Information processing apparatus, and electrode substrate and information recording medium used in the apparatus

• US 5,329,514 A
• Filed: 07/27/1992
• Issued: 07/12/1994
• Est. Priority Date: 07/31/1991
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Takeda, Toshihiko, Eguchi, Ken, Takimoto, Kiyoshi, Kawada, Haruki
• Primary Examiner(s): Dzierzynski, Paul M.
• Assistant Examiner(s): WONG, DON KITSUN
• Application Number:
  US07/919,273
• Time in Patent Office: 715 Days
• Field of Search: 369/275.1-275.4, 369/126, 250/306, 346/135.1
• US Class Current: 369/126
• CPC Class Codes: B82Y 10/00 Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
• CPC Class Codes: C30B 29/02 Elements
• CPC Class Codes: C30B 7/00 Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions from molten solvents C30B9/00; by normal or gradient freezing C30B11/00; under a protective fluid C30B27/00
• CPC Class Codes: C30B 7/005 Epitaxial layer growth
• CPC Class Codes: G11B 9/1463 Record carriers for recording or reproduction involving the use of microscopic probe means
• CPC Class Codes: G11B 9/1472 characterised by the form
• CPC Class Codes: G11C 13/0014 comprising cells based on organic memory material

Abstract

An electrode substrate includes a substrate and an electrode layer of a noble metal crystal formed on the substrate, the noble metal crystal exhibiting a substantially linear domain boundary and a plane orientation dispersion angle in X-ray analysis of 1° or less. An information recording medium includes an electrode substrate as described above and a recording layer provided on the electrode layer. An information processing apparatus includes: an information recording medium as described above; a probe electrode arranged in close proximity to this medium; and a voltage applying circuit for applying a pulse/bias voltage between the medium and the probe electrode, information being written/read onto/from the medium by the application of the pulse/bias voltage. An information processing method includes the steps of: preparing an information recording medium as described above; arranging a probe electrode in close proximity to the medium; and applying a pulse/bias voltage between the medium and the probe electrode so as to write/read information onto/from the medium.

Claims

1. An electrode substrate comprising a substrate and at least one noble metal planar crystal formed on said substrate as an electrode layer wherein said noble metal planar crystal is made of a single crystal having an electrode surface forming at least a facet of (111) plane orientation and a boundary of said single crystal surface is substantially linear.

2. An electrode substrate according to claim 1, wherein said substrate comprises a noble metal electrode thin film made of said planar crystal having a plane orientation dispersion angle measuring 1°

or less by ray analysis.

3. An electrode substrate according to claim 1, wherein said noble metal crystal has an aspect ratio of at least 10.

4. An electrode substrate according to claim 1, wherein said substrate comprises a conductive substrate and an insulating layer formed on said conductive substrate.

5. An electrode substrate according to claim 4, wherein said insulating layer has a through-hole communicating with said conductive substrate, wherein said noble metal crystal is produced by crystal growth from said conductive substrate through said through-hole.

6. An electrode substrate according to claim 1 or 2, wherein said planar crystal has a crystal surface exhibiting a plane-orientation dispersion angle of no more than about 0.6°

.

7. An electrode substrate according to claim 1, wherein a maximum surface irregularity in an in-plane area of 1μ

m×

1μ

m of said electrode layer is not more than about 1nm.

8. An electrode substrate according to one of claims 1-5 employed in a recording medium, said electrode layer being a recording layer.

9. An information recording medium comprising a substrate, at least one noble metal planar crystal formed on said substrate, as an electrode layer and a recording layer provided on said electrode layer, wherein said noble metal planar crystal is made of a single crystal having an electrode surface forming at least a facet of (111) plane orientation and a boundary of said single crystal surface is substantially linear.

10. An information recording medium according to claim 9, wherein said substrate comprises a noble metal electrode thin film made of said planar crystal having a plane orientation dispersion angle measuring 1°

or less by X-ray analysis.

11. An information recording medium according to claim 9, wherein said noble metal crystal has an aspect ratio of at least 10.

12. An information recording medium according to claim 9, wherein said said substrate comprises a conductive substrate and a insulating layer formed on said conductive substrate.

13. An information recording medium according to claim 12, wherein said insulating layer has a through-hole communicating with said conductive substrate, wherein said noble metal crystal is produced by crystal growth from said conductive substrate through said through-hole.

