Magnetic recording media for longitudinal recording

A magnetic recording medium for longitudinal recording, which comprises a nonmagnetic substrate and a magnetic layer provided on the nonmagnetic substrate, the magnetic layer being crystalline and composed mainly of an alloy comprising Co, and simultaneously a material X composed of at least one element selected from a first group consisting of Cr, Mo and W, a material Y' composed of at least one element selected from a second group consisting of Ti, Zr, Hf, Ta, Nb, Ru and Rh, and a material Z composed of at least one element selected from a third group consisting of Al and Si, the composition of the magnetic layer being represented by the following general formula:

• (Co.sub.1-a X.sub.a).sub.1-b-c Y'.sub.b Z.sub.c
• wherein 0.03.ltoreq.a.ltoreq.0.20, 0.01.ltoreq.b.ltoreq.0.15 and 0.01.ltoreq.c.ltoreq.0.15, and wherein the magnetic layer contains 0.1 at % to 15 at % of oxygen.

A magnetic recording medium for longitudinal recording which comprises a nonmagnetic substrate and a magnetic layer provided on the nonmagnetic substrate, the magnetic layer being crystalline and composed mainly of an alloy comprising Co, Pt, and simultaneously Ni, a material Y' composed of at least one element selected from the group consisting of Ti, Zr, Hf, Ta, Nb, Ru and Rh, and a material Z composed of at least one element selected from a third group consisting of Al and Si, wherein the composition of the magnetic layer is represented by the following general formula:

• (Co.sub.1-a Ni.sub.a).sub.1-b-c-d Y'.sub.b Z.sub.c Pt.sub.d,
• wherein 0.1.ltoreq.a.ltoreq.0.5, 0.01.ltoreq.b.ltoreq.0.15 and 0.01.ltoreq.c.ltoreq.0.15 and 0.001.ltoreq.d.ltoreq.0.20.

A magnetic recording medium for longitudinal recording which comprises a nonmagnetic substrate and a magnetic layer provided on the nonmagnetic substrate, the magnetic layer being crystalline and composed mainly of an alloy comprising Co, Pt, and simultaneously a material X' composed of at least one element selected from the group consisting of Ni, Cr, Mo and W, a material Y' composed of at least one element selected from the group consisting of Ti, Zr, Hf, Ta, Nb, Ru and Rh, and a material Z composed of at least one element selected from a third group consisting of Al and Si, wherein the magnetic layer contains 0.1 at % to 15 at % of oxygen.

A magnetic memory apparatus which comprises at least a magnetic recording medium, a driving means for turning the magnetic recording medium, at least a magnetic head for reading and writing to and from the magnetic recording medium, a magnetic head access system in operative connection with the magnetic head for positioning said magnetic head with respect to said magnetic recording medium, and a read and write system operatively connected with the magnetic head, wherein the magnetic recording medium is a magnetic recording medium for longitudinal recording, which comprises a nonmagnetic substrate and a crystalline magnetic layer provided on the nonmagnetic substrate, the crystalline magnetic layer containing 0.1 at % to 15 at % of oxygen and being composed mainly of an alloy comprising Co, and simultaneously a material X composed of at least one element selected from a first group consisting of Cr, Mo and W, a material Y' composed of at least one element selected from a second group consisting of Ti, Zr, Hf, Ta, Nb, Ru and Rh, and a material Z composed of at least one element selected from a third group consisting of Al and Si.

A magnetic memory apparatus, which comprises at least a magnetic recording medium, a driving means for turning the magnetic recording medium, at least a magnetic head for reading and writing to and from the magnetic recording medium, a magnetic head access system in operative connection with the magnetic head for positioning said magnetic head with respect to said magnetic recording medium, and a read and write system operatively connected with the magnetic head, wherein the magnetic recording medium is a magnetic recording medium for longitudinal recording, which comprises a nonmagnetic substrate and a crystalline magnetic layer provided on the nonmagnetic substrate, the crystalline magnetic layer being composed mainly of an alloy comprising Co, and simultaneously a material X composed of at least one element selected from a first group consisting of Cr, Mo and W, a material Y' composed of at least one element selected from a second group consisting of Ti, Zr, Hf, Ta, Nb, Ru and Rh, and a material Z composed of at least one element selected from a third group consisting of Al and Si according to the following general formula:

• (Co.sub.1-a X.sub.a).sub.1-b-c Y'.sub.b Z.sub.c
• wherein 0.03.ltoreq.a.ltoreq.0.20, 0.01.ltoreq.b.ltoreq.0.15, and 0.01.ltoreq.c.ltoreq.0.15, the magnetic layer containing 0.1 at % to 15 at % of oxygen.

A magnetic memory apparatus which comprises at least a magnetic recording medium, a driving means for turning the magnetic recording medium, at least a magnetic head for reading and writing to and from the magnetic recording medium, a magnetic head access system in operative connection with the magnetic head for positioning said magnetic head with respect to said magnetic recording medium, and a read and write system operatively connected with the magnetic head, wherein the magnetic recording medium is a magnetic recording medium for longitudinal recording which comprises a nonmagnetic substrate and a crystalline magnetic layer provided on the nonmagnetic substrate, the composition of the magnetic layer represented by the following general formula:

• (Co.sub.1-a Ni.sub.a).sub.1-b-c-d Y'.sub.b Z.sub.c Pt.sub.d,
• wherein 0.1.ltoreq.a.ltoreq.0.5, 0.01.ltoreq.b.ltoreq.0.15, 0.01.ltoreq.c.ltoreq.0.15 and 0.001.ltoreq.d.ltoreq.0.20, and wherein Y' is composed of at least one element selected from the group consisting of Ti, Zr, Hf, Ta, Nb, Ru and Rh, and a material Z is composed of at least one element selected from the group consisting of Al and Si.

