US5625587A
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Rare earth manganate films made by metalorganic decomposition or metalorganic chemical vapor deposition for nonvolatile memory devices
Assignee: Sharp Corp
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Filing: 1995-07-12
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Granted: 1997-04-29
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Expires: 2015-07-12
Abstract
Abstract A ferroelectric memory device having a perovskite thin film of a rare earth manganate and processes for manufacturing the same. The perovskite thin film layer has properties consistent with high quality nonvolatile memory devices. The perovskite thin film layer can be applied by a MOCVD process, by a MOD process, or a liquid source delivery process, all of which are described.
Inventors
- 👤 Chien-Hsiung Peng
- 👤 Seshu B. Desu
- 👤 Jie Si
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:34
CPC Classifications
H; H10; H10B; H10B53/00; H10D; H10D64/00; H10D64/60; H10D64/66; H10D64/68; H10D64/689
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
182 words
A memory device, comprising: a substrate; a film of a rare earth manganate; and at least one electrode on the film; wherein said film is produced by a process of metalorganic chemical vapor deposition including as a precursor at least one of (CH 3 C 5 H 4 )Mn(CO) 3 ); A(C 11 H 19 O 2 ) 3 , A being selected from the group consisting of Y, Ho, Er, Tm, Yb, and Lu; an alkyl of an element selected from the group consisting of Mn, Y, Ho, Er, Tm, Yb, and Lu; an alkoxide of an element selected from the group consisting of Mn, Y, Ho, Er, Tm, Yb, and Lu; a beta-diketonate of an element selected from the group consisting of Mn, Y, Ho, Er, Tm, Yb, and Lu; a metallocene of an element selected from the group consisting of Mn, Y, Ho, Er, Tm, Tb, and Lu; or a combination of at least two of an alkyl, alkoxide, beta-diketonate and a metallocene of elements selected from the group consisting of Mn, Y, Ho, Er, Tm, Tb, and Lu.
Claim 2
Dependent Claim
182 words
A memory device, comprising: a substrate; a film of a rare earth manganate; and at least one electrode on the film; wherein said film is produced by a process of metalorganic chemical vapor deposition including as a precursor at least one of (CH 3 C 5 H 4 )Mn(CO) 3 ); A(C 11 H 19 O 2 ) 3 , A being selected from the group consisting of Y, Ho, Er, Tm, Yb, and Lu; an alkyl of an element selected from the group consisting of Mn, Y, Ho, Er, Tm, Yb, and Lu; an alkoxide of an element selected from the group consisting of Mn, Y, Ho, Er, Tm, Yb, and Lu; a beta-diketonate of an element selected from the group consisting of Mn, Y, Ho, Er, Tm, Yb, and Lu; a metallocene of an element selected from the group consisting of Mn, Y, Ho, Er, Tm, Tb, and Lu; or a combination of at least two of an alkyl, alkoxide, beta-diketonate and a metallocene of elements selected from the group consisting of Mn, Y, Ho, Er, Tm, Tb, and Lu.
Claim 3
Dependent Claim
77 words
The memory device of claim 1, comprising: a substrate; a film of a rare earth manganate; and at least one electrode on the film of the formula A 3+ MnO 3 , where A is selected from the class consisting of Y, Ho, Er, Tm, Yb, and Lu; wherein said film is produced by a process of metalorganic decomposition including use of at least one of yttrium acetate and manganese and manganese(III) acetate as a starting material.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-04-28 | 2000-10-28 | 2001-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-04-28 | 2004-10-28 | 2005-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-04-28 | 2008-10-28 | 2009-04-29 | $7700.00 | Window Closed / Lapsed |