NdBa2Cu3O7-δ superconducting thin films were grown on SrΤiO 3 (100) and LaSrGaO 4 (100) substrates by off-axis rf sputtering and pulsed laser deposition. The effects of several deposition parameters, e.g. gas pressure, substrate temperature and energy density were studied. Thin films grown by off-axis rf sputtering were highly c-axis oriented, but those by pulsed laser deposition were predominantly a-axis oriented under our deposition conditions. However, the c-axis oriented portion for the films grown by pulsed 1aser deposition was increased by increasing the temperature above 800°C.T c ( z e r o )w a s 8 7 K a n d 8 3 K f o r t h ec -a n d a -a x i s o r i e n t e d f i l m s r e s p e c t i v e l y . The critical current density of c-axis oriented films was 10 6 -10 7 A/cm2 below 60 K.
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PACS 85.25.Dq YBCO dc SQUID magnetometers based on bicrystal Josephson junctions on 10 mm × 10 mm STO substrates have been fabricated. We have designed three different types of pickup coils for the SQUID magnetometers, i.e., solid-type, 12 and 16 parallel loops with 50 µm line width to test performances of the SQUIDs for use in a magnetically disturbed environment. Magnetometer with 16-parallel-loop pickup coil exhibit most stable FLL operation under external dc magnetic field. Finally, we could obtain optimised direct coupled YBCO SQUID magnetometer design having flux transfer coefficient B Φ of 4.5 nT/Φ 0 and magnetic field noise B N of 30 fT/Hz 1/2 measured at 100 Hz.
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