Vertical magnetic recording medium, magnetic recording apparatus and manufacturing method of a vertical magnetic recording medium
View Patent ↗A vertical magnetic recording medium includes a substrate, a soft magnetic backing layer formed on the substrate, a magnetic flux confinement layer formed on the soft magnetic backing layer, an intermediate layer formed on the magnetic flux confinement layer, and a recording layer of a vertical magnetization film formed on the intermediate layer. The magnetic flux confinement layer has a plurality of soft magnetic parts each formed along a track region of plural track regions and a non-magnetic parts formed between adjacent track regions. The intermediate layer is formed of a non-magnetic material and is formed so as to cover a surface of the soft magnetic part and the non-magnetic parts.
1. A vertical magnetic recording medium having a recording layer including a track region recorded with information by a magnetic head and an inter-track region separating said track region from an adjacent track region offset in position from said track region in a width direction thereof, said track region and said inter-track region being formed magnetically in said magnetic recording layer, said magnetic recording medium comprising:
a substrate;
a soft magnetic backing layer formed on said substrate;
a magnetic flux confinement layer formed on said soft magnetic backing layer;
an intermediate layer formed on said magnetic flux confinement layer; and
a recording layer of a vertical magnetization film formed on said intermediate layer,
wherein said magnetic flux confinement layer comprises a soft magnetic part formed along said track region and a non-magnetic part formed between said track region and said adjacent track region,
said intermediate layer comprises a non-magnetic material of an amorphous material or microcrystalline material and is formed so as to cover a surface of said soft magnetic parts and said non-magnetic parts, and
said soft magnetic part of said magnetic flux confinement layer comprises a soft magnetic material having a higher magnetic permeability than a soft magnetic material forming said soft magnetic backing layer.
2. The vertical magnetic recording medium as claimed in claim 1 , wherein said vertical magnetic recording medium is a magnetic disk, and
wherein said soft magnetic part and said non-magnetic part are formed respectively in a concentric pattern having a center generally coincident with a center of said magnetic disk, said soft magnetic part and said non-magnetic part are disposed alternately in a radial direction of said magnetic disk.
3. The vertical magnetic recording medium as claimed in claim 1 , wherein said intermediate layer is formed of a material selected from the group consisting of SiO 2 , Al 2 O 3 , TiO 2 , TiC, C, and a hydrogenated carbon.
4. The vertical magnetic recording medium as claimed in claim 1 , wherein said intermediate layer comprises a seed layer of an amorphous material, an underground layer of a soft magnetic material, and a non-magnetic metal intermediate layer formed of a material selected from the group consisting of Co, Cr, Ru, Re, Hf and an alloy thereof.
5. The vertical magnetic recording medium as claimed in claim 1 , wherein said non-magnetic part of said magnetic flux confinement layer comprises a resin material.
6. The vertical magnetic recording medium as claimed in claim 5 , wherein said resin material is formed of any of a thermoplastic resin material and a photosensitive resin material.
7. The vertical magnetic recording medium as claimed in claim 1 , wherein said soft magnetic part has a lateral size, taken in a direction so as to cross plural tracks, such that said lateral size at a bottom surface of said soft magnetic part is smaller than said lateral size at a top surface of said soft magnetic part.
8. The vertical magnetic recording medium as claimed in claim 1 , further comprising another intermediate layer of a non-magnetic material between said soft magnetic backing layer and said magnetic flux confinement layer.
9. A magnetic storage apparatus, comprising:
a recording and playback part having a magnetic head; and
a vertical magnetic recording medium having a recording layer including a track region recorded with information by a magnetic head and an inter-track region separating said track region from an adjacent track region offset in position from said track region in a width direction thereof, said track region and said inter-track region being formed magnetically in said magnetic recording layer, said magnetic recording medium comprising:
a substrate;
a soft magnetic backing layer formed on said substrate;
a magnetic flux confinement layer formed on said soft magnetic backing layer;
an intermediate layer formed on said magnetic flux confinement layer; and
a recording layer of a vertical magnetization film formed on said intermediate layer,
wherein said magnetic flux confinement layer comprises a soft magnetic part formed along said track region and a non-magnetic part formed between said track region and said adjacent track region,
said intermediate layer comprises a non-magnetic material of an amorphous material or microcrystalline material and is formed so as to cover a surface of said soft magnetic parts and said non-magnetic parts, and
said soft magnetic part of said magnetic flux confinement layer comprises a soft magnetic material having a higher magnetic permeability than a soft magnetic material forming said soft magnetic backing layer.