14. An information recording medium according to claim 9, wherein said planar crystal has a crystal surface exhibiting a plane-orientation dispersion angle of no more than about 0.6°

.

15. An information recording medium according to claim 9, wherein a maximum surface irregularity in an in-plane area of 1μ

m×

1μ

m of said electrode layer is not more than about 1nm.

16. An information recording medium according to claim 9, wherein said recording layer comprises at least one layer of a monomolecular film of an organic compound.

17. An information recording medium according to claim 9, wherein said recording layer has a thickness of between about 5 to about 300 Å

.

18. An information recording medium according to claim 9, wherein said recording layer records information as changes in physical conditions.

19. An information recording medium according to claim 9, wherein said recording layer has a memory effect.

20. An information recording medium according to claim 9, further comprising a track.

21. An information processing apparatus comprising:

an information recording medium, said information recording medium comprising a substrate, at least one noble metal planar crystal formed on said substrate, as an electrode layer, and a recording layer provided on said electrode layer, wherein said noble metal planar crystal is made of a single crystal having an electrode surface forming at least a facet of (111) plane orientation and a boundary of said single crystal surface is substantially linear;

a probe electrode disposed in close proximity to said medium;

a first voltage applying circuit for applying a pulse voltage between said medium and said probe electrode;

a second voltage applying circuit for applying a bias voltage between said medium and said probe electrode;

wherein

information is written onto said medium by an application of said pulse voltage and said information is readable from said medium by an application of said bias voltage.

22. An information recording medium according to claim 21, wherein said recording layer comprises at least one layer of a monomolecular film of an organic compound.

23. An information processing apparatus according to claim 21, wherein said recording layer has a thickness of between about 5 to about 300 Å

.

24. An information processing apparatus according to claim 21, wherein said information is written on said recording layer in accordance with physical conditions.

25. An information processing apparatus according to claim 21, wherein said recording layer has memory effect.

26. An information processing apparatus according to claim 21, further comprising a track.

28. An information processing apparatus according to claim 21, further comprising a plurality of said probe electrodes.

31. An information processing apparatus according to claim 21, wherein said substrate comprises a noble metal electrode thin film made of said planar crystal having a plane orientation dispersion angle measuring 1°

or less by X-ray analysis.

27. An information processing apparatus comprising:

an information recording medium, said information recording medium comprising a substrate, an electrode layer of a noble metal crystal joined on said substrate, and a recording layer provided on said electrode layer, said noble metal crystal exhibiting a substantially linear domain boundary and a plane orientation dispersion angle measured by X-ray analysis of no more than about 1°

;

a probe electrode disposed in close proximity to said medium;

a first voltage applying circuit for applying a pulse voltage between said medium and said probe electrode;

a second voltage applying circuit for applying a bias voltage between said medium and said probe electrode;

wherein

information is written onto said medium by an application of said pulse voltage and said information is readable from said medium by an application of said bias voltage.

29. An information processing method comprising the steps of:

providing an information recording medium, comprising a substrate, at least one noble metal planar crystal formed on said substrate as an electrode layer and a recording layer provided on said electrode layer, wherein said noble planar metal crystal is made of a single crystal having an electrode surface forming at least a facet of (111) plane orientation and a boundary of said single crystal surface is substantially linear, said recording layer consisting of at least one layer of monomolecular film of an organic compound, wherein said recording layer has a thickness ranging from about 5 to about 300 Å

, has a memory effect, and further comprises a track;

arranging a probe electrode in close proximity to said medium;

applying a pulse voltage between said medium and said probe electrode, thereby recording an information by imparting a perturbation to a surface of said medium by selectively generating disturbance; and

applying a bias voltage between said medium and said probe electrode to read the information of said medium.

30. An information processing method according to claim 29, further comprising the steps of:

providing said information recording medium on which said information has been recorded beforehand;

arranging a probe electrode in close proximity to said medium; and

applying a bias voltage between said medium and said probe electrode so as to read the information from said medium.

32. An information processing method according to claim 29, wherein said substrate comprises a noble metal electrode thin film made of said planar crystal having a plane orientation dispersion angle measuring 1°

or less by X-ray analysis.