EP0567386A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Planar magnetism sensor utilizing a squid of oxide superconductor
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1993-04-20
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Granted: —
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Expires: 2013-04-20
Abstract
Abstract A magnetism sensor comprises a substrate, a SQUID including a washer of an oxide superconductor thin film formed on a principal surface of the substrate, a hole shaped a similar figure to the washer at the center of the washer, a slit formed between one side of the washer and the hole and a Josephson junction by which portions of the washer at the both sides of the slit are connected across the slit. The magnetism sensor further comprises a superconducting flux transformer of an oxide superconductor thin film including an input coil arranged on the SQUID but isolated from the SQUID and a pickup coil arranged on the principal surface of the substrate far from the SQUID, which are connected in parallel and a magnetism shield which excludes flux penetrating into the Josephson junction of the SQUID. <IMAGE>
Inventors
- 👤 Takashi C/O Itami Works Matsuura
- 👤 Hideo C/O Itami Works Itozaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 01:57
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/02; G01R33/035; G01R33/0354; G01R33/0358; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/842; Y10S505/843; Y10S505/845; Y10S505/846
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
138 words
A magnetism sensor comprising a substrate, a SQUID including a washer of an oxide superconductor thin film formed on a principal surface of the substrate, a hole shaped a similar figure to the washer at the center of the washer, a slit formed between one side of the washer and the hole and a Josephson junction by which portions of the washer at the both sides of the slit are connected across the slit, the magnetism sensor further comprising a superconducting flux transformer of an oxide superconductor thin film including an input coil arranged on the SQUID but isolated from the SQUID and a pickup coil arranged on the principal surface of the substrate far from the SQUID, which are connected in parallel and a magnetism shield which excludes flux penetrating into the Josephson junction of the SQUID.
Claim 2
Dependent Claim
138 words
A magnetism sensor comprising a substrate, a SQUID including a washer of an oxide superconductor thin film formed on a principal surface of the substrate, a hole shaped a similar figure to the washer at the center of the washer, a slit formed between one side of the washer and the hole and a Josephson junction by which portions of the washer at the both sides of the slit are connected across the slit, the magnetism sensor further comprising a superconducting flux transformer of an oxide superconductor thin film including an input coil arranged on the SQUID but isolated from the SQUID and a pickup coil arranged on the principal surface of the substrate far from the SQUID, which are connected in parallel and a magnetism shield which excludes flux penetrating into the Josephson junction of the SQUID.
Claim 3
Dependent Claim
19 words
A magnetism sensor claimed in Claim 1 wherein the magnetism shield is formed of an oxide superconductor thin film.
Claim 4
Dependent Claim
20 words
A magnetism sensor claimed in Claims 1 or 2 wherein the washer and the hole of the SQUID are rectangular.
Claim 5
Dependent Claim
22 words
A magnetism sensor claimed in Claim 3 wherein the input coil and the pickup coil of the superconducting flux transformer are rectangular.
Claim 6
Dependent Claim
29 words
A magnetism sensor claimed in any one of Claim 1 to 4 wherein the Josephson junction of the SQUID is constituted of a grain boundary of the oxide superconductor.
Claim 7
Dependent Claim
26 words
A magnetism sensor claimed in any one of Claim 1 to 5 wherein the SQUID includes two Josephson junctions so as to constitute a DC- SQUID.
Claim 8
Dependent Claim
40 words
A magnetism sensor claimed in any one of Claim 1 to 6 wherein the oxide superconductor thin films are formed of a high-T c (high critical temperature) oxide superconductor, particularly, formed of a high-T c copper-oxide type compound oxide superconductor..
Claim 9
Dependent Claim
48 words
A magnetism sensor claimed in Claim 7 wherein the oxide superconductor thin films are formed of an oxide superconductor material selected from the group consisting of a Y-Ba-Cu-O type compound oxide superconductor material, a Bi-Sr-Ca-Cu-O type compound oxide superconductor material, and a TI-Ba-Ca-Cu-O type compound oxide superconductor material.
Claim 10
Dependent Claim
42 words
A magnetism sensor claimed in any one of Claim 1 to 8 wherein the substrate is formed of a material selected from the group consisting of a MgO (100) substrate, a SrTi0 3 (100) substrate and an yttrium stabilized zirconia (YSZ) substrate.
Claim 11
Dependent Claim
177 words
A magnetism sensor comprising a substrate having a rectangular parallelpipedic concavity on a surface, a SQUID including a square washer having two tongue portions of an oxide superconductor thin film formed on the surface of the substrate, a square hole at the center of the washer, a slit formed between the tongue portions to the hole, and a member of an oxide superconductor thin film including two Josephson junctions connected in series, which connects the two tongue portions across the slit, the magnetic sensorfurther including a superconducting flux transformer of an oxide superconductor thin film including a rectangular input coil arranged on the SQUID but isolated from the SQUID and a rectangular pickup coil arranged on the principal surface of the substrate far from the SQUID, which are connected in parallel and a magnetism shield which excludes flux penetrating into the Josephson junctions of the SQUID in which the Josephson junctions of the SQUID are constituted of grain boundaries of the oxide superconductor at steps between the surface of the substrate and the bottom of the concavity.
Claim 12
Dependent Claim
177 words
A magnetism sensor comprising a substrate having a rectangular parallelpipedic concavity on a surface, a SQUID including a square washer having two tongue portions of an oxide superconductor thin film formed on the surface of the substrate, a square hole at the center of the washer, a slit formed between the tongue portions to the hole, and a member of an oxide superconductor thin film including two Josephson junctions connected in series, which connects the two tongue portions across the slit, the magnetic sensorfurther including a superconducting flux transformer of an oxide superconductor thin film including a rectangular input coil arranged on the SQUID but isolated from the SQUID and a rectangular pickup coil arranged on the principal surface of the substrate far from the SQUID, which are connected in parallel and a magnetism shield which excludes flux penetrating into the Josephson junctions of the SQUID in which the Josephson junctions of the SQUID are constituted of grain boundaries of the oxide superconductor at steps between the surface of the substrate and the bottom of the concavity.
References Cited (Backward Citations)
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