1 School of Aeronautics and Astronautics, Sun Yat-sen University, Guangzhou 510275, China; 2 School of Physics and Electronic Engineering, Hubei University of Arts and Science, Xiangyang 441053, China; 3 School of Mathematics, Physics and Optoelectronic Engineering, Hubei University of Automotive Technology, Shiyan 442002, China; 4 MOE Key Laboratory of TianQin Mission, TianQin Research Center for Gravitational Physics&School of Physics and Astronomy, Frontiers Science Center for TianQin, Gravitational Wave Research Center of CNSA, Sun Yat-sen University(Zhuhai Campus), Zhuhai 519082, China
Abstract In TianQin spaceborne gravitational-wave detectors, the stringent requirements on the magnetic cleanliness of the test masses demand the high resolution ground-based characterization measurement of their magnetic properties. Here we present a single frequency modulation method based on a torsion pendulum to measure the remanent magnetic moment of kg dummy copper test mass, and the measurement result is . The measurement precision of the is about , well below the present measurement requirement of TianQin. The method is particularly useful for measuring extremely low magnetic properties of the materials for use in the construction of space-borne gravitational wave detection and other precision scientific apparatus.
Fund: This work is supported by the National Key R&D Program of China (Grant No. 2020YFC2200500) and the National Natural Science Foundation of China (Grant Nos. 12075325, 12005308, and 11605065).
Min-Na Qiao(乔敏娜), Lu-Hua Liu(刘鲁华), Bo-Song Cai(蔡柏松), Ya-Ting Zhang(张雅婷),Qing-Lan Wang(王晴岚), Jia-Hao Xu(徐家豪), and Qi Liu(刘祺) Measurement of remanent magnetic moment using a torsion pendulum with single frequency modulation method 2023 Chin. Phys. B 32 050702
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