Patricia D Beck

US Patent:

6458621, Oct 1, 2002

Filed:

Aug 1, 2001

Appl. No.:

09/920994

Inventors:

Patricia A. Beck - Palo Alto CA

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

H01L 2100

US Classification:

438 99, 438 1, 438800, 365151

Abstract:

An improved method of fabricating nanometer-scale devices is provided, wherein the improvement comprises: (1) employing materials for a first electrode, a first insulating layer, if present, a molecular switch layer, a second insulating layer, if present, and a second electrode that permit photopatterning of the second electrode; and (2) photopatterning at least the second electrode without adversely affecting the molecular switch layer. The improved method incorporates known techniques on a smaller scale than previously done to provide a means to move away from shadow mask electrodes (many micrometers wide), presently used in nanometer-scale devices, and move to nanometer dimensions. The improved method further facilitates integration of nanometer-scale devices to larger silicon-based technology.

US Patent:

6599796, Jul 29, 2003

Filed:

Jun 29, 2001

Appl. No.:

09/896480

Inventors:

Ping Mei - Palo Alto CA
Carl P. Taussig - Redwood City CA
Patricia A. Beck - Palo Alto CA

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

H01L 218242

US Classification:

438243, 438239, 438244, 438252, 438600, 438601, 438131, 438132, 257104, 257577, 257594, 365105, 365208, 365243, 365165, 365175

Abstract:

A cross point memory array is fabricated on a substrate with a plurality of memory cells, each memory cell including a diode and an anti-fuse in series. First and second conducting materials are disposed in separate strips on the substrate to form a plurality of first and second orthogonal electrodes with cross points. A plurality of semiconductor layers are disposed between the first and second electrodes to form a plurality of diodes between the cross points of the first and second electrodes. A passivation layer is disposed between the first electrodes and the diodes to form a plurality of anti-fuses adjacent to the diodes at the cross points of first and second electrodes. Portions of the diode layers are removed between the electrode cross points to form the plurality of memory cells with rows of trenches between adjacent memory cells to provide a barrier against crosstalk between adjacent memory cells. The trenches extend substantially to the depth of the n-doped layer in each diode. A process for fabricating the memory array includes formation of the anti-fuse above the diode in each memory cell and extending the passivation material into the trenches as the isolation material.

US Patent:

6647613, Nov 18, 2003

Filed:

Feb 22, 2001

Appl. No.:

09/791903

Inventors:

Patricia A. Beck - Palo Alto CA
Paul W. Poorman - Meridian ID
Richard H. Henze - San Carlos CA

Assignee:

Hewlett-Packard Development Company, LP. - Houston TX

International Classification:

G11B 542

US Classification:

2960313, 2960307, 296032, 2960316, 29412, 29417, 360120, 360122

Abstract:

A batch fabrication technique is described that increases the manufacturing efficiency of servo write heads and also improves servo pattern definition for fine features, while reducing tape and head wear. Multiple heads are fabricated as a batch from one or more ferrite wafers. A nominally flat, large wafer surface and a contour suitable for uniform photoresist application an planar photolithography permit fine servo pattern definition with low linewidth variation. Non-magnetic material is photolithographically defined to produce gaps above a spacer. The non-magnetic material may be photoresist, semiconductor materials, glass, metal or the like. The material may even be removed later to leave air gaps. Additionally, a lower ferrite wafer may be mated to the upper ferrite wafer to complete a magnetic circuit around the gaps. A rounded leading edge on the head creates an air bearing to reduce ware of the tape and of the head.

US Patent:

6700729, Mar 2, 2004

Filed:

Oct 17, 2000

Appl. No.:

09/691646

Inventors:

Patricia A. Beck - Palo Alto CA

Assignee:

Hewlett-Packard Development Company - Houston TX

International Classification:

G11B 2020

US Classification:

360 76, 360 7712

Abstract:

A device for precision alignment of a write element of a tape head to a transport direction of a media that is transported across the tape head is disclosed. The tape head includes at least one alignment element that is cofabricated with the write element so that both the write element and the alignment element have a fixed orientation with respect to a magnetic axis of the tape head. The alignment element and the write element can be fabricated on the tape head using standard microelectronic photolithographic processes. Preferably, the tape head includes a plurality of alignment elements. Those alignment elements are operative to write alignment transitions onto the media. The alignment transitions can be observed to determine if they are indicative of the write element having a predetermined orientation with respect to the transport direction. A read transducer can be used to generate signals from the alignment transitions and those signals can be analyzed to determine if the predetermined orientation of the write element has been achieved. The tape head can include horizontal and/or vertical elements for a gross visual alignment of the tape head to the media.

