Abstract: A medium having at least a nonmagnetic substrate, soft magnetic backing layer, soft magnetic underlayer, and perpendicular magnetic recording layer, and An oxidized layer of the soft magnetic backing layer is also formed on the soft magnetic backing layer, and the soft magnetic underlayer has a three-layered structure including a first soft magnetic layer, interlayer, and second soft magnetic layer, a crystalline orientation control layer, e.g., an Ni orientation control layer is formed between the soft magnetic underlayer and the perpendicular magnetic recording layer.

Abstract: The magnetic recording medium comprises a soft magnetic undercoat film, an orientation control film that controls the orientation of a film provided directly above, a perpendicular magnetic film of which axis of easy magnetization is generally oriented perpendicular to a non-magnetic substrate, and a protective film, that are provided on the non-magnetic substrate, wherein the orientation control film is made of a Co alloy which contains one or more elements selected from Ti, V, Sr, Y, Nb, Mo, Hf, Ta, Ni and W.

Abstract: A magnetic recording medium includes a nonmagnetic substrate on which is provided at least a softly magnetic under-film, an orientation control film that controls an orientation of a film directly above, a perpendicular magnetic recording film having an axis of easy magnetization oriented to be mainly perpendicular to the substrate and a protective film, wherein the orientation control film is alloy containing at least Cr and C. The magnetic recording medium is manufactured by a method including carrying out, in order, at least a step of forming a softly magnetic under-film on a nonmagnetic substrate, a step of forming an orientation control film that controls an orientation of a film directly above, a step of forming a perpendicular magnetic recording film having an axis of easy magnetization oriented to be mainly perpendicular to the substrate, and a step of forming a protective film.

Abstract: A magnetic recording medium which exhibits excellent magnetic characteristics and which can be easily produced is disclosed. A magnetic recording medium containing a non-metallic substrate 1, a non-magnetic undercoat film 3, a cobalt alloy hexagonal closed packed (hcp) (110) textured magnetic film 4, and a protective film 5 formed on the substrate. An orientation-determining film 2, which determines the crystal orientation of an undercoat film provided directly thereon to cause the texture of the undercoat film to be (200), is formed between the substrate 1 and the undercoat film 3. The orientation-determining film 2 has a crystal structure such that columnar fine crystal grains 2a are inclined in a radial direction of the substrate 1, and the ratio of a coercive force in a circumferential direction of the medium (Hcc) to a coercive force in a radial direction of the medium (Hcr); i.e., Hcc/Hcr, is more than 1.

Abstract: The present invention provides a magnetic recording medium having excellent magnetic read/write characteristics and thermal stability, a method of manufacturing therefor, and a magnetic read/write apparatus. The magnetic recording medium comprises a soft magnetic undercoat film, an orientation control film, a perpendicular magnetization film, and a protective film, that are formed on a non-magnetic substrate, wherein the orientation control film has an hcp structure and, at the same time, &Dgr;&thgr;50 of the (0002) orientation plane is set within a range from 3 to 10 degrees and a difference (&Dgr;&thgr;50 (mag)−&Dgr;&thgr;50 (ori)) between &Dgr;&thgr;50 (ori) of the orientation control film and &Dgr;&thgr;50 (mag) of the perpendicular magnetization film is set within a range from 1 to 8 degrees.

Abstract: A magnetic recording medium comprising at least a soft magnetic layer, an orientation control film that controls the orientation of a film provided directly thereabove, an intermediate film, a perpendicular magnetic recording film of which the axis of easy magnetization is generally oriented perpendicular to a non-magnetic substrate, and a protective film, that are provided on said substrate, wherein the intermediate film has saturation magnetization Ms of at least 20 (emu/cc) and equal to or less than 200 (emu/cc), a method of manufacture thereof, and a magnetic read/write apparatus.

Abstract: A magnetic recording medium comprising a non-metallic substrate, a non-magnetic undercoat film, a magnetic film, and a protective film are formed, wherein an orientation-determining film, which determines crystalline orientation of a film provided directly on the orientation-determining film when subjected to surface-texturing, is formed between the non-metallic substrate and the non-magnetic undercoat film. The orientation-determining film comprises NiPX and X has a melting point of 600-2000° C.

Abstract: A magnetic recording medium exhibiting excellent recording and reproduction characteristics is disclosed. A magnetic recording medium includes a non-magnetic substrate 1; a soft magnetic undercoat film 2; an orientation-regulating film 3; a perpendicular magnetic film 4; and a protective film 5, the films being formed on the substrate 1. The soft magnetic undercoat film 2 contains a material represented by the following composition: aFe-bCo-cM-dX1-fN where M is one or more elements selected from Ti, Zr, Nb, Hf, Ta, V, and Mo; X1 is one or more elements selected from Cr, Ga, Al, Si, and Ni; and a, b, c, d, and f represent atomic percentages and satisfy the following relations: 60≦a+b≦90, 30≦a≦90, 5≦c≦20, 0.1≦d≦7, and 3≦f≦30.

Abstract: A double layered perpendicular recording media having, between a soft magnetic layer and perpendicular magnetic recording layer, an alignment control layer containing an amorphous portion, a crystal size control layer, and an underlayer having one of a hexagonal closest packed structure and a face-centered cubic structure.

Abstract: An object of the present invention is to provide a process for easily producing a magnetic recording medium exhibiting excellent magnetic characteristics. In the present invention, an orientation-determining film is formed on a non-metallic substrate which has undergone texturing, the orientation-determining film is subjected to oxidation or nitridation, and a non-magnetic undercoat film and a magnetic film are formed on the film.

