LOW-NOISE OPERATION OF INTEGRATED YBA2CU3O7 MAGNETOMETERS IN STATIC MAGNETIC-FIELDS

The noise of two integrated YBa2Cu3O7-SrTiO3-YBa2Cu3O7 multilayer magn etometers in static magnetic fields up to 110 mu T is investigated: An inductively coupled magnetometer with integrated flux transformer and a multiloop magnetometer. In both samples; only a moderate increase o f the low frequency flux noise is found in high fields, due to the hig h epitaxial quality of the involved multilayer films. So for moderatel y shielded or unshielded applications in the earth's magnetic field, h igh-quality integrated YBa2Cu3O7 magnetometers can be operated with lo w excess noise. (C) 1998 American Institute of Physics.