Scanning SQUID microscope with an in-situ magnetization/demagnetization field for geological samples
| Autor: | Zhao Wei, Jun-Wei Du, Xiangyang Kong, Huafeng Qin, Xiao-Hong Liu, Tao Song, Qing Song Liu |
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| Rok vydání: | 2018 |
| Předmět: |
Scanning SQUID microscope
Materials science Microscope 010504 meteorology & atmospheric sciences Condensed matter physics Magnetometer Demagnetizing field Energy Engineering and Power Technology 010502 geochemistry & geophysics Condensed Matter Physics 01 natural sciences Rock magnetism Electronic Optical and Magnetic Materials law.invention SQUID Magnetization law Remanence Electrical and Electronic Engineering 0105 earth and related environmental sciences |
| Zdroj: | Physica C: Superconductivity and its Applications. 547:1-6 |
| ISSN: | 0921-4534 |
| Popis: | 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 250 pT/√Hz at a coil-to-sample spacing of ∼350 µm, and high magnetization (0–1 T)/ demagnetization (0–300 mT, 400 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. |
| Databáze: | OpenAIRE |
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