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

Qin，Huafeng1; Zhao，Xiang1,2; Liu，Shuangchi1; Paterson，Greig A.3,4; Jiang，Zhaoxia1,5; Cai，Shuhui1; Li，Jinhua3; Liu，Qingsong1,6; Zhu，Rixiang1

2020-12-01

10.1186/s40623-020-01304-0

EARTH PLANETS AND SPACE   影响因子和分区

1343-8832

1880-5981

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. [Figure not available: see fulltext.]

AC magnetic field Furnace Heating wire structure Paleomagnetism Residual magnetic field Straight core solenoid Thermal demagnetization

SCI

英语

其他

NSFC[41674073] ; Project of National Deep Exploration Technology and Experimental Research[SinoProbe-09-02(201011079)] ; NERC Independent Research Fellowship[NE/P017266/1]

Geology

Geosciences, Multidisciplinary

WOS:000590067400004

SPRINGER

GEOSCIENCES

2-s2.0-85094966149

Scopus

1.State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,100029,China
2.Research School of Earth Sciences,Australian National University,Canberra,ACT 2601,Australia
3.Key Laboratory of Earth and Planetary Physics,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,100029,China
4.Department of Earth,Ocean and Ecological Sciences,University of Liverpool,Liverpool,L69 7ZE,United Kingdom
5.Key Laboratory of Submarine Geosciences and Prospecting Techniques,Ministry of Education,and College of Marine Geosciences,Ocean University of China,Qingdao,266100,China
6.Department of Marine Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Qin，Huafeng,Zhao，Xiang,Liu，Shuangchi,et al. An ultra-low magnetic field thermal demagnetizer for high-precision paleomagnetism[J]. EARTH PLANETS AND SPACE,2020,72(1).

Qin，Huafeng.,Zhao，Xiang.,Liu，Shuangchi.,Paterson，Greig A..,Jiang，Zhaoxia.,...&Zhu，Rixiang.(2020).An ultra-low magnetic field thermal demagnetizer for high-precision paleomagnetism.EARTH PLANETS AND SPACE,72(1).

Qin，Huafeng,et al."An ultra-low magnetic field thermal demagnetizer for high-precision paleomagnetism".EARTH PLANETS AND SPACE 72.1(2020).