak of a (107) plane to a particle size in a direction of an easy axis of magnetization D.sub.TEM as determined by observation with a transmission electron microscope, D.sub.x(107)/D.sub.TEM, is greater than or equal to 1.1, and SFD in a longitudinal direction of the magnetic tape as calculated with Equation 1: SFD=SFD.sub.25 C.SFD.sub.190 C., ranges from 0.50 to 1.60.