Abstract: A perpendicular magnetic recording medium having a soft magnetic backing layer is disclosed. The medium has reduced Co elution, improved corrosion resistance, and satisfactory electromagnetic transducing characteristics, without providing constraints on the configuration of the protective layer such as, for example, the thickness of the protective layer, film deposition processes or layer configuration.

Abstract: A perpendicular magnetic recording medium is disclosed which is capable of reducing the orientational dispersion and crystal grain size of a magnetic recording layer, simultaneously reducing the thickness of a non-magnetic intermediate layer, hence, reducing noise, and improving S/N ratio and recording density characteristics. The medium includes a non-magnetic substrate, soft magnetic underlayer, seed layer, first non-magnetic intermediate layer, second non-magnetic intermediate layer, granular magnetic recording layer, exchange coupling force control layer, non-granular magnetic recording layer, protective layer, and lubricant layer sequentially formed on the non-magnetic substrate. The first and second non-magnetic intermediate layers are laminated to form a two-layer non-magnetic intermediate layer and the seed layer is made of a material having an fcc structure.

Abstract: A perpendicular magnetic recording medium is disclosed which is capable of reducing the orientational dispersion and crystal grain size of a magnetic recording layer, simultaneously reducing the thickness of a non-magnetic intermediate layer, hence, reducing noise, and improving S/N ratio and recording density characteristics. The medium includes a non-magnetic substrate, soft magnetic underlayer, seed layer, first non-magnetic intermediate layer, second non-magnetic intermediate layer, granular magnetic recording layer, exchange coupling force control layer, non-granular magnetic recording layer, protective layer, and lubricant layer sequentially formed on the non-magnetic substrate. The first and second non-magnetic intermediate layers are laminated to form a two-layer non-magnetic intermediate layer and the seed layer is made of a material having an fcc structure.

Abstract: A perpendicular magnetic recording media is disclosed which employs inexpensive materials in the intermediate layer of the high-recording density media while exhibiting magnetic characteristics comparable or superior to those of media using Ru or Re. A perpendicular magnetic recording apparatus employing this perpendicular magnetic recording media also is disclosed. The perpendicular magnetic recording media has a nonmagnetic substrate, a soft magnetic backing layer formed on the nonmagnetic substrate, a seed layer formed on the soft magnetic backing layer, an intermediate layer formed on the seed layer, a magnetic layer formed on the intermediate layer, and a protective layer formed on the magnetic layer. The intermediate layer comprises an alloy with the hcp structure containing 55 at % or more Zn, the magnetic layer comprises an alloy with the hcp structure containing Co, and the ??50 value of the orientation plane (0002) of the magnetic layer is between 1.5° and 4°.

Abstract: A magnetic recording medium exhibiting a high recording density performance is disclosed. The perpendicular magnetic recording medium has a soft magnetic underlayer, a first seed layer, a second seed layer, an intermediate layer, a granular magnetic recording layer, a non-granular magnetic recording layer, a protective layer, and a lubricant layer laminated on a nonmagnetic substrate in this order. The first seed layer contains cobalt, nickel, and at least one element selected from a group consisting of Si, Cr, V, Zr, Nb, Ta, Ti, Cu, and Mo, and the second seed layer contains nickel, chromium, and at least one element selected from a group consisting of Si, V, Zr, Nb, Ta, Ti, Cu, and Mo.

Abstract: A magnetic recording medium exhibiting a high recording density performance is disclosed. The perpendicular magnetic recording medium has a soft magnetic underlayer, a first seed layer, a second seed layer, an intermediate layer, a granular magnetic recording layer, a non-granular magnetic recording layer, a protective layer, and a lubricant layer laminated on a nonmagnetic substrate in this order. The first seed layer contains cobalt, nickel, and at least one element selected from a group consisting of Si, Cr, V, Zr, Nb, Ta, Ti, Cu, and Mo, and the second seed layer contains nickel, chromium, and at least one element selected from a group consisting of Si, V, Zr, Nb, Ta, Ti, Cu, and Mo.

Abstract: A perpendicular magnetic recording medium having a soft magnetic backing layer is disclosed. The medium has reduced Co elution, improved corrosion resistance, and satisfactory electromagnetic transducing characteristics, without providing constraints on the configuration of the protective layer such as, for example, the thickness of the protective layer, film deposition processes or layer configuration.

