WO2003048797A1 - Squid-mikroskop für raumtemperaturproben - Google Patents
Squid-mikroskop für raumtemperaturproben Download PDFInfo
- Publication number
- WO2003048797A1 WO2003048797A1 PCT/DE2002/004245 DE0204245W WO03048797A1 WO 2003048797 A1 WO2003048797 A1 WO 2003048797A1 DE 0204245 W DE0204245 W DE 0204245W WO 03048797 A1 WO03048797 A1 WO 03048797A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- component according
- squid
- substrate
- conductor track
- edge
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/035—Measuring direction or magnitude of magnetic fields or magnetic flux using superconductive devices
- G01R33/0354—SQUIDS
- G01R33/0358—SQUIDS coupling the flux to the SQUID
Definitions
- the invention relates to a component for a SQUID microscope and the same.
- a SQUID microscope is commercially available. It includes a superconducting quantum interference detector (SQUID), with which magnetic fields are detected in a highly sensitive manner.
- the SQUIDS measurement signal represents the quantity that is observed and evaluated using the microscope.
- a SQUID must be operated at low temperatures, which are typically 77K.
- the closed conductor track consists of superconducting material. Yttrium barium copper oxide is typically used.
- the SQUID element is also made of superconducting material.
- the tip of a SQUID microscope is formed by a closed, superconducting conductor track. In the end, this is up to 1 50 ⁇ m thick.
- the closed conductor track is used to transfer the magnetic field to the SQUID.
- the diameter of a SQUID is typically 1.5 mm. A SQUID can therefore not be used as a tip.
- a SQUID comprises a closed conductor track with a Josephson contact.
- An rf-SQUID in particular an rf-SQUID gradiometer, is preferred for a microscope.
- An rf-SQUID gradiometer consists of two closed conductor tracks with a Josephson Contact. This is particularly sensitive. In principle, however, any type of SQUID can be used, including a DC SQUID.
- the closed conductor track which was first used as a tip, is used to transmit magnetic flux to the SQUID.
- a tank circuit is provided for an rf-SQUID in order to measure changes in the closed conductor path of the SQUID. These changes cause changes in the voltage in the tank circuit.
- the voltage change mentioned is a measure of the measured magnetic field ,
- the distance between the sample and the tip of the microscope must be small in order to obtain good measurement results.
- the problem then is that the tip of the microscope must be exposed to a temperature of 77 ° C or lower, whereas the sample is at room temperature.
- the tip of the microscope is in a vacuum chamber.
- a window of the vacuum chamber has a groove, groove or recess.
- the window is particularly thin due to the groove, groove or recess. Since the groove, groove or recess is very small, the thin area is not affected by the vacuum inside the Chamber destroyed.
- the window is typically 100 to 500 ⁇ m thick. At the bottom of the groove, groove or recess, the thickness of the window typically drops to 4 to 5 ⁇ m.
- the width of the groove, groove or recess is typically 500 ⁇ m in the prior art. However, smaller widths can also be realized by the invention.
- the closed conductor track which is used to transmit magnetic flux to the SQUID, should be brought as close as possible to the thin part of the window so that the distance between the sample and the tip of the microscope can be kept small.
- the distance is at least 50 ⁇ m.
- the prerequisite for this is the use of a DC-SQUID, since it is relatively small.
- the object of the invention is to provide a SQUID microscope in which a very small distance between the sample and the microscope tip is possible.
- the tip of the microscope is understood to mean the area of a closed, superconducting conductor track that comes closest to the sample.
- This closed conductor track is used to transmit the magnetic flux to the SQUID.
- the object is achieved in that a substrate is provided which has an edge.
- the closed conductor track, which couples the sample to the SQUID or serves to transmit the magnetic flux, is guided over the edge.
- the two sides of the substrate adjoining the edge enclose an angle which is between 90 and 180 °. By providing the angle, it is possible to bring the substrate together with the closed conductor track closer to the window than is possible in the prior art.
