title: Mapping nanomagnetic fields using a radical pair reaction.
abstract: 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 1.8×10(-4) T by image analysis and agreed with finite-element nanomagnetic simulations.
authors: Department of Chemistry and Chemical Biology, School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States.
authors: Hohjai
authors: H
authors: Lee
authors: Nan
authors: N
authors: Yang
authors: Adam E
authors: AE
authors: Cohen
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry; D005456:Fluorescent Dyes / Q000737:chemistry; D060526:Magnetic Fields; D059346:Magnets / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*
chemical_list: D000814:Aniline Compounds; D005456:Fluorescent Dyes; C015157:N,N-dimethylaniline