US3820092A
Expired / Lapsed
US
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Magnetic domain detector arrangement
Assignee: AT&T Inc
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Filing: 1973-01-22
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Granted: 1974-06-25
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Expires: 1993-01-22
Abstract
Abstract An enhanced output signal is provided by the coupling of a magnetic bubble to a magnetoresistance detector element when the familiar rotating in-plane drive field is set at an amplitude such that the presence of a bubble results in a change in frequency in signal exhibited by the detector element due to the in-plane field. The largest signals yet achieved resulted from an integrated expansion detector, guard rail arrangement with a meandering magnetoresistance element when operated in this manner.
Inventors
- 👤 A Bobeck
- 👤 F Ciak
- 👤 W Strauss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:16
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/02; G01R33/06; G01R33/09; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0866
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
159 words
Magnetic apparatus comprising a layer of material in which single wall domains can be moved along a multistage path including a detector stage in response to a magnetic field having a first amplitude below a critical value and reorienting in the plane of said layer at said frequency f1, a magnetic detector element coupled to said layer at said detector stage in a manner to exhibit a periodic output signal of frequency f1 in the absence of a domain there and having a geometry to exhibit a periodic output signal of frequency f2 2f1 in the presence of a domain for a reorienting field with an amplitude of less than said critical value thereby periodically defining a time T1 during said output signal when said signal of frequency f1 is a first polarity and said signal of frequency f2 is of a second polarity in response to the absence and presence of a domain in said detector stage respectively.
Claim 2
Dependent Claim
159 words
Magnetic apparatus comprising a layer of material in which single wall domains can be moved along a multistage path including a detector stage in response to a magnetic field having a first amplitude below a critical value and reorienting in the plane of said layer at said frequency f1, a magnetic detector element coupled to said layer at said detector stage in a manner to exhibit a periodic output signal of frequency f1 in the absence of a domain there and having a geometry to exhibit a periodic output signal of frequency f2 2f1 in the presence of a domain for a reorienting field with an amplitude of less than said critical value thereby periodically defining a time T1 during said output signal when said signal of frequency f1 is a first polarity and said signal of frequency f2 is of a second polarity in response to the absence and presence of a domain in said detector stage respectively.
Claim 3
Dependent Claim
16 words
Apparatus in accordance with claim 1 also including means for strobing said detector at times T1.
Claim 4
Dependent Claim
21 words
Apparatus in accordance with claim 2, including a pattern of magnetically soft elements for defining said path including said detector stage.
Claim 5
Dependent Claim
32 words
Apparatus in accordance with claim 3 wherein said pattern of elements comprises a succession of stages including said detector stage having increasingly larger numbers of elements for expanding a domain moved therealong.
Claim 6
Dependent Claim
21 words
Apparatus in accordance with claim 4 wherein the elements of said succession of stages comprises a fine-grained pattern of chevron-shaped elements.
Claim 7
Dependent Claim
34 words
Apparatus in accordance with claim 5 wherein said magnetic detector element comprises at least portions of the elements in said detection stage and interconnecting sections between said elements in said detection stage in pairs.
Claim 8
Dependent Claim
22 words
Apparatus in accordance with claim 6 wherein said interconnecting sections interconnect the ends of adjacent elements in said detection stage in pairs.
Claim 9
Dependent Claim
28 words
Apparatus in accordance with claim 7 wherein said output signals have a period P and said strobe pulse has a duration of only a small fraction of P.
Claim 10
Dependent Claim
18 words
Apparatus in accordance with claim 8 wherein said strobe pulse has a duration of from (P/10) to (P/20).
Claim 11
Dependent Claim
136 words
Magnetic apparatus comprising a layer of material in which single wall domains can be moved along a multistage path including a detector stage in response to a magnetic field having a first amplitude below a critical value and reorienting in the plane of said layer at a frequency f1, a magnetic detector element coupled to said layer at said detector stage in a manner to exhibit a periodic output signal of a frequEncy f1 and of a frequency f2 2f1 for values of said first amplitude below and above said critical value respectively, means for providing said reorienting field of said first amplitude at a value sufficiently below said critical value so that said output signal is of frequency f1 in the absence of a domain and of frequency f2 in the presence of a domain.
Claim 12
Dependent Claim
136 words
Magnetic apparatus comprising a layer of material in which single wall domains can be moved along a multistage path including a detector stage in response to a magnetic field having a first amplitude below a critical value and reorienting in the plane of said layer at a frequency f1, a magnetic detector element coupled to said layer at said detector stage in a manner to exhibit a periodic output signal of a frequEncy f1 and of a frequency f2 2f1 for values of said first amplitude below and above said critical value respectively, means for providing said reorienting field of said first amplitude at a value sufficiently below said critical value so that said output signal is of frequency f1 in the absence of a domain and of frequency f2 in the presence of a domain.
Claim 13
Dependent Claim
111 words
Apparatus comprising a layer of material in which single wall domains can be moved along a path including a detector stage in response to a magnetic field having a first amplitude and rotating in the plane of said layer at a first frequency, means coupled to said layer at said detector stage for detecting the presence and absence of a domain, said last-mentioned means having a geometry for exhibiting an output signal of said first frequency and of a second frequency different from said first frequency in response to the absence and presence of a domain in said detector stage respectively in combination with means for detecting said change in frequency.
Claim 14
Dependent Claim
111 words
Apparatus comprising a layer of material in which single wall domains can be moved along a path including a detector stage in response to a magnetic field having a first amplitude and rotating in the plane of said layer at a first frequency, means coupled to said layer at said detector stage for detecting the presence and absence of a domain, said last-mentioned means having a geometry for exhibiting an output signal of said first frequency and of a second frequency different from said first frequency in response to the absence and presence of a domain in said detector stage respectively in combination with means for detecting said change in frequency.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |