Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8164078 | Physica C: Superconductivity and its Applications | 2018 | 6 Pages |
Abstract
Magnetic properties of rocks are crucial for paleo-, rock-, environmental-magnetism, and magnetic material sciences. Conventional rock magnetometers deal with bulk properties of samples, whereas scanning microscope can map the distribution of remanent magnetization. In this study, a new scanning microscope based on a low-temperature DC superconducting quantum interference device (SQUID) equipped with an in-situ magnetization/demagnetization device was developed. To realize the combination of sensitive instrument as SQUID with high magnetizing/demagnetizing fields, the pick-up coil, the magnetization/demagnetization coils and the measurement mode of the system were optimized. The new microscope has a field sensitivity of 250âpT/âHz at a coil-to-sample spacing of â¼350â¯Âµm, and high magnetization (0-1 T)/ demagnetization (0-300 mT, 400â¯Hz) functions. With this microscope, isothermal remanent magnetization (IRM) acquisition and the according alternating field (AF) demagnetization curves can be obtained for each point without transferring samples between different procedures, which could result in position deviation, waste of time, and other interferences. The newly-designed SQUID microscope, thus, can be used to investigate the rock magnetic properties of samples at a micro-area scale, and has a great potential to be an efficient tool in paleomagnetism, rock magnetism, and magnetic material studies.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Du Junwei, Liu Xiaohong, Qin Huafeng, Wei Zhao, Kong Xiangyang, Liu Qingsong, Song Tao,