To provide a magnetic recording tape and the like that have excellent magnetic properties and exhibit a favorable SNR. There are provided a magnetic recording tape and the like including at least: a base layer that includes a long film having flexibility; and a magnetic layer formed on a side of one main surface of the base layer, in which an under layer and a seed layer are provided in the stated order from a side of the magnetic layer toward a side of the base layer between the magnetic layer and the base layer, the underlayer contains at least Co and Cr, and has an average atomic number ratio represented by the following formula (1): Co.sub.(100-y)Cr.sub.y (where y is within a range of 37≤y≤45.), and the seed layer formed directly on the base layer has a film thickness of 5 nm or more and 30 nm or less, and contains Ti and O and has an average atomic number ratio represented by the following formula (2): Ti.sub.(100-x)O.sub.x (where x≤10.) or contains Ti—Cr—O and has an average atomic number ratio represented by the following formula (3): (TiCr).sub.(100-x)O.sub.x (where x≤10.).

A magnetic recording cartridge is provided and including a magnetic recording medium, wherein an average thickness of the magnetic recording medium t.sub.T is 3.5 μm≤t.sub.T≤5.6 μm, a dimensional change amount Δw in a width direction of the magnetic recording medium with respect to a tension change in a longitudinal direction of the magnetic recording medium is 700 ppm/N≤Δw≤20000 ppm, the magnetic recording medium is accommodated in a state of being wound around the reel in the cartridge case and (a servo track width on an inner side of winding of the magnetic recording medium)—(a servo track width on an outer side of winding of the magnetic recording medium)>0 is satisfied, and a squareness ratio measured in a vertical direction of the magnetic recording medium is 65% or more.

The present invention is to provide an assisted magnetic recording medium including a substrate; an underlayer disposed on the substrate; a magnetic layer disposed on the underlayer and including an alloy having an L1.sub.0-type crystal structure; and a pinning layer disposed in contact with the magnetic layer, wherein the pinning layer includes a granular structure, the granular structure containing magnetic particles and grain boundaries, wherein the magnetic particles contain Co, and wherein the grain boundaries contain Y.sub.2O.sub.3 and/or an oxide of lanthanoid.

A heat-assisted magnetic recording device includes a granular magnetic recording layer and a thermal absorption layer formed on top of the magnetic recording layer. The thermal absorption layer is patterned to include rows extending in a cross-track direction of the magnetic media, each adjacent pair of the rows being separated from one another by an insulating material.

Methods of forming a layer of magnetic material on a substrate, the method including: configuring a substrate in a chamber; controlling the temperature of the substrate at a substrate temperature, the substrate temperature being at or below about 250 C.; and introducing one or more precursors into the chamber, the one or more precursors including: cobalt (Co), nickel (Ni), iron (Fe), or combinations thereof, wherein the precursors chemically decompose at the substrate temperature, and wherein a layer of magnetic material is formed on the substrate, the magnetic material including at least a portion of the one or more precursors, and the magnetic material having a magnetic flux density of at least about 1 Tesla (T).

The purpose of the present invention is to provide a magnetic recording medium having a stacked structure of a seed layer including (Mg.sub.1-xTi.sub.x)O and a magnetic recording layer including an L1.sub.0 ordered alloy, and having improved properties. The method for producing a magnetic recording layer according to the present invention includes the steps of: (1) preparing a substrate; (2) forming a seed layer including (Mg.sub.1-xTi.sub.x)O onto the substrate; (3) plasma etching the seed layer in an atmosphere including inert gas; and (4) forming a magnetic recording layer including an ordered alloy onto the seed layer which has been subjected to the step (3).

There is provided a magnetic recording medium of which an average thickness t.sub.T is t.sub.T5.6 m, a dimensional change amount w in a width direction with respect to a change in tension in a longitudinal direction is 660 ppm/Nw, a squareness ratio in a vertical direction is 65% or more, and a width deformation coefficient b during long-term storage in a case where a long-term storage width change amount Y is defined as Y=blog(t) is 0.06 mb0.06 m.

There is provided a magnetic recording medium which has a layer structure including a magnetic layer and a base layer, and of which an average thickness t.sub.T is t.sub.T5.6 m, a dimensional change amount w in a width direction with respect to a change in tension in a longitudinal direction is 660 ppm/Nw, a servo pattern is recorded on the magnetic layer, a standard deviation PES of a position error signal (PES) value obtained from a servo signal in which the servo pattern is reproduced is PES25 nm, and a maximum value .sub.1M of a friction coefficient .sub.1 between a surface on a side of the magnetic layer and an LTO3 head in a case where measurement of the friction coefficient .sub.1 is performed 250 times is 0.04.sub.1M0.5.

A magnetic recording medium is provided and includes a magnetic layer, a non-magnetic layer, a base layer and a back layer, wherein an average thickness t.sub.T of the magnetic recording medium is t.sub.T5.3 m, a dimensional change amount w in a width direction with respect to a change in tension in a longitudinal direction is 700 ppm/Nw, a thickness of the non-magnetic layer is 2.0 m or less, a squareness ratio measured in a vertical direction of the magnetic recording medium is 65% or more, and the magnetic layer includes a magnetic powder.

A magnetic recording medium is provided and includes a layer structure including a magnetic layer, a non-magnetic layer, and a base layer in this order, in which an average thickness t.sub.T of the magnetic recording medium is 3.5 mt.sub.T5.3 m, a dimensional variation w in a width direction of the magnetic recording medium to tension change in a longitudinal direction of the magnetic recording medium is 700 ppm/Nw2000 ppm/N, and an average thickness t.sub.n of the non-magnetic layer is t.sub.n1.0 m.