Magnetic Mapping of Current Distributions in Two-Dimensional Electronic Devices

摘要

The 4-channel, high-resolution SQUID magnetometer system has been ordered. This system will have a spatial resolution of approximately 1 mm. The motors for the three-axis, non-magnetic positioning system have been obtained after lengthy discussions to eliminate magnetic components from their motors. Assembly of the equipment is required for the prototype sub-millimeter SQUID system. The temperature controller for the existing Janis continuous flow cryostat, and a Cooke 3-inch vacuum system was obtained. Obtained were all of the analog and digital hardware and presently completing are the software for the microcomputer controls of the temperature controller, the pumping system, and the data acquisition system. Developed is the analytic models required to interpret two-dimensional magnetic field maps in terms of the current distributions that produce them. The detailed mechanical design was completed for a 6-foot by 5-foot by 3-foot, four-layer, magnetically shielded enclosure. (JHD)