Magneto-optical recording medium and manufacturing method therefor
AssigneeFujitsu Limited
InventorTetsuo Hosokawa
Life of this patent
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Abstract
A magneto-optical recording medium includes a magnetic reproducing layer having an axis of easy magnetization in a direction perpendicular to its layer surface, a magnetic intermediate layer formed on the magnetic reproducing layer and having an axis of easy magnetization in a plane at a room temperature, and a magnetic recording layer formed on the magnetic intermediate layer and having an axis of easy magnetization in a direction perpendicular to its layer surface. The magnetic reproducing layer has a composition of GdxFeCoy where 22 at %≦x≦25 at % and 16 at %≦y≦23 at %.
Claims9
A magneto-optical recording medium comprising:
- a magnetic reproducing layer having an axis of easy magnetization in a direction perpendicular to its layer surface;
- a magnetic intermediate layer formed on said magnetic reproducing layer and having an axis of easy magnetization in a plane at a room temperature;
- and
- a magnetic recording layer formed on said magnetic intermediate layer and having an axis of easy magnetization in a direction perpendicular to its layer surface;
- wherein said magnetic reproducing layer has a composition of GdxFeCoy where 22 at %≦x≦25 at % and 16 at %≦y≦23 at %.
A manufacturing method for a magneto-optical recording medium comprising a magnetic reproducing layer having an axis of easy magnetization in a direction perpendicular to its layer surface;
- a magnetic intermediate layer formed on said magnetic reproducing layer and having an axis of easy magnetization in a plane at a room temperature;
- and a magnetic recording layer formed on said magnetic intermediate layer and having an axis of easy magnetization in a direction perpendicular to its layer surface;
- said magnetic reproducing layer having a composition of GdxFeCoy where 22 at %≦x≦25 at % and 16 at %≦y≦23 at %, said manufacturing method comprising the step of:
- depositing said magnetic intermediate layer by sputtering at a sputter rate of 7 nm/sec to 9 nm/sec under an Ar gas pressure of 2 Pa to 4 Pa.
A magneto-optical recording medium comprising:
- a GdFeCo reproducing layer having an axis of easy magnetization in a direction perpendicular to its layer surface, said reproducing layer having a thickness of 40 to 57 nm;
- a GdFeCoSi intermediate layer formed on said reproducing layer and having an axis of easy magnetization in a plane at a room temperature, said intermediate layer having a thickness of 38 to 50 nm;
- and
- a TbFeCo recording layer formed on said intermediate layer and having an axis of easy magnetization in a direction perpendicular to its layer surface,
- wherein said reproducing layer has a composition of GdxFeCoy where 22 at %≦x≦25 at % and 16 at %≦y≦23 at %.
A manufacturing method for a magneto-optical recording medium comprising a GdFeCo reproducing layer having an axis of easy magnetization in a direction perpendicular to its layer surface, said reproducing layer having a thickness of 40 to 57 nm;
- a GdFeCoSi intermediate layer formed on said reproducing layer and having an axis of easy magnetization in a plane at a room temperature, said intermediate layer having a thickness of 38 to 50 nm;
- and a TbFeCo recording layer formed on said intermediate layer and having an axis of easy magnetization in a direction perpendicular to its layer surface;
- said reproducing layer having a composition of GdxFeCoy where 22 at %≦x≦25 at % and 16 at %≦y≦23 at %, said manufacturing method comprising the step of:
- depositing said intermediate layer by sputtering at a sputter rate of 7 nm/sec to 9 nm/sec under an Ar gas pressure of 2 Pa to 4 Pa.
Dependencies are inferred from the claim text.