Hall detection of magnetic resonance

We propose a detection method for magnetic resonance experiments based on t he use of a Hall effect device. To demonstrate its feasibility, we have mea sured the quasistatic and radio-frequency magnetic fields generated by the unpaired electrons contained in a (50 mum)(3) grain of diphenylpicrylhydraz il, excited into magnetic resonance in a 10 mT static magnetic field. The p roposed technique has the same versatility of the conventional inductive me thod but, potentially, allows one to perform magnetic resonance spectroscop y and imaging studies with submicron spatial resolution. (C) 2001 American Institute of Physics.