A magnetic memory apparatus which comprises at least a magnetic recording medium, a driving means for turning the magnetic recording medium, at least a magnetic head for reading and writing to and from the magnetic recording medium, a magnetic head access system in operative connection with the magnetic head for positioning said magnetic head with respect to said magnetic recording medium, and a read and write system operatively connected with the magnetic head, wherein the magnetic recording medium is a magnetic recording medium for longitudinal recording which comprises a nonmagnetic substrate and a crystalline magnetic layer provided on the nonmagnetic substrate, the magnetic layer being composed mainly of an alloy comprising Co, Pt, a material X' composed of at least one element selected from a first group consisting of Ni, Cr, Mo and W, a material Y' composed of at least one element selected from a second group consisting of Ti, Zr, Hf, Ta, Nb, Ru and Rh, and a material Z composed of at least one element selected from a third group consisting of Al and Si, wherein the magnetic layer contains 0.1 at % to 15 at % of oxygen.

A magnetic memory apparatus which comprises at least a magnetic recording medium, a driving means for turning the magnetic recording medium, at least a magnetic head for reading and writing to and from the magnetic recording medium and having a magnetic pole, at least a part of which is made of a ferromagnetic metal, a magnetic head access system for positioning said magnetic head with respect to said magnetic recording medium, and a read and write system operatively connected with the magnetic head, wherein the magnetic recording medium is a magnetic recording medium for longitudinal recording, which comprises a nonmagnetic substrate and a crystalline magnetic layer provided on the nonmagnetic substrate, the magnetic layer being composed mainly of an alloy comprising Co, and simultaneously a material X' composed of at least one element selected from a first group consisting of Cr, Mo and W, a material Y' composed of at least one element selected from a second group consisting of Ti, Zr, Hf, Ta, Nb, Ru and Rh, and a material Z composed of at least one element selected from a third group consisting of Al and Si, wherein the magnetic layer contains 0.1 at % to 15 at % of oxygen.

A magnetic memory apparatus which comprises at least a magnetic recording medium, a driving means for turning the magnetic recording medium, at least a magnetic head having a magnetic pole at least a part of which is made of a ferromagnetic metal for reading and writing to and from the magnetic recording medium, a magnetic head access system for positioning said magnetic head with respect to said magnetic recording medium and operatively connected with the magnetic head, and a read and write signal processing system operatively connected with the magnetic head, wherein the magnetic recording medium is a magnetic medium for longitudinal recording and comprises a nonmagnetic substrate and a crystalline magnetic layer provided on the nonmagnetic substrate, the magnetic layer being composed mainly of an alloy comprising Co, Pt, and simultaneously a material X' composed of at least one element selected from a first group consisting of Ni, Cr, Mo and W, a material Y' composed of at least one element selected from a second group consisting of Ti, Zr, Hf, Ta, Nb, Ru and Rh, and a material Z composed of at least one element selected from a third group consisting of Al and Si, wherein the magnetic layer contains 0.1 at % to 15 at % of oxygen.

A magnetic memory apparatus which comprises at least a magnetic recording medium, a driving means for turning the magnetic recording medium, at least a magnetic head for reading and writing to and from the magnetic recording medium and at least a portion of magnetic pole is made of a ferromagnetic metal, a magnetic head access system in operative connection with the magnetic head for positioning said magnetic head with respect to said magnetic recording medium, and a read and write system operatively connected with the magnetic head, wherein the magnetic recording medium is a magnetic recording medium for longitudinal recording which comprises a nonmagnetic substrate, a nonmagnetic metallic underlayer comprising at least one metal element selected from the group consisting of Cr, Mo, W, V, Nb and Ta, formed on the nonmagnetic substrate, and a magnetic layer of Co-based alloy, formed on the nonmagnetic metallic underlayer, the magnetic layer comprising at least one first additive element selected from a group consisting of Pt and Ir, at least one second additive element selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Ge and Si, and oxygen.

A magnetic memory apparatus, comprising at least a magnetic recording medium, a driving means for turning the magnetic recording medium, a magnetic head for reading and writing to and from the magnetic recording medium and at least a portion of magnetic pole is made of a ferromagnetic metal, a magnetic head access system in operative connection with the magnetic head for positioning said magnetic head with respect to said magnetic recording medium, and a read and write system operatively connected with the magnetic head, wherein the magnetic recording medium is a magnetic recording medium for longitudinal recording which comprises a nonmagnetic substrate, a nonmagnetic metallic underlayer comprising at least one metal element selected from the group consisting of Cr, Mo, W, V, Nb and Ta, formed on the nonmagnetic substrate, and a magnetic layer of Co-based alloy, formed on the nonmagnetic metallic underlayer, the magnetic layer comprising at least one first additive element, at least one second additive element, and oxygen, wherein the first additive element is Pt, and the second additive element is Cr and Si.