  The mechanical properties of nanostructured wires obtained by co-assembly of
iron oxide particles are studied. The intrinsic magnetic properties of the
wires are used to induce and quantify the bending of the one-dimensional
objects. From the relationship between the deflection and the magnitude of the
magnetic field, the elastic rigidity and Young modulus of the wires are
determined. Young moduli in the megapascal range are obtained and are
consistent with sub-piconewton force detection.
