Ting Pong Yuen

US Patent:

RE37748, Jun 18, 2002

Filed:

Jul 17, 2000

Appl. No.:

09/618137

Inventors:

Tu Chen - Monte Sereno CA
Tsutomu Tom Yamashita - San Jose CA
Rajiv Yadav Ranjan - San Jose CA
John Ko-Chen Chen - Los Gatos CA
Keith Kadokura - Cupertino CA
Ting Joseph Yuen - Fremont CA

Assignee:

Komag, Inc. - San Jose CA

International Classification:

G11B 566

US Classification:

2041922, 427128, 427129, 427130, 427131, 428694 T, 428900

Abstract:

A Co-Pt based magnetic alloy which has been doped with a relatively high amount of nitrogen, e. g. , or above 1 at. % is obtained having high coercivity, for example in the range of 1400 Oe or above, and an increased signal-to-noise ratio as compared to the same Co-Pt based alloy which has not been doped with nitrogen. The alloy is vacuum deposited, for example, by sputtering, and the nitrogen may be introduced from the sputtering gas or from the sputtering target. Other low-solubility elements providing the grain uniformity and isolation include: B, P, S, C, Si, As, Se and Te.

US Patent:

RE38544, Jul 6, 2004

Filed:

Jul 17, 2000

Appl. No.:

09/618137

Inventors:

Tu Chen - Monte Sereno CA
Tsutomu Tom Yamashita - San Jose CA
Rajiv Yadav Ranjan - San Jose CA
John Ko-Chen Chen - Los Gatos CA
Keith Kadokura - Cupertino CA
Ting Joseph Yuen - Fremont CA

Assignee:

Komag, Inc. - San Jose CA

International Classification:

G11B 566

US Classification:

2041922, 427128, 427129, 427130, 427131, 428694 T, 428900

Abstract:

A Co-Pt based magnetic alloy which has been doped with a relatively high amount of nitrogen, e. g. , or above 1 at. % is obtained having high coercivity, for example in the range of 1400 Oe or above, and an increased signal-to-noise ratio as compared to the same Co-Pt based alloy which has not been doped with nitrogen. The alloy is vacuum deposited, for example, by sputtering, and the nitrogen may be introduced from the sputtering gas or from the sputtering target. Other low-solubility elements providing the grain uniformity and isolation include: B, P, S, C, Si, As, Se and Te.

US Patent:

60131616, Jan 11, 2000

Filed:

Oct 28, 1997

Appl. No.:

8/959144

Inventors:

Tu Chen - Monte Sereno CA
Tsutomu Tom Yamashita - Milpitas CA
John Ko-Jen Chen - Monte Sereno CA
Rajiv Yadav Ranjan - San Jose CA
Keith Kadokura - Cupertino CA
Ting Joseph Yuen - Fremont CA

Assignee:

Komag, Incorporated - San Jose CA

International Classification:

G11B 566

US Classification:

2041922

Abstract:

A Co--Pt based magnetic alloy which has been doped with a relatively high amount of nitrogen, e. g. , at or above 1 at. % is obtained having high coercivity, for example in the range of 1400 Oe or above, and an increased signal-to-noise ratio as compared to the same Co--Pt based alloy which has not been doped with nitrogen. The alloy is vacuum deposited, for example, by sputtering, and the nitrogen may be introduced from the sputtering gas or from the sputtering target. Other low-solubility elements providing the grain uniformity and isolation include: B, P, S, C, Si, As, Se and Te.

US Patent:

58516883, Dec 22, 1998

Filed:

Nov 20, 1997

Appl. No.:

8/974929

Inventors:

Tu Chen - Monte Sereno CA
Tsutomu Tom Yamashita - Milpitas CA
John Ko-Jen Chen - Monte Sereno CA
Rajiv Yadav Ranjan - San Jose CA
Keith Kadokura - Cupertino CA
Ting Joseph Yuen - Fremont CA

Assignee:

Komag, Inc.

International Classification:

G11B 566

US Classification:

428694T

Abstract:

A Co--Pt based magnetic alloy which has been doped with a relatively high amount of nitrogen, e. g. , at or above 1 at. % is obtained having high coercivity, for example in the range of 1400 Oe or above, and an increased signal-to-noise ratio as compared to the same Co--Pt based alloy which has not been doped with nitrogen. The alloy is vacuum deposited, for example, by sputtering, and the nitrogen may be introduced from the sputtering gas or from the sputtering target. Other low-solubility elements providing the grain uniformity and isolation include: B, P, S, C, Si, As, Se and Te.

US Patent:

56586590, Aug 19, 1997

Filed:

Aug 5, 1994

Appl. No.:

8/286653

Inventors:

Tu Chen - Monte Sereno CA
Rajiv Yadav Ranjan - San Jose CA
Tsutomu Tom Yamashita - Milpitas CA
Miaogen Lu - Fremont CA
Keith Kadokura - Cupertino CA
John Ko-Jen Chen - Monte Sereno CA
Ting Joseph Yuen - Fremont CA

Assignee:

Komag, Inc. - Milpitas CA

International Classification:

G11B 566
B32B 516
C23C 1400

US Classification:

428332

Abstract:

Media according to the present invention is comprised of individual magnetic grains as small as 300. ANG. or smaller in diameter, which are uniformly spaced apart by a distance between 5 and 50. ANG. by a solid segregant. This media will typically exhibit coercivity and remanent coercivity squareness of at least 0. 8 each, a switching field distribution of less than 0. 2, and a coercivity of at least 1500 Oe (with a minimum required Pt content), while simultaneously providing the lowest media jitter noise for optimum magnetic performance. The media is deposited at a low partial pressure of water and in the presence of an optimum amount of contributant gas on a doped nucleation layer for grain growth control.