An ultra-low magnetic field thermal demagnetizer for high-precision paleomagnetism

• DOI: 10.1186/s40623-020-01304-0
• Publication Date: 2020-11-04T12:46:02Z
• Authors: Huafeng Qin; Xiang Zhao; Shuangchi Liu; Greig A. Paterson; Zhaoxia Jiang; Shuhui Cai; Jinhua Li; Qingsong Liu; Rixiang Zhu
• Keywords: Solenoid

Abstract Thermal demagnetization furnaces are widely used paleomagnetic facilities for progressive removal of naturally acquired magnetic remanence or the imparting well-controlled laboratory magnetization. An ideal thermal demagnetizer should maintain “zero” field in sample chamber during treatments. However, noises, including residual fields construction material and induced caused by alternating current (AC) heating element always present, which can contaminate results at elevated temperatures especially magnetically weak samples. Here, we designed a new structure wire named “straight core solenoid” to develop furnace with ultra-low noise. Simulation practical measurements show that be greatly reduced using technology. experiments demonstrate yield low noise even weakly