Abstract: The present invention is made to provide a magnetic recording medium, which exhibits excellent magnetic characteristics, such as thermal stability and excellent glide height characteristics, and can be easily produced. The basic constitution is a non-magnetic substrate on which is formed a non-magnetic undercoat layer, a magnetic layer, and a protective layer, wherein the non-magnetic undercoat layer has a bcc structure; an orientation-adjustment layer for causing the non-magnetic undercoat layer to have a predominant orientation plane of (200) is formed between the non-magnetic substrate and the non-magnetic undercoat layer; the magnetic layer has a crystal structure in which columnar fine crystal grains are inclined in the circumferential direction; and the ratio of the coercive force in the circumferential direction of the magnetic layer 4 Hcc to the coercive force in the radial direction Hcr, i.e., Hcc/Hcr, is more than 1.

Abstract: The present invention provides a magnetic recording medium having excellent magnetic read/write characteristics and thermal stability, a method of manufacturing therefor, and a magnetic read/write apparatus. The magnetic recording medium comprising a soft magnetic undercoat film 2, an orientation control film 3, a perpendicular magnetization film 4, and a protective film 5, that are formed on a non-magnetic substrate 1, wherein the orientation control film 3 has an hcp structure and, at the same time, &Dgr;&thgr;50 of the (0002) orientation plane is set within a range from 3 to 10 degrees and a difference (&Dgr;&thgr;50 (mag)−&Dgr;&thgr;50 (ori)) between &Dgr;&thgr;50 (ori) of the orientation control film 3 and &Dgr;&thgr;50 (mag) of the perpendicular magnetization film 4 is set within a range from 1 to 8 degrees.

Abstract: An object of the present invention is to provide a process for easily producing a magnetic recording medium exhibiting excellent magnetic characteristics. In the present invention, an orientation-determining film is formed on a non-metallic substrate which has undergone texturing, the orientation-determining film is subjected to oxidation or nitridation, and a non-magnetic undercoat film and a magnetic film are formed on the film.

Abstract: A magnetic recording medium that is capable of recording and reading back information at a higher density by improving the read/write characteristics and thermal stability, a method of manufacture therefor, and a magnetic read/write apparatus are provided. This magnetic recording medium, comprises an orientation control film that controls the orientation of a film provided directly thereabove, a perpendicular magnetic film, of which the axis of easy magnetization is generally oriented perpendicular to a non-magnetic substrate, and a protective film, that are provided on the non-magnetic substrate, wherein the perpendicular magnetic film is made of a material which contains Co, Cr, Pt and Cu, the Cr content being 16 at % to 24 at % and the Cu content being 0.

Abstract: In a magnetic recording medium, a longitudinal hard magnetic layer, interlayer, longitudinal soft magnetic layer, and magnetic recording layer are multilayered on a substrate. The interlayer is one of a magnetic layer having saturation magnetization smaller than that of the longitudinal hard magnetic layer, a nonmagnetic layer mainly containing cobalt or ruthenium or having a thickness of 0.5 nm or less, and an oxide layer of the longitudinal hard magnetic layer.

Abstract: Epitaxial growth of a magnetic grain crystal in a perpendicular magnetic recording layer is interrupted.

Abstract: A magnetic recording medium exhibiting excellent recording and reproduction characteristics is disclosed. A magnetic recording medium includes a non-magnetic substrate 1; a soft magnetic undercoat film 2; an orientation-regulating film 3; a perpendicular magnetic film 4; and a protective film 5, the films being formed on the substrate 1.

Abstract: A magnetic recording medium having a non-magnetic substrate; an orientation-regulating layer for regulating the crystal orientation of a layer provided directly thereon; a perpendicular magnetic layer in which easy-magnetization axes are oriented generally perpendicular to the substrate; and a protective layer is disclosed. The perpendicular magnetic layer is formed from a material containing Co as a primary component and at least Cr, Pt, and Nd. A process to produce the magnetic recording medium and a magnetic recording and reproducing apparatus are also disclosed.

Abstract: A magnetic recording medium having excellent magnetic read/write characteristics and thermal stability characteristics, and a method of manufacturing therefor, and a magnetic read/write apparatus are provided. This magnetic recording medium comprises an orientation control film 3 that controls the orientation of a film provided directly thereabove, a perpendicular magnetic film 5, of which the axis of easy magnetization is generally oriented perpendicular to a substrate, and a protective film 6, that are provided on a non-magnetic substrate 1, wherein the orientation control film 3 is made of a non-magnetic material which contains 33 to 80 at % of Ni and one or more kinds of elements selected from Sc, Y, Ti, Zr, Hf, Nb and Ta.

Abstract: The present invention provides a magnetic recording medium that does not cause a deterioration of the noise characteristics and improves the production efficiency, a manufacturing method for the same, and a magnetic recording replay apparatus. An in-plane undercoat film 2 and an in-plane hard magnetic film 3 whose axis of easy magnetization is generally oriented in the in-plane direction are formed between the non-magnetic substrate 1 and the soft magnetic film 4, the in-plane undercoat film 2 comprises Cr or a Cr alloy, and the in-plane hard magnetic film 3 has as the major constituent a CoCrPtX alloy (where X is one or more of B, Ta, Cu, Zr, Nb, Re, Ni, Mn, Ge, Si, O, and N).