Magnetic recording medium and method for manufacturing the same
AssigneeFuji Electric Co., Ltd.
InventorsHiroyuki Uwazumi, Naoki Takizawa, Noboru Kurata
Life of this patent
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Abstract
A magnetic recording medium includes an uneven layer, a non-magnetic metal base layer, a magnetic layer and a protective layer which are laminated on a non-magnetic base in the order of description. The uneven layer includes non-magnetic metal deposits containing nitrogen or oxygen, and consists of mutually isolated protrusions having a crystalline phase, which are discretely dispersed on the surface of the non-magnetic base, and a connecting layer having an amorphous phase for filling spaces between the protrusions so as to connect the protrusions with each other.
Claims11
A magnetic recording medium comprising:
- a non-magnetic base;
- an uneven layer including non-magnetic metal deposits containing at least one of nitrogen and oxygen, laminated on a surface of said non-magnetic base, wherein said uneven layer includes mutually isolated protrusions having a crystalline phase, which are discretely dispersed on the surface of the non-magnetic base, and a connecting layer having an amorphous phase for filling spaces between said protrusions so as to connect the protrusions with each other;
- a non-magnetic metal base layer laminated on said uneven layer;
- a magnetic layer laminated on said non-magnetic metal base layer;
- and
- a protective layer laminated on said magnetic layer;
- wherein the connecting layer is thinner than the protrusions and prevents the non-magnetic base from contacting the non-magnetic metal base layer.
A method of manufacturing a magnetic recording medium, comprising the steps of:
- forming an uneven layer including non-magnetic metal deposits containing nitrogen on a surface of a non-magnetic base, by a sputtering process conducted in a sputtering gas mixture comprising an argon gas and a nitrogen gas, with said non-magnetic base heated to a predetermined temperature, said uneven layer including mutually isolated protrusions having a crystalline phase, which are discretely dispersed on the surface of the non-magnetic base, and a connecting layer having an amorphous phase for filling spaces between said protrusions so as to connect the protrusions with each other, and wherein the connecting layer is thinner than the protrusions and prevents the non-magnetic base from contacting the non-magnetic metal base layer;
- laminating a non-magnetic metal base layer on said uneven layer;
- laminating a magnetic layer on said non-magnetic metal base layer;
- and
- laminating a protective layer on said magnetic layer.
A method of manufacturing a magnetic recording medium, comprising the steps of:
- forming an uneven layer including non-magnetic metal deposits containing oxygen on a surface of a non-magnetic base, by a sputtering process conducted in a sputtering gas mixture comprising an argon gas and an oxygen gas, with said non-magnetic base heated to a predetermined temperature, said uneven layer including mutually isolated protrusions having a crystalline phase, which are discretely dispersed on the surface of the non-magnetic base, and a connecting layer having an amorphous phase for filling spaces between said protrusions so as to connect the protrusions with each other, and wherein the connecting layer is thinner than the protrusions and prevents the non-magnetic base from contacting the non-magnetic metal base layer;
- laminating a non-magnetic metal base layer on said uneven layer;
- laminating a magnetic layer on said non-magnetic metal base layer;
- and
- laminating a protective layer on said magnetic layer.
Dependencies are inferred from the claim text.