The magnetic tape includes: a non-magnetic support; a non-magnetic layer including non-magnetic powder and a binding agent on the non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic layer, in which a total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 m, the magnetic layer has a servo pattern, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, an intensity ratio of a peak intensity of a diffraction peak of a (110) plane with respect to a peak intensity of a diffraction peak of a (114) plane 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, and a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00, and a magnetic tape device including this magnetic tape.

The present invention aims at providing a magnetic recording medium that can lower a Curie temperature (Tc) of a magnetic material, without increasing an in-plane coercive force and lowering magnetic properties. The magnetic recording medium is a magnetic recording medium comprising a substrate and a magnetic recording layer, the magnetic recording layer comprising an FePtRh ordered alloy, wherein a Rh content in the FePtRh ordered alloy is 10 at % or less.

A magnetic recording medium includes: a substrate; a first underlayer; a second underlayer; and a magnetic layer including an alloy having a L1.sub.0 type crystal structure with a (001) orientation. The substrate, the first underlayer the second underlayer, and the magnetic layer are stacked in this order. The first underlayer is a crystalline layer that includes W as a main component. The second underlayer is a crystalline layer that includes a material containing W as a main component and that includes an oxide. The content of the oxide in the second underlayer is in a range of from 2 mol % to 30 mol %. The oxide is an oxide of one or more kinds of elements selected from a group consisting of Cr, Mo, Nb, Ta, V, and W.

Provided is a magnetic recording medium having a recording track width of 2 m or less, including: a recording layer containing a powder of particles containing iron oxide, in which a squareness ratio measured in a transport direction is 30% or less, a squareness ratio S1 measured in the transport direction and a squareness ratio S2 measured in a width direction satisfy a relationship S1S2, a coercive force is 220 kA/m or greater and 310 kA/m or less, an activation volume is 8000 nm.sup.3 or less, and in a switching field distribution (SFD) curve, a peak ratio X/Y of a main peak height X and a height Y of a sub-peak near zero magnetic field is 3.0 or greater.

Provided is a magnetic tape, in which servo patterns, each including a first magnetization region formed to be tilted with respect to a width direction of a servo band by an angle along the width direction of the servo band and a second magnetization region not parallel to the first magnetization region along the width direction of the servo band, are repeatedly formed in a longitudinal direction of the servo band, the magnetic tape is used in a recording and reproducing system which uses a reproducing element for reproducing the servo pattern, a width of which satisfies W1(1/tan )stripe width T of the servo pattern, and the angle is greater than 25 and equal to or smaller than 45.

The purpose of the present invention is to provide a magnetic recording medium including a first magnetic recording layer having a large coercive force and a granular structure in which magnetic crystal grains are well separated from each other. The magnetic recording medium of the present invention includes a non-magnetic substrate, a first seed layer, and a first magnetic recording layer formed on the first seed layer, wherein the first seed layer includes Pt, the first magnetic recording layer includes one or more magnetic layers, the magnetic layer in contact with the first seed layer includes Fe, Pt and Ti, and the magnetic layer in contact with the first seed layer has a granular structure consisting of magnetic crystal grains of a L1.sub.0 type ordered alloy including Fe and Pt, and a non-magnetic grain boundary including Ti.

The present invention relates to a magnetic recording medium, and this magnetic recording medium includes at least a non-magnetic substrate and a magnetic recording layer. In the magnetic recording medium of the present invention, the magnetic recording layer includes an ordered alloy having an L1.sub.0-ordered structure, includes Fe, Pt, and V, and has a composition of Pt>Fe. The magnetic recording layer preferably has a granular structure composed of magnetic crystal grains including the ordered alloy and a non-magnetic crystal grain boundary, and the non-magnetic crystal grain boundary includes V.

The magnetic tape includes a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, in which, in a small-angle X-ray scattering spectrum obtained by small-angle X-ray scattering measurement of the non-magnetic support, in a region where a q-value is 0.01 to 0.10 ?.sup.?1, a ratio I.sub.max/I.sub.min of a scattering intensity I.sub.max at a q-value q.sub.max of a maximal value of a scattering intensity change rate to a scattering intensity I.sub.min at a q-value q.sub.min of a minimal value of the scattering intensity change rate is 2.7 or more, and q.sub.min<q.sub.max is satisfied, and a glass transition temperature Tg of the non-magnetic support is 140? C. or higher.

Provided is a magnetic tape, in which, in an environment of a temperature of 32? C. and a relative humidity of 80%, a frictional force F.sub.45? on a magnetic layer surface with respect to an LTO8 head measured at a head tilt angle of 45? is 4 gf or more and 15 gf or less, and standard deviation of a frictional force F on the magnetic layer surface with respect to the LTO8 head measured at each of head tilt angles of 0?, 15?, 30?, and 45? is 10 gf or less. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape.

Disclosed is a perpendicularly magnetized film structure using a highly heat resistant underlayer film on which a cubic or tetragonal perpendicularly magnetized film can grow, comprising a substrate of a cubic single crystal substrate having a (001) plane or a substrate having a cubic oriented film that grows to have the (001) plane; an underlayer formed on the substrate from a thin film of a metal having an hcp structure in which the [0001] direction of the thin metal film forms an angle in the range of 42? to 54? with respect to the <001> direction or the (001) orientation of the substrate; and a perpendicularly magnetized layer located on the metal underlayer and formed from a cubic material selected from a Co-based Heusler alloy and a cobalt-iron (CoFe) alloy having a bcc structure a constituent material, and grown to have the (001) plane.