Abstract: A perpendicular magnetic recording medium is disclosed that is able to prevent the Wide Area Track Erasure phenomenon from occurring and is capable of high density recording. The perpendicular magnetic recording medium includes a substrate; a soft-magnetic backup stack structure including a first magnetic layer, a first non-magnetic coupling layer, and a second magnetic layer stacked on the substrate in order; an intermediate layer formed from a non-magnetic material on the soft-magnetic backup stacked structure; and a recording layer on the intermediate layer, the recording layer having an easy axis of magnetization perpendicular to the surface of the substrate.

Abstract: A perpendicular magnetic recording medium is disclosed that is able to prevent the Wide Area Track Erasure phenomenon from occurring and is capable of high density recording. The perpendicular magnetic recording medium includes a substrate; a soft-magnetic backup layer on the substrate; a separation layer on the soft-magnetic backup layer and formed from a non-magnetic material; a magnetic flux control layer on the separation layer; and a recording layer on the magnetic flux control layer having an easy axis of magnetization perpendicular to the surface of the substrate. The magnetic flux control layer is formed from a poly-crystal ferromagnetic material having an easy axis of magnetization perpendicular to the surface of the substrate.

Abstract: A magnetic recording medium includes a substrate, a magnetic recording layer made of a Co alloy or a CoCr alloy, a seed layer disposed between the substrate and the magnetic recording layer, and an underlayer made of a binary alloy material having a B2 structure and disposed between the seed layer and the magnetic recording layer. The seed layer is made of a material comprising essentially of one of elements forming the binary alloy material of the underlayer.

Abstract: A magnetic recording medium includes a plurality of recording cells separated from each other on a substrate in a recording direction and a track width direction perpendicular to the recording direction. The recording cell includes a recording layer. The recording layer has a magnetic easy axis inclining in a designated oblique direction against a surface of the substrate.

Abstract: A magnetic recording medium including a textured surface that is textured in a predetermined direction. The textured surface preferably has a distance ? between two mutually adjacent texturing lines satisfying a relationship 5<?<30 nm, and an angle ? between the textured surface and an oblique texture plane satisfying a relationship 0.5<?<7 degrees. There is also a Cr-based underlayer provided on the textured surface that has a preferred growth so that a number of grains having Cr<110> in a vicinity of 0 degrees or 90 degrees with respect to the predetermined direction is two times or greater than a number of grains having Cr<110> in a vicinity of 45 degrees with respect to the predetermined direction. Additionally, there is also a Co-based magnetic layer provided on the underlayer that has Co(1120) preferred growth along the predetermined direction.

Abstract: A magnetic recording medium is provided with an orientation control layer and an underlayer disposed above the substrate, an underlayer disposed above the orientation control layer, and a recording layer having an hcp crystal structure and disposed on a surface of the underlayer. A part of the recording layer is epitaxially grown on the surface of the underlayer and has c-axes that are inclined with respect to a surface of the substrate.

Abstract: A magnetic recording medium is provided with an orientation control layer and an underlayer disposed above the substrate, an underlayer disposed above the orientation control layer, and a recording layer having an hcp crystal structure and disposed on a surface of the underlayer. The recording layer is epitaxially grown on the surface of the underlayer and has c-axes that are inclined with respect to a surface of the substrate.

Abstract: A magnetic recording medium has a base structure, and a synthetic ferrimagnetic structure which is disposed on the base structure and forms a recording layer. The synthetic ferrimagnetic structure includes at least a bottom magnetic layer and a top magnetic layer which are antiferromagnetically coupled via a nonmagnetic spacer layer. The bottom magnetic layer is made of a superparamagnetic layer, and the top magnetic layer is made of a ferromagnetic material. Magnetic moment orientations of the bottom and top magnetic layers are antiparallel at remanent state where an external applied magnetic field is zero. This is achieved since the bottom magnetic layer is in a reverse saturated state due to exchange coupling at remanence, though coercivity is zero for bottom magnetic layer.

Abstract: A magnetic recording medium is provided with an hcp Co alloy magnetic layer with the crystallographic c-axes tilted at an angle from a substrate surface and fixed relative to a recording direction. The tilt is induced by epitaxial growth of the hcp Co alloy on an obliquely evaporated nonmagnetic polycrystalline underlayer, so that the magnetic recording medium exhibits thermal stability and improved overwrite with a single pole-type head.

Abstract: A magnetic recording medium includes a seed layer made of one of AlRu and AlV, a magnetic recording layer made of a CoCr alloy, and an underlayer made of the other of AlRu and AlV, where the underlayer is disposed between the seed layer and the magnetic recording layer.

Abstract: A magnetic recording medium includes a textured surface which is textured in a predetermined direction, a Cr-based underlayer provided on the textured surface and having Cr<110> preferred growth along the predetermined direction so that over approximately 50% of Cr<110> are oriented along the predetermined direction, and a Co-based magnetic layer provided on the underlayer and having Co(1120) preferred growth along the predetermined direction.

Abstract: A magnetic recording medium includes a first magnetic layer; and a second magnetic layer formed on the first magnetic layer. The first magnetic layer and the second magnetic layer make exchange coupling therebetween and also, have their magnetizing direction in anti-parallel to one another. A net residual area magnetization of the first magnetic layer and the second magnetic layer is expressed by the following formula: |Mr1×t1?Mr2×t2| where Mr1 and Mr2 denote respective residual magnetizations of the first magnetic layer and the second magnetic layer, and t1 and t2 denote respective film thicknesses of them; and the net area magnetization at a first temperature is larger than the net area magnetization at a second temperature lower than the first temperature.

Abstract: A magnetic recording medium is provided with a substrate, a recording magnetic layer made of a CoCr alloy and having a (1120) crystallographic texture, and an underlayer, made of an AlV or AlRuV alloy, disposed between the substrate and the magnetic layer.

Abstract: A magnetic recording medium includes a textured surface which is textured in a predetermined direction, a Cr-based underlayer provided on the textured surface and having Cr<110> preferred growth along the predetermined direction so that over approximately 50% of Cr<110> are oriented along the predetermined direction, and a Co-based magnetic layer provided on the underlayer and having Co(1120) preferred growth along the predetermined direction.

Abstract: A magnetic recording medium includes a substrate, a magnetic recording layer made of a Co alloy or a CoCr alloy, a seed layer disposed between the substrate and the magnetic recording layer, and an underlayer made of a binary alloy material having a B2 structure and disposed between the seed layer and the magnetic recording layer. The seed layer is made of a material comprising essentially of one of elements forming the binary alloy material of the underlayer.

Abstract: A magnetic recording medium has a base structure, and a synthetic ferrimagnetic structure which is disposed on the base structure and forms a recording layer. The synthetic ferrimagnetic structure includes at least a bottom magnetic layer and a top magnetic layer which are antiferromagnetically coupled via a nonmagnetic spacer layer. The bottom magnetic layer is made of a superparamagnetic layer, and the top magnetic layer is made of a ferromagnetic material. Magnetic moment orientations of the bottom and top magnetic layers are antiparallel at remanent state where an external applied magnetic field is zero. This is achieved since the bottom magnetic layer is in a reverse saturated state due to exchange coupling at remanence, though coercivity is zero for bottom magnetic layer.

Abstract: A magnetic recording medium includes a textured surface which is textured in a predetermined direction, a Cr-based underlayer provided on the textured surface and having Cr<110> preferred growth along the predetermined direction so that over approximately 50% of Cr<110> are oriented along the predetermined direction, and a Co-based magnetic layer provided on the underlayer and having Co(1120) preferred growth along the predetermined direction.