Claims
- 1. A magnetic recording medium comprising a non-magnetic substrate having thereon a first non-magnetic underlayer and a magnetic layer comprising a Co alloy provided on the non-magnetic underlayer, wherein said non-magnetic underlayer comprises an alloy represented by the formula: (Ni50Al)100−XMX, wherein M is one of Cr (X=1-40 at %), Mo (X=1-50 at %), W (X=1-60 at %), V (X=1-35 at %), Zr (X=1-25 at %), Nb (X=1-35 at %) and Pd (X=1-25 at %), and wherein M also includes two or more of Cr, Mo, W, V, Zr, Nb and Pd, when X is from 1 to 60 at %.
- 2. The magnetic recording medium as claimed in claim 1, further comprising a second underlayer comprising Cr or a Cr alloy comprising Cr and one or more of Ti, Mo, Al, Ta, W, Ni, B, Si and V provided between said first underlayer and said magnetic layer.
- 3. The magnetic recording medium as claimed in claim 1, wherein the (Ni50Al)100−XMX alloy of said first underlayer has a lattice constant of 2.88 Å or more.
- 4. The magnetic recording medium as claimed in claim 2, wherein the (Ni50Al)100−XMX alloy of said first underlayer has a lattice constant of 2.88 Å or more.
- 5. The magnetic recording medium as claimed in claim 1, wherein the (Ni50Al)100−XMX alloy of said first underlayer has a lattice constant of from 2.91 to 3.03 Å.
- 6. The magnetic recording medium as claimed in claim 2, wherein the (Ni50Al)100−XMX alloy of said first underlayer has a lattice constant of from 2.91 to 3.03 Å.
- 7. The magnetic recording medium as claimed in claim 1, wherein said non-magnetic substrate is selected from the group consisting of an Al substrate plated with NiP, a glass substrate and a silicon substrate.
- 8. The magnetic recording medium as claimed in claim 2, wherein said non-magnetic substrate is selected from the group consisting of an Al substrate plated with NiP, a glass substrate and a silicon substrate.
- 9. The magnetic recording medium as claimed in claim 1, wherein said magnetic layer comprises a CoCrPtTa alloy.
- 10. The magnetic recording medium as claimed in claim 2, wherein said magnetic layer comprises a CoCrPtTa alloy.
- 11. The magnetic recording medium as claimed in claim 2, wherein said second underlayer is laminated on said first underlayer.
- 12. The magnetic recording medium as claimed in claim 1, wherein X in the formula (Ni50Al)100−XMX is from 1 to 50 at % when M comprises two or more of Cr, Mo, W, V, Zr, Nb and Pd.
- 13. The magnetic recording medium as claimed in claim 1, further comprising a protective layer provided on said magnetic layer.
- 14. The magnetic recording medium as claimed in claim 1, wherein the magnetic layer comprises a Co(100−X−Y−Z)CrXPtYTaZ alloy wherein 13 at % ≦X≦24 at %, 1 at % ≦Y≦12 at % and 2 at % ≦Z≦7 at %.
- 15. The magnetic recording medium as claimed in claim 1, wherein said first underlayer has a thickness of from 25 to 1,500 Å.
- 16. A non-magnetic alloy film having a composition of (Ni50Al)100−XMX, wherein is one of Cr (X=1-40 at %), Mo (X=1-50 at %), W (X=1-60 at %), V (X=1-35 at %), Zr (X=1-25 at %), Nb (X=1-35 at %) and Pd (X=1-25 at %), and wherein M also comprises two or more of Cr, Mo, W, V, Zr, Nb and Pd, when X is from 1 to 60 at %.
- 17. A sputtering target comprising a sintered alloy having a composition of (Ni50Al)100−XMX, wherein M is one of Cr (X=1-40 at %), Mo (X=1-50 at %), W (X=1-60 at %), V (X=1-35 at %), Zr (X=1-25 at %), Nb (X=1-35 at %) and Pd (X=1-25 at %), and wherein M also comprises two or more of Cr, Mo, W, V, Zr, Nb and Pd, when X is from 1 to 60 at %.
Priority Claims (2)
Number |
Date |
Country |
Kind |
9-267469 |
Sep 1997 |
JP |
|
9-307658 |
Nov 1997 |
JP |
|
CROSS REFERENCE TO RELATED APPLICATIONS
This application is an application filed under 35 U.S.C. §111 (a) claiming benefit pursuant to 35 U.S.C. §119(e) (1) of the filing date of the Provisional Application No. 60/069,646 filed Dec. 9, 1997 pursuant to 35 U.S.C. §111(b).
US Referenced Citations (3)
Provisional Applications (1)
|
Number |
Date |
Country |
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60/069646 |
Dec 1997 |
US |