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

Qin, Huafeng, Zhao, Xiang, Liu, Shuangchi, Paterson, Greig A ORCID: 0000-0002-6864-7420, Jiang, Zhaoxia, Cai, Shuhui, Li, Jinhua, Liu, Qingsong and Zhu, Rixiang
(2020) An ultra-low magnetic field thermal demagnetizer for high-precision paleomagnetism. EARTH PLANETS AND SPACE, 72 (1).

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

Item Type: Article
Uncontrolled Keywords: Paleomagnetism, Thermal demagnetization, Furnace, AC magnetic field, Residual magnetic field, Heating wire structure, Straight core solenoid
Divisions: Faculty of Science and Engineering > School of Environmental Sciences
Depositing User: Symplectic Admin
Date Deposited: 06 Sep 2021 07:57
Last Modified: 18 Jan 2023 21:30
DOI: 10.1186/s40623-020-01304-0
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