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 m r of 1.1 kg dummy copper test mass, and the measurement result is (6.45±0.04(stat)±0.07(syst)) × 10−8 A⋅m2. The measurement precision of the m r is about 0.9 nA⋅m2, 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.
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