EP0687941A2
Expired / Lapsed
EP
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Forming inverted ferroelectric domain regions
Assignee: Eastman Kodak Co
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Filing: 1995-06-14
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Granted: —
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Expires: 2015-06-14
Abstract
Abstract A method for forming inverted ferroelectric domain regions in a substrate including ferroelectric material and having two major opposite surfaces comprising the steps of (a) chemically modifying the substrate in selected regions to inhibit subsequent nucleation and growth of selected domains; (b) applying a conductive electrode over the opposite major surfaces; and (c) providing a voltage to the conductive electrodes having a sufficient magnitude and duration to cause the ferroelectric polarization to invert in selected unmodified regions.
Inventors
- 👤 Cynthia J. C/O Eastman Kodak Company Baron
- 👤 Jose M. C/O Eastman Kodak Company Mir
- 👤 Eric J. C/O Eastman Kodak Company Lim
- 👤 Mool C. C/O Eastman Kodak Company Gupta
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 04:45
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/355; G02F1/3558
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
79 words
A method for forming inverted ferroelectric domain regions in a substrate including ferroelectric material and having two major opposite surfaces, said method comprising the steps of: a. chemically modifying the substrate in selected regions to inhibit subsequent nucleation and growth of selected domains; b. applying a conductive electrode over said opposite major surfaces; and c. providing a voltage to the conductive electrodes having a sufficient magnitude and duration to cause the ferroelectric polarization to invert in selected unmodified regions.
Claim 2
Independent Claim
87 words
A method for forming inverted ferroelectric domain regions in a substrate including ferroelectric material having two major opposite surfaces, said method comprising the steps of: a. forming a domain control pattern in one of said two major surfaces of said substrate, said pattern inhibiting the nucleation and growth of selected domains; b. applying a conductive electrode over said two major opposite surfaces; and c. providing a voltage to the conductive electrodes having a sufficient magnitude and duration to cause the ferroelectric polarization to invert in selected regions.
Claim 3
Independent Claim
98 words
A method for forming inverted ferroelectric domain regions in a ferroelectric material, said method comprising the steps of: a. forming and patterning a nonconductive layer on a ferroelectric substrate with such pattern being characterized with openings to the material; b. applying a conductive layer over the nonconductive layer filling in the openings on said surface and the surface opposite on the ferroelectric material; and c. applying a voltage to the conductive electrodes having a sufficient magnitude and duration to cause the ferroelectric polarization to invert in selected regions beneath the openings in accordance to said domain control pattern.
Claim 4
Dependent Claim
19 words
The invention as set forth in claim 1 wherein the chemical modification is achieved by doping the ferroelectric material.
Claim 5
Dependent Claim
22 words
The invention as set forth in claim 1 wherein the chemical modification is achieved by removing a constituent of the ferroelectric material.
Claim 6
Dependent Claim
31 words
The invention as set forth in claim 4 wherein the dopant is selected from the group consisting of: H, Nb₂O₃, Ta₂O₃, Ti, Nb, Ta, Rb, Cs, Si, Mg, Li, and He.
Claim 7
Dependent Claim
27 words
The invention as set forth in claim 5 wherein the constituent removed is selected from the group consisting of Li, O, Nb, Ta, K, Ti, and P.
Claim 8
Dependent Claim
44 words
The invention as set forth in claim 1 wherein the conductive electrode is selected from the group consisting of: Au, Ag, Pt, Pd, Al, Ga, In, Ta, Ti, Nb, and other similar metal and metal oxides and soluble alkali, alkaline earth and metal salts.
Claim 9
Dependent Claim
41 words
The invention as set forth in claim 1 wherein the voltage is applied as DC, ramp, or a pulse of magnitude equal to or greater than the coercive voltage of the ferroelectric material and of duration from .001 to 10,000 msec.
Claim 10
Dependent Claim
44 words
The invention as set forth in claim 2 wherein the conductive electrode is selected from the group consisting of: Au, Ag, Pt, Pd, Al, Ga, In, Ta, Ti, Nb, and other similar metal and metal oxides and soluble alkali, alkaline earth and metal salts.
References Cited (Backward Citations)
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