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Their noise levels are as low as 3 fT·Hz^-1/2. For comparison, a typical refrigerator magnet produces 10^-2 T, and some processes in animals produce very small magnetic fields between 10^-9 T and 10^-6 T. SERF atomic magnetometers, invented in the early 2000s are potentially more sensitive and do not require cryogenic refrigeration but are orders of magnitude

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