Mapping Nanomagnetic Fields Using a Radical Pair Reaction

[摘要]：We used a fluorescent chemical indicator of magnetic field to visualize the magnetic field around ferromagnetic nanostructures. The indicator was a chain-linked electron donor-acceptor molecule, phenanthrene-(CH2)(12)-O-(CH2)(2)-dimethylaniline, that forms spin-correlated radical pairs upon photoexcitation. The magnetic field altered the coherent spin dynamics, yielding an 80% increase in exciplex fluorescence in a 0.1 T magnetic field. The magnetic field distributions were quantified to precision of 1.8 x 10(-4) T by image analysis and agreed with finite-element nanomagnetic simulations.

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