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(a) TEM image of Au-Fe3O4 dumbbell nanoparticles (b) 2D small angle neutron scattering (SANS) pattern of the dumbbell nanoparticles showing the ordering of the particles in an applied magnetic field. (c) High resolution TEM image of an iron oxide nanoparticle. (d) Characteristic pattern of the nuclear-magnetic interference term obtained as a difference between spin channels of a SANS experiment with polarized neutrons.