Low Cost High Sensitivity Superconducting Magnetometers and Gradiometers
Abstract
Final report developed under SBIR purchase order for topic F2-10310. In the final Phase of this contract, we bench marked the functionality of hardware and software components and evaluated the performance of a high Tc SQUID magnetometer to be used inside a PPMS platform. For this purpose, a specially designed Optical Multi-Function Probe, comprised of a confocal optical microscope, a SQUID sensor shielded by a mu metal shield, and a sample stage with 3-axis motion control was installed in the PPMS platform. This system can visualize the distance between the SQUID and a magnetic sample for the purpose of minimizing it to achieve the highest magnetic detection possible. To achieve the necessary resolution to visualize the SQUID-sample distance, the objective lens of the confocal microscope was installed inside the mu-metal shield close to the SQUID sensor. The objective lens with a focal length of 10 mm enabled to resolve the SQUID-sample distance to about 1.5 microns. A High Tc SQUID could operate between 50 and 5.0 K in the PPMS system depending on the Tc of the SQUID, which was tuned by the focused He ion beam dose at the junctions.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 02, 2022
- Accession Number
- AD1185091
Entities
People
- J Forman
- S Cybart
- S Spagna
- Shozo Yoshizumi
- T Mamedov