- the figures illustrate the connection.
- a so-called "weak link” arises within the closed conductor path as soon as the conductor path passes the edge. This "weak link” is not wanted. Adverse effects of the "weak left” can, however, be avoided. If, for example, the width of the closed conductor track is chosen to be wide enough, there are no problems due to a Josephson contact. The critical current is then high enough so that the operating temperatures are the same Influences of the "weak link” can be neglected.
- the conductor track should be at least 5 ⁇ m wide.
- the edge is rounded off in order to minimize the effects of a “weak link”.
- the distance between a sample and the adjacent closed conductor track can be reduced to up to 10 ⁇ m.
- An rf-SQUID gradiometer is problematic because it requires a relatively large amount of space. This includes other elements, such as. B. a tank circuit.
- the invention therefore not only succeeds in reducing the distance between the sample and the microscope tip in comparison to the prior art, but at the same time there is sufficient space available to be able to use more sensitive SQUIDs, which, however, require more space.
- a plurality of SQUID elements with a plurality of microscope tips, which are formed by closed conductor tracks, in order to be able to carry out gradiometric measurements in this way.
- a high resolution can also be achieved with this.
- Complicated structures e.g. B. include a labyrinth resonator for forwarding the magnetic flux to the SQUID element are also possible. In this way, higher sensitivities can also be achieved compared to the prior art.
- the closed conductor track additionally has a tip made of paramagnetic material at the end, which serves to absorb the magnetic flux. This can further improve the spatial resolution.
- the part of the closed conductor track that acts as the tip of the microscope can only be 5 ⁇ m wide. This enables very large spatial resolutions.
- the closed conductor track is typically 5 ⁇ m wide. However, the width is not critical. It should only be borne in mind that as the width of the conductor tracks increases, the tip that serves to absorb the river also widens. This reduces the spatial resolution.
- the diameter at the point of the closed conductor path at which the flow is recorded typically varies from 5 ⁇ m to 1 50 ⁇ m. Depending on the application, the diameter of the closed conductor track is selected appropriately.
- FIG. 1 shows a substrate 1 with an edge 2 and a closed conductor track made of superconducting material, which is guided over the edge 2.
- the part-circular area 4 of the closed conductor track serves as a tip in a SQUID microscope.
- a SQUID which is not shown here, adjoins the partially circular region 5 of the closed conductor track.
- Figure 2 shows a window 7 which is part of a vacuum chamber.
- the window 7 has a recess 8 into which the substrate 1 extends.
- the microscope according to the invention has features that are already known from the prior art.
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Measuring Magnetic Variables (AREA)
- Superconductor Devices And Manufacturing Methods Thereof (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02787372A EP1449001A1 (de) | 2001-11-27 | 2002-11-19 | Squid-mikroskop für raumtemperaturproben |
US10/496,777 US20050116719A1 (en) | 2001-11-27 | 2002-11-19 | Squid microscope for room temperature samples |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10158096A DE10158096B4 (de) | 2001-11-27 | 2001-11-27 | Bauteil für ein SQUID-Mikroskop für Raumtemperaturproben sowie zugehörige Verwendung |
DE10158096.7 | 2001-11-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003048797A1 true WO2003048797A1 (de) | 2003-06-12 |
