Magnetic recording medium and method for manufacturing the same
AssigneeFuji Electric Co., Ltd.
InventorsKeiji Ohkubo, Naoki Takizawa
Life of this patent
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Abstract
In a magnetic recording medium in which at least Cr or Cr-alloy base layer and Co-alloy magnetic layer are formed in this order on a substrate, a seed layer is provided between the substrate and the base layer. In a preferred embodiment, the seed layer is made of a material selected from Al--Co, Cu--Si, Ni--Ga, Cu--Be, Mn--V, Ni--Zn and Fe--V each having a specific composition. Where the substrate is formed of a glass material, the base layer and magnetic layer are formed by sputtering on the substrate while the substrate is kept at a temperature of 150.degree. to 300.degree. C. and a bias voltage of -300 to 0 V is applied to the substrate.
Claims13
A magnetic recording medium comprising:
- a substrate;
- a base layer made of one of Cr and an alloy containing Cr, said base layer being laminated on said substrate;
- a magnetic layer made of an alloy containing Co and laminated on said base layer;
- and
- a seed layer provided between said substrate and said base layer,
- wherein said seed layer is made of a material selected from the group consisting of Al.sub.1-x --Co.sub.x in which 0.45.ltoreq.x.ltoreq.0.65, Cu.sub.1-x --Si.sub.x in which 0.10.ltoreq.x.ltoreq.0.20, Ni.sub.1-x --Ga.sub.x in which 0.35.ltoreq.x.ltoreq.0.60, Cu.sub.1-x --Be.sub.x in which 0.30.ltoreq.x.ltoreq.0.60, Mn.sub.1-x --V.sub.x in which 0.01.ltoreq.x.ltoreq.0.10, Ni.sub.1-x --Zn.sub.x in which 0.40.ltoreq.x.ltoreq.0.60, and Fe.sub.1-x --V.sub.x in which 0.45.ltoreq.x.ltoreq.0.55.
A magnetic recording medium comprising:
- a substrate;
- a base layer made of one of Cr and an alloy containing Cr, said base layer being laminated on said substrate;
- a magnetic layer made of an alloy containing Co and laminated on said base layer;
- a seed layer provided between said substrate and said base layer made of a material selected from the group consisting of Al.sub.1-x --Co.sub.x in which 0.45.ltoreq.x.ltoreq.0.65, Cu.sub.1-x --Si.sub.x in which 0.10.ltoreq.x.ltoreq.0.20, Ni.sub.1-x --Ga.sub.x in which 0.35.ltoreq.x.ltoreq.0.60, Cu.sub.1-x --Be.sub.x in which 0.30.ltoreq.x.ltoreq.0.60, Mn.sub.1-x --V.sub.x in which 0.01.ltoreq.x.ltoreq.0.10, Ni.sub.1-x --Zn.sub.x in which 0.40.ltoreq.x.ltoreq.0.60, and Fe.sub.1-x --V.sub.x in which 0.45.ltoreq.x.ltoreq.0.55;
- and
- an uneven layer with minute protrusions and recesses between seed layer and said base layer.
Dependencies are inferred from the claim text.