Jeffery L Petrehn

US Patent:

6524724, Feb 25, 2003

Filed:

Feb 9, 2001

Appl. No.:

09/779484

Inventors:

Yuanda Randy Cheng - San Jose CA
Connie Chunling Liu - San Jose CA
Chung Shih - Cupertino CA
Linda Lijun Zhong - Fremont CA
Jeff Duane St. John - Los Gatos CA
Jeffery Lee Petrehn - Fremont CA

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

G11B 566

US Classification:

428611, 428336, 428667, 428694 TS, 428900, 427128, 427129, 427131

Abstract:

High areal density magnetic recording media exhibiting low noise are formed with a NiâPâX plating layer, in which X is an additive meeting the following requirement: (1) The additive has a higher oxidation potential than that of Ni so that grains of an additive-rich-oxide will form first during oxidation under a controlled atmosphere and grains of a Ni-rich-oxide, if any, will form subsequently and separately from the grains of the additive-rich oxide. (2) The additive has a tendency to segregate to the top surface. (3) The additive is not a catalyst poison for NiâP plating in the composition range.

US Patent:

6749904, Jun 15, 2004

Filed:

May 6, 2002

Appl. No.:

10/138265

Inventors:

Connie Chunling Liu - San Jose CA
Li-Ping Wang - Fremont CA
Linda Lijun Zhong - Fremont CA
Jeffery Lee Petrehn - Fremont CA

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

B05D 300

US Classification:

427552, 427282, 427283, 427287, 4273722, 4275161, 4273763, 4273766, 4273833, 4273835, 427555, 427557, 427595, 427596, 427597, 427599

Abstract:

High areal storage density, patterned magnetic media comprising a patterned plurality of at least partially crystalline, ferromagnetic particles or grains are provided by means of a simple, economical process wherein a non-magnetic substrate is provided with a layer of an amorphous, paramagnetic or anti-paramagnetic material comprising at least one component, e. g. , a metal element, which is ferromagnetic when in at least partially crystalline form, and at least partially crystallizing the at least one component at selected areas of the amorphous layer to form a spaced-apart pattern of at least partially crystallized, ferromagnetic particles or grains of the at least one component, the particles or grains being spaced apart and surrounded by a matrix of the amorphous material. Embodiments include utilizing a focussed or scanned laser source and an amorphous NiâP layer for forming ferromagnetic Ni particles or grains.

US Patent:

6387530, May 14, 2002

Filed:

Jun 14, 2000

Appl. No.:

09/593243

Inventors:

Connie Chunling Liu - San Jose CA
Li-Ping Wang - Fremont CA
Linda Lijun Zhong - Fremont CA
Jeffery Lee Petrehn - Fremont CA

Assignee:

Seagate Technology LLC - Scotts Valley CA

International Classification:

B32B 1500

US Classification:

428559, 428637, 428668, 428611, 428332, 428546, 428649 B, 428694 BA, 428694 T, 428156, 428409

Abstract:

High areal storage density, patterned magnetic media comprising a patterned plurality of at least partially crystalline, ferromagnetic particles or grains are provided by means of a simple, economical process wherein a non-magnetic substrate is provided with a layer of an amorphous, paramagnetic or anti-paramagnetic material comprising at least one component, e. g. , a metal element, which is ferromagnetic when in at least partially crystalline form, and at least partially crystallizing the at least one component at selected areas of the amorphous layer to form a spaced-apart pattern of at least partially crystallized, ferromagnetic particles or grains of the at least one component, the particles or grains being spaced apart and surrounded by a matrix of the amorphous material. Embodiments include utilizing a focussed or scanned laser source and an amorphous NiâP layer for forming ferromagnetic Ni particles or grains.