"Magnet-in-the-semiconductor" FePt-PbS and FePt-PbSe nanostructures: magnetic properties, charge transport, and magnetoresistance.
We report a synthesis of colloidal nanostructures combining a magnetic material (FePt) with a narrow-gap semiconductor (PbS and PbSe) in form of core-shells or nanodumbbells and explore their optical, magnetic, electrical, and magnetotransport properties. The arrays of "magnet-in-the-semiconductor" nanostructures show semiconductor-type transport properties with magnetoresistance typical for magnetic tunnel junctions, thus combining the advantages of both functional components. We observed gate-controlled charge transport through the arrays of FePt-PbS and FePt-PbSe core-shell nanostructures with an electron mobility of 0.01 cm(2)/(V s) and 0.08 cm(2)/(V s), respectively, combined with ferro- and superparamagnetic behavior and large tunneling magnetoresistance. This work shows that multicomponent colloidal nanostructures can be used as the building blocks for design of multifunctional materials for electronics and optoelectronics.
Lee
Jong-Soo
JS
Department of Chemistry, University of Chicago, Chicago, Illinois 60637, USA.
Bodnarchuk
Maryna I
MI
Shevchenko
Elena V
EV
Talapin
Dmitri V
DV