US4016062A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming a serrated surface topography
Assignee: International Business Machines Corp
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Filing: 1975-09-11
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Granted: 1977-04-05
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Expires: 1995-09-11
Abstract
Abstract A method of forming a serrated surface topography useful for the unidirectional propagation of magnetic domains is disclosed. The method includes the step of forming a substantially rectangular wave topograhy on the surface of the structure and subsequently ion milling the rectangular wave topography at an oblique angle of incidence to form the serrated surface topography.
Inventors
- 👤 Rajendra Rangraj Mehta
- 👤 Otto Voegeli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:19
CPC Classifications
C; C23; C23F; C23F4/00; G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0808; G11C19/0825; H; H01; H01J; H01J37/00; H01J37/30; H01J37/305; H01J37/3053; H01J37/3056; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/2457
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
41 words
A method of forming a serrated surface topography comprising the steps of forming a structure having a substantially rectangular wave surface topography, ion milling said rectangular wave surface topography at an oblique angle of incidence to form a serrated surface topography.
Claim 2
Independent Claim
41 words
A method of forming a serrated surface topography comprising the steps of forming a structure having a substantially rectangular wave surface topography, ion milling said rectangular wave surface topography at an oblique angle of incidence to form a serrated surface topography.
Claim 3
Dependent Claim
26 words
A method as described in claim 1 whereby the angle of incidence formed with the perpendicular to the surface topography is about 50° to 75° .
Claim 4
Dependent Claim
16 words
A method as described in claim 2 whereby the angle of incidence is about 60° .
Claim 5
Dependent Claim
19 words
A method as described in claim 1 whereby the rectangular wave surface topography is formed by etching the surface.
Claim 6
Dependent Claim
20 words
A method as described in claim 1 whereby the rectangular wave surface topography is formed by ion milling the surface.
Claim 7
Dependent Claim
21 words
A method as described in claim 1 whereby the rectangular wave surface topography is formed by depositing material on the surface.
Claim 8
Dependent Claim
13 words
A method as described in claim 1 whereby a single slope is formed.
Claim 9
Independent Claim
60 words
A method of forming a serrated surface topography having a larger backward slope and a smaller forward slope comprising the steps of forming a structure having a substantially rectangular wave surface topography, ion milling said rectangular wave surface topography at an oblique angle of incidence to form a serrated surface topography having a backward slope of 90° to 45° .
Claim 10
Independent Claim
60 words
A method of forming a serrated surface topography having a larger backward slope and a smaller forward slope comprising the steps of forming a structure having a substantially rectangular wave surface topography, ion milling said rectangular wave surface topography at an oblique angle of incidence to form a serrated surface topography having a backward slope of 90° to 45° .
Claim 11
Dependent Claim
24 words
A method as described in claim 8 whereby the ion milling step is performed to yield a forward slope of 5° to 45° .
References Cited (Backward Citations)
US3860783A
Cited
US3904462A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-04 | 1980-10-04 | 1981-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-04 | 1984-10-04 | 1985-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-04 | 1988-10-04 | 1989-04-05 | $7700.00 | Window Closed / Lapsed |