Professor Heiman's research group focuses on several challenging and technologically important areas: (1) Topological Insulators; (2) Rare-earth-free Magnets; (3) Spintronic Materials and Devices; (4) Nanodots and Nanowires Composed of Ferromagnets and Ferromagnetic Semiconductors; and (5) Molecular Beam Epitaxy (MBE) Crystal Growth. The group's experimental tools include MBE apparatus, magnetotransport and magneto-optics up to 14 tesla, and SQUID magnetometer. Collaborators include University of Leeds, Brookhaven National Laboratory, MIT Nanospintronics and Superconductivity Lab, and The University of Edinburgh.
Articles
Ferromagnetism in thin-film Cr-doped topological insulator Bi₂Se₃ (with P. P.J. Haazen, J. -B. Laloe, T. J. Nummy, H. J.M. Swagten, P. Jarillo-Herrero, and J. S. Moodera), Physics Faculty Publications (2012)
We report on the observation of ferromagnetism in epitaxial thin films of the topological insulator...
Large coercivity in nanostructured rare-earth-free MnₓGa films (with Tom Nummy, Steve Bennett, and Tom Cardinal), Appl. Phys. Lett (2011)
The magnetic hysteresis of MnₓGa films exhibit remarkably large coercive fields as high as μₒHC=2.5...
Large coercivity in nanostructured rare-earth-free MnxGa films (with Tom Nummy, Steve Bennett, and Tom Cardinal), Appl. Phys. Lett (2011)
The magnetic hysteresis of MnxGa films exhibit remarkably large coercive fields as high as HC=2.5...
Magnetic signature of symmetry reduction in epitaxial La₀.₆₇Sr₀.₃₃MnO₃ films (with Radhika Barua and L. H. Lewis), Physics Faculty Publications (2011)
The magnetic properties of epitaxially grown La0.67Sr0.33MnO3 perovskite thin films were investigated to elucidate an...
Large low field magnetoresistance in La₀.₆₇Sr₀.₃₃MnO₃ nanowire devices (with Battogtokh Jugdersuren, Sungmu Kang, Robert S. DiPietro, David McKeown, Ian L. Pegg, and John Philip), Physics Faculty Publications (2011)
Large low field magnetoresistance (LFMR) of about 28% is observed in La0.67Sr0.33MnO3 nanowires with 80...
Preprints
Investigation of electrical transport in hydrogenated multiwalled carbon nanotubes (with Adam L. Friedman, Hyunkyung Chun, Yung Joon Jung, and Latika Menon), U.S. Navy Research (2011)
Highly disordered multiwalled carbon nanotubes of large outer diameter (~60 nm) fabricated by means of...