US Patent:

6855647, Feb 15, 2005

Filed:

Apr 2, 2003

Appl. No.:

10/405294

Inventors:

Patricia A. Beck - Palo Alto CA, US
Douglas Ohlberg - Mountain View CA, US
Duncan Stewart - Menlo Park CA, US
Zhiyong Li - Mountain View CA, US

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

H01L021/26

US Classification:

438795, 438798, 438474, 438513, 438691

Abstract:

A method is provided for fabricating molecular electronic devices comprising at least a bottom electrode and a molecular switch film on the bottom electrode. The method includes forming the bottom electrode by a process including: cleaning portions of the substrate where the bottom electrode is to be deposited; pre-sputtering the portions; depositing a conductive layer on at least the portions; and cleaning the top surface of the conductive layer. Advantageously, the conductive electrode properties include: low or controlled oxide formation (or possibly passivated), high melting point, high bulk modulus, and low diffusion. Smooth deposited film surfaces are compatible with Langmuir-Blodgett molecular film deposition. Tailored surfaces are further useful for SAM deposition. The metallic nature gives high conductivity connection to molecules.

US Patent:

6898045, May 24, 2005

Filed:

Nov 26, 2003

Appl. No.:

10/723757

Inventors:

Patricia A. Beck - Palo Alto CA, US

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

G11B020/20
G11B005/00
G11B005/584

US Classification:

360 76, 360 7712

Abstract:

A device for precision alignment of a write element of a tape head to a transport direction of a media that is transported across the tape head is disclosed. The tape head includes at least one alignment element that is cofabricated with the write element so that both the write element and the alignment element have a fixed orientation with respect to a magnetic axis of the tape head. The alignment element and the write element can be fabricated on the tape head using standard microelectronic photolithographic processes. Preferably, the tape head includes a plurality of alignment elements. Those alignment elements are operative to write alignment transitions onto the media. The alignment transitions can be observed to determine if they are indicative of the write element having a predetermined orientation with respect to the transport direction. A read transducer can be used to generate signals from the alignment transitions and those signals can be analyzed to determine if the predetermined orientation of the write element has been achieved. The tape head can include horizontal and/or vertical elements for a gross visual alignment of the tape head to the media.

US Patent:

6999274, Feb 14, 2006

Filed:

Sep 27, 2002

Appl. No.:

10/256572

Inventors:

Patricia A. Beck - Palo Alto CA, US
Paul W. Poorman - Meridian ID, US
Richard H. Henze - San Carlos CA, US

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

G11B 5/187

US Classification:

360122, 360119, 360121, 360125

Abstract:

A servo head for magnetic tape is provided. The head includes a substantial planar head surface. The head includes a leading edge that is disposed adjacent to the head surface such that the tape contacts the leading edge before passing over the head surface. The leading edge includes a rounded portion so as to form an air bearing between the head surface and the tape. The leading edge can include an abrupt change in slope at the leading edge. Alternatively, the leading edge can include a smooth transition.

US Patent:

7144683, Dec 5, 2006

Filed:

Oct 30, 2003

Appl. No.:

10/697144

Inventors:

Patricia A. Beck - Palo Alto CA, US
Xiao-An Zhang - Sunnyvale CA, US

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

G03F 7/00

US Classification:

430311, 4302701

Abstract:

Bistable molecules are provided with at least one photosensitive functional group. As thus constituted, the bistable molecules are photopatternable, thereby allowing fabrication of micrometer-scale and nanometer-scale circuits in discrete areas without relying on a top conductor as a mask. The bistable molecules may comprise molecules that undergo redox reactions, such as rotaxanes and catenanes, or may comprise molecules that undergo an electric-field-induced band gap change that causes the molecules, or a portion thereof, to rotate, bend, twist, or otherwise change from a substantially fully conjugated state to a less conjugated state. The change in states in the latter case results in a change in electrical conductivity.