We demonstrate theoretically that by placing a ferromagnetic particle betweena nitrogen-vacancy (NV) magnetometer and a target spin, the magnetometersensitivity is increased dramatically. Specifically, using materials andtechniques already experimentally available, we find that by taking advantageof the ferromagnetic resonance the minimum magnetic moment that can be measuredis smaller by four orders of magnitude in comparison to currentstate-of-the-art magnetometers. As such, our proposed setup is sensitive enoughto detect a single nuclear spin at a distance of $30$~nm from the surfacewithin less than one second of data acquisition at room temperature. Ourproposal opens the door for nanoscale NMR on biological material under ambientconditions.
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