Magnesium diboride superconducting quantum interference devices fabricated by focused ion beam

Author

Burnell, Gavin ; Tarte, Edward J. ; Yates, Karen A. ; Kang, Dae-Joon ; Ansell, David A. ; Moon, S.H. ; Lee, H.N. ; Oh, B. ; Blamire, Mark G.

Author_Institution

Dept. of Mater. Sci., Univ. of Cambridge, UK

Volume

13

Issue

2

fYear

2003

fDate

6/1/2003 12:00:00 AM

Firstpage

869

Lastpage

872

Abstract

We have recently developed a technique for fabricating Superconductor-Normal-Superconductor (SNS) junctions in MgB₂ thin films using a focused ion beam (FIB). These junctions show a strong modulation of the critical current by applied magnetic field and microwaves. We have made Superconducting Quantum Interference Devices (SQUIDs) with directly coupled pick-up loops using this technique which show large voltage modulations (∼200 μV at 6 K) and a white noise level of 15 μΦ₀Hz^-12/ at 5 kHz. In this work we present the latest results from our devices. We are studying the nature of the barrier created by our fabrication process and also report a preliminary Raman scattering and transport measurement study of resistors made with this technique.

Keywords

SQUIDs; focused ion beam technology; high-temperature superconductors; magnesium compounds; superconducting thin films; superconductor-normal-superconductor devices; 5 kHz; 6 K; MgB₂; MgB₂ thin film; Raman scattering; SNS junction; SQUID; barrier formation; critical current; directly coupled pick-up loop; focused ion beam technology; magnetic field; microwave irradiation; resistor; transport properties; voltage modulation; white noise; Critical current; Interference; Ion beams; Josephson junctions; Magnesium compounds; Magnetic modulators; SQUIDs; Superconducting devices; Superconducting microwave devices; Superconducting thin films;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2003.814071

Filename

1211742