Family
ID=7707090
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2002/004245 WO2003048797A1 (de) | 2001-11-27 | 2002-11-19 | Squid-mikroskop für raumtemperaturproben |
Country Status (4)
Country | Link |
---|---|
US (1) | US20050116719A1 (de) |
EP (1) | EP1449001A1 (de) |
DE (1) | DE10158096B4 (de) |
WO (1) | WO2003048797A1 (de) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07110366A (ja) * | 1993-10-12 | 1995-04-25 | Sumitomo Electric Ind Ltd | 磁気顕微鏡 |
US5600243A (en) * | 1993-09-07 | 1997-02-04 | Conductus, Inc. | Magnetically shielded magnetic sensor with squid and ground plane |
US5894220A (en) * | 1996-02-12 | 1999-04-13 | University Of Maryland | Apparatus for microscopic imaging of electrical and magnetic properties of room-temperature objects |
US6118284A (en) * | 1996-10-04 | 2000-09-12 | Ghoshal; Uttam S. | High speed magnetic flux sampling |
US6175749B1 (en) * | 1998-06-22 | 2001-01-16 | Forschungszentrum Julich Gmbh | Assembly of carrier and superconductive film |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3247543A1 (de) * | 1982-12-22 | 1984-06-28 | Siemens AG, 1000 Berlin und 8000 München | Vorrichtung zur mehrkanaligen messung schwacher, sich aendernder magnetfelder und verfahren zu ihrer herstellung |
DE3735668A1 (de) * | 1987-10-22 | 1989-05-03 | Philips Patentverwaltung | Vorrichtung zur mehrkanaligen messung schwacher magnetfelder |
US5134117A (en) * | 1991-01-22 | 1992-07-28 | Biomagnetic Technologies, Inc. | High tc microbridge superconductor device utilizing stepped edge-to-edge sns junction |
US5523686A (en) * | 1994-08-30 | 1996-06-04 | International Business Machines Corporation | Probes for scanning SQUID magnetometers |
DE19519480C2 (de) * | 1995-05-27 | 2000-02-03 | Forschungszentrum Juelich Gmbh | Magnetflußsensor mit hoher Ortsauflösung |
JP3133013B2 (ja) * | 1997-03-31 | 2001-02-05 | セイコーインスツルメンツ株式会社 | 超伝導量子干渉素子およびそれを用いた非破壊検査装置 |
US6154026A (en) * | 1997-04-30 | 2000-11-28 | The Regents Of The University Of California | Asymmetric planar gradiometer for rejection of uniform ambient magnetic noise |
-
2001
- 2001-11-27 DE DE10158096A patent/DE10158096B4/de not_active Withdrawn - After Issue
-
2002
- 2002-11-19 WO PCT/DE2002/004245 patent/WO2003048797A1/de not_active Application Discontinuation
- 2002-11-19 US US10/496,777 patent/US20050116719A1/en not_active Abandoned
- 2002-11-19 EP EP02787372A patent/EP1449001A1/de not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5600243A (en) * | 1993-09-07 | 1997-02-04 | Conductus, Inc. | Magnetically shielded magnetic sensor with squid and ground plane |
JPH07110366A (ja) * | 1993-10-12 | 1995-04-25 | Sumitomo Electric Ind Ltd | 磁気顕微鏡 |
US5894220A (en) * | 1996-02-12 | 1999-04-13 | University Of Maryland | Apparatus for microscopic imaging of electrical and magnetic properties of room-temperature objects |
US6118284A (en) * | 1996-10-04 | 2000-09-12 | Ghoshal; Uttam S. | High speed magnetic flux sampling |
US6175749B1 (en) * | 1998-06-22 | 2001-01-16 | Forschungszentrum Julich Gmbh | Assembly of carrier and superconductive film |
Non-Patent Citations (1)
Title |
---|
LEE T S ET AL: "High-T/sub c/ SQUID microscope for room temperature samples", 1996 APPLIED SUPERCONDUCTIVITY CONFERENCE, PITTSBURGH, PA, USA, 25-30 AUG. 1996, vol. 7, no. 2, pt.3, IEEE Transactions on Applied Superconductivity, June 1997, IEEE, USA, pages 3147 - 3150, XP002238926, ISSN: 1051-8223 * |
Also Published As
Publication number | Publication date |
---|---|
US20050116719A1 (en) | 2005-06-02 |
EP1449001A1 (de) | 2004-08-25 |
DE10158096A1 (de) | 2003-06-05 |
DE10158096B4 (de) | 2006-01-12 |
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