Arrangement for coupling an RF-squid magnetometer to a superconductive tank circuit

• US 6,225,800 B1
• Filed: 09/25/1998
• Issued: 05/01/2001
• Est. Priority Date: 03/26/1996
• Status: Expired due to Fees

• Current Assignee: Forschungszentrum Jã¼Lich GmbH (Bundesrepublik Deutschland)
• Original Assignee: Forschungszentrum Jã¼Lich GmbH (Bundesrepublik Deutschland)
• Inventors: Schubert, Jurgen, Banzet, Marko, Zhang, Yi, Soltner, Helmut, Zander, Willi
• Primary Examiner(s): Snow, Walter E.
• Application Number:
  US09/155,342
• Time in Patent Office: 949 Days
• Field of Search: 324/248, 257/31, 257/32, 257/34, 257/661, 257/663, 327/510, 327/527, 505/845, 505/846, 505/876
• US Class Current: 324/248
• CPC Class Codes: G01R 33/0358 coupling the flux to the SQUID gradiometer coils G01R33/022; coils with superconductive winding H01F6/06
• CPC Class Codes: Y10S 505/846 using superconductive quantum interference device, i.e. squid

Abstract

An arrangement for coupling an rf-SQUID magnetometer to a superconductive tank circuit on a substrate is constructed in such a way that the two components are fully integrated into each other. Such integration increases the quality of the tank circuit by a factor of 2 to 3 as opposed to an arrangement obtainable by the flip-chip technology. Furthermore, the integrated arrangement permits simple assessment of coupling “k” between the SQUID and the tank circuit.

Claims

1. An arrangement for coupling an rf-SQUID magnetometer to a superconductive tank circuit (1) comprising:

a tank circuit having a circuit coil and a laminar capacitive structure which enclose the rf-SQUID magnetometer, said tank circuit consisting of superconductive thin-layer material; and

an rf-SQUID magnetometer (2) containing an rf-SQUID with a washer and a multiloop structures;

wherein the tank circuit (1) and the rf-SQUID magnetometer (2) are arranged planar to each other on the same substrate.

2. The arrangement of claim 1, characterized in that the rf-SQUID magnetometer (2) contains an rf-SQUID with a current-injection structure (6).

3. The arrangement of claim 1, characterized in that the rf-SQUID magnetometer (2) contains an rf-SQUID with a single-layered or multi-layered, multi-winding transformer structure (7).

4. The arrangement of claim 1, characterized in that the rf-SQUID magnetometer (2) has an rf-SQUID with a double hole gradiometer structure having opposing coils (9).

5. The arrangement of claim 1, characterized in that the circuit (1) has a minimum resonance frequency of 400 Mhz and a minimum quality of 1000.

6. The arrangement of claim 1, characterized in that the rf-SQUID magnetometer (2) is coupled to a base plate (10).

7. The arrangement of claim 6, characterized in that the circuit coil (1a) is formed as an inner loop which encloses the rf-SQUID magnetometer (2) and has a slot (4).

8. The arrangement of claim 6, characterized in that the base plate (10) is formed as an outer loop (10a) coplanar to the rf-SQUID magnetometer (2) and the tank circuit (1) and having a slot (11).

9. The arrangement of claim 8, characterized in that the orientation of the slots (4;

11) of the inner loop (1a) and the outer loop (11) relative to each other determines the resonance frequency f_r.

10. The arrangement of claim 9, characterized in that an adjustment of the slots (4;

11) effects a change in the resonance frequency f_r of <

=300 Mhz.