Title :
Integrated YBa/sub 2/Cu/sub 3/O/sub 7/ multi-loop magnetometers at 77 K
Author :
Reimer, D. ; Schilling, M. ; Knappe, S. ; Drung, D.
Author_Institution :
Inst. fur Angewandte Phys., Hamburg Univ., Germany
fDate :
6/1/1995 12:00:00 AM
Abstract :
We present a multi-loop DC SQUID magnetometer operated at 77 K. In a multi-layer process YBa/sub 2/Cu/sub 3/O/sub 7/, PrBa/sub 2/Cu/sub 3/O/sub 7/, and SrTiO/sub 3/ films are deposited by KrF-excimer laser deposition on SrTiO/sub 3/(100) substrates. The preparation consists of four film deposition and three patterning steps. We employ YBa/sub 2/Cu/sub 3/O/sub 7/ Josephson junctions with artificial barriers of PrBa/sub 2/Cu/sub 3/O/sub 7/ in a ramp-type geometry. The characterization is made by electrical transport and by noise measurements. The measured magnetic field sensitivity of 1.25 nT//spl Phi//sub 0/ of our device fits well with the calculated value of 1.17 nT//spl Phi//sub 0/.<>
Keywords :
Josephson effect; SQUID magnetometers; barium compounds; high-temperature superconductors; laser deposition; superconducting device noise; superconducting device testing; yttrium compounds; 77 K; KrF excimer laser deposition; SrTiO/sub 3/; SrTiO/sub 3/ [100] substrates; YBCO Josephson junctions; YBa/sub 2/Cu/sub 3/O/sub 7/-PrBa/sub 2/Cu/sub 3/O/sub 7/-SrTiO/sub 3/; characterization; electrical transport measurements; film deposition; magnetic field sensitivity; multilayer process; multiloop DC SQUID magnetometer; noise measurements; patterning; ramp-type geometry; Critical current; Inductance; Insulation; Josephson junctions; Magnetic field measurement; Magnetic films; Magnetometers; Optical films; Substrates; Superconducting coils;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
