Search

Examines YBa[sub 2]Cu[sub 3]O[sub 7-x] thin film magnetometer. Use of photolithographic processing to pattern layers; Operation of the magnetometer; Determination of the flux transformer critical current; Measurement of the device magnetic field sensitivity.

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.

Examines the production of magnetic images of eddy currents in patterned copper thin films using a scanning magnetic flux microscope. Use of weak applied fields in small structure imaging; Application of the superconducting quantum interference device in the image production; Induction of eddy currents in the samples.

Describes the fabrication and testing of an integrated thin-film magnetometer with two superconducting layers. Use of superconducting quantum interference device as flux transformer crossunder; Sequence of deposition and photolithographic patterning of the layers; Measurement of magnetic flux and field noise; Use of x-ray diffraction technique.

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.