Abstract: A perpendicular magnetic recording medium having a soft magnetic backing layer in which amount of cobalt elution is suppressed without imposing restraint on the construction of the protective layer is disclosed. The perpendicular magnetic recording medium of the invention comprises at least a soft magnetic backing layer, a magnetic recording layer, and a protective layer sequentially laminated on a nonmagnetic substrate, the soft magnetic backing layer containing iron and cobalt, and further containing at least two elements selected from Si, Ni, Ta, Nb, Zr, Ti, Cr, Mo, and B, and the surface roughness of the soft magnetic backing layer being in a range of 0.2 nm to 0.8 nm in center line average roughness. The iron concentration in the soft magnetic backing layer preferably is in the range of 40 at % to 85 at %, the cobalt concentration preferably is in a range of 10 at % to 45 at %, and the total concentration of Si, Ni, Ta, Nb, Zr, Ti, Cr, Mo, and B is in a range of 20 at % to 50 at %.

Abstract: A perpendicular magnetic recording media is disclosed which employs inexpensive materials in the intermediate layer of the high-recording density media while exhibiting magnetic characteristics comparable or superior to those of media using Ru or Re. A perpendicular magnetic recording apparatus employing this perpendicular magnetic recording media also is disclosed. The perpendicular magnetic recording media has a nonmagnetic substrate, a soft magnetic backing layer formed on the nonmagnetic substrate, a seed layer formed on the soft magnetic backing layer, an intermediate layer formed on the seed layer, a magnetic layer formed on the intermediate layer, and a protective layer formed on the magnetic layer. The intermediate layer comprises an alloy with the hcp structure containing 55 at % or more Zn, the magnetic layer comprises an alloy with the hcp structure containing Co, and the A?50 value of the orientation plane (0002) of the magnetic layer is between 1.5° and 4°.

Abstract: A perpendicular magnetic recording medium having a soft magnetic backing layer in which amount of cobalt elution is suppressed without imposing restraint on the construction of the protective layer is disclosed. The perpendicular magnetic recording medium of the invention comprises at least a soft magnetic backing layer, a magnetic recording layer, and a protective layer sequentially laminated on a nonmagnetic substrate, the soft magnetic backing layer containing iron and cobalt, and further containing at least two elements selected from Si, Ni, Ta, Nb, Zr, Ti, Cr, Mo, and B, and the surface roughness of the soft magnetic backing layer being in a range of 0.2 nm to 0.8 nm in center line average roughness. The iron concentration in the soft magnetic backing layer preferably is in the range of 40 at % to 85 at %, the cobalt concentration preferably is in a range of 10 at % to 45 at %, and the total concentration of Si, Ni, Ta, Nb, Zr, Ti, Cr, Mo, and B is in a range of 20 at % to 50 at %.

Abstract: A perpendicular magnetic recording medium is disclosed that exhibits improved write performance without impairing thermal stability or electromagnetic conversion performance such as noise characteristics. A perpendicular magnetic recording medium of the invention comprises a nonmagnetic underlayer and a granular type magnetic layer. In measurements on ferromagnetic crystal grains by grazing incidence X-ray diffraction, a ratio A/B is in the range of 0.2 to 1.5, in which A represents an integrated intensity of fcc (111) peak obtained with a X-axis angle of 69.5° and B represents an integrated intensity of hcp (101) peak obtained with a X-axis angle of 60.2°. The medium can include a soft magnetic backing layer and a seed layer. The seed layer preferably is a lamination of a layer with an amorphous structure and a layer with a crystal structure of fcc or hcp.

Abstract: A magnetic recording medium and a manufacturing method thereof can be formed or carried out without substrate heating. The magnetic recording medium has a seed layer of a nonmagnetic material having a bcc structure that has (211) orientation formed on a nonmagnetic substrate, an underlayer of a nonmagnetic material having a bcc structure that is different to that of the seed layer 102 and having (211) preferential orientation formed on the seed layer, an intermediate layer of a nonmagnetic material having an hcp structure that has (100) preferential orientation formed on the underlayer, and a magnetic layer of an hcp CoCr alloy that has (100) preferential orientation formed on the intermediate layer.