Planar SQUID gradiometers fabricated on 24/spl deg/ and 30/spl deg/ SrTiO/sub 3/ bicrystals

Author

Carr, C. ; Eulenburg, A. ; Romans, E. ; Pegrum, C.M. ; Donaldson, G.B.

Author_Institution

Dept. of Phys. & Appl. Phys., Strathclyde Univ., Glasgow, UK

Volume

9

Issue

2

fYear

1999

fDate

6/1/1999 12:00:00 AM

Firstpage

3105

Lastpage

3108

Abstract

HTS dc SQUID gradiometers have been fabricated on 24/spl deg/ and 30/spl deg/ SrTiO/sub 3/ bicrystal substrates with slots and flux dams in the SQUID washers. The spatial response of such devices has been measured experimentally and compared with modelled results. Single layer devices, in terms of gradient sensitivity, have characteristics that deviate only slightly from idealized first order gradiometers. The low frequency flux noise of these devices is discussed with particular emphasis on both the unshielded properties and the effect of various cooldown procedures on the noise.

Keywords

SQUID magnetometers; bicrystals; high-temperature superconductors; strontium compounds; superconducting device noise; SrTiO/sub 3/; SrTiO/sub 3/ bicrystal substrate; cooldown; flux dam; gradient sensitivity; high temperature superconductor; low frequency flux noise; planar DC SQUID gradiometer; single layer device; slot; spatial response; washer; Frequency; Geometry; High temperature superconductors; Low-frequency noise; Physics; SQUIDs; Solids; Superconducting device noise; Temperature sensors; Working environment noise;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.783686

Filename

783686