High density magnetic recording medium having uniform local...

Details High density magnetic recording medium having uniform local... High density magnetic recording medium having uniform local...

2007-11-13

2007-11-13

Rickman, Holly (Department: 1773)

Stock material or miscellaneous articles

Magnetic recording component or stock

Thin film media

Reexamination Certificate

active

10675735

ABSTRACT:
Disclosed is herein a magnetic recording medium useful for high density magnetic recording, which contains an optimum composition of Pt so as to have a uniform local coercivity distribution and grain size distribution, and fine grains, and a method of manufacturing the same. The magnetic recording medium includes a 400 Å (Co82Cr18)100-xPtx/1100 Å Ti alloy thin film containing 1 to 14 atom % Pt. Additionally, the method includes a first step of layering a Ti thin film on a glass substrate, a second step of depositing a CoCrPt alloy thin film on the Ti thin film, and a third step of depositing Si3N4on the CoCrPt alloy thin film. At this time, the CoCrPt alloy thin film contains a predetermined composition of Pt controlled by a CoCr alloy target having a Pt chip positioned thereon. Thereby, the magnetic recording medium having microscopic magnetic property and structural property suitable to a high density magnetic recording medium is realized.

REFERENCES:
patent: 5605733 (1997-02-01), Ishikawa et al.
patent: 5879783 (1999-03-01), Chang et al.
patent: 5900323 (1999-05-01), Okamoto et al.
Sun et al., Long-range order and short-range order study on CoCrPt/Ti films by synchrotron x-ray scattering and extended x-ray absorption fine structure spectroscopy, May 2002, J Appl Phys, vol. 91, No. 10, 7182-7184.
An article entitled “Magnetic Recording Medium and Magnetic Disk Device”, By Kenhi Sato, dated Aug. 31, 1999.
An article entitled “Direct Observation of non-Gaussian Distribution of Local . . . ”, By Choe et al., dated 2002.

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