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Evaluates picovoltmeters based on a high transition temperature direct current superconducting quantum interference device (SQUID). Connection of the voltage source to a calibrated resistor and a coil coupled to a SQUID; Components of the coil; Determination of the lowest voltage noise achieved.

Investigates the noise performance of YBa[sub 2]Cu[sub 3]O[sub 7-x] direct current superconducting quantum interference devices (SQUID). Absence of effect in the white noise of the devices at 77 Kelvin; Increase in the magnitude of the spectral density of the 1/f noise; Impact of the increase in noise on SQUID operated in the field of the earth.

Details the fabrication of direct current (dc) superconducting quantum interference device (SQUID) magnetometers with single film YBa[sub 2]Cu[sub 3]O[sub 7-x] flux transformers. Attachment of the transformer to a loop directly coupled to a dc SQUID; Values of the lowest magnetic field noise achieved; Applications of the device.

Fabricates the direct current superconducting quantum interference device (SQUID) magnetometers from YBa[sub 2]Cu[sub 3]O[sub 7-x] thin films. Use of flux modulation to measure the magnetometer noise; Relationship between magnetic field sensitivity and hole size; Effect of reducing SQUID inductance on magnetic field resolution.

Evaluates magnetic microscopy through liquid nitrogen cooled YBa[sub 2]Cu[sub 3]O[sub 7] superconducting quantum interference device. Production of two-dimensional images of magnetic fields; Development of magnetic flux microscope; Presentation of magnetic images.