Exploiting the precession of a levitated magnetic particle in ultra-high vacuum, it is shown that ac magnetic fields smaller than a picotesla can be detected. It is also argued that this new AC magnetometer will have a large dynamic range of more than a millitesla and can be continuously tuned over several GHz. Such a magnetometer can be used as a receiver for electromagnetic waves.
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Anisur Rahman (2024) studied this question.
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