Office: 267 West Hall
Labs: SB115 Randall
Education: Queen Mary College, University of London, UK B.S.
1969; Queen Mary College, University of London, UK Ph.D. 1973.
Research Field: Condensed Matter Experiment
Research Focus: x-ray physics, materials research, magnetic and
Professor Clarke’s group currently focuses on the physics
of novel epitaxial materials, including magnetic and ferroelectric
thin-film structures. Questions of interest relate to the unusual
properties of thin-film materials that are increasingly important
for microelectronics applications. Ongoing research projects include
· Ferroelectric heterostructures for their extraordinary
dielectric behavior and symmetry-breaking structural transitions
Magnetic nanostructure studies aimed at understanding the link
between structural and magnetic anisotropy in materials for high-density
Diamond-like boron nitride films for field emission and neutron
detection applications. This work is in collaboration with the
Space Physics Research Lab.
Experimental facilities available for this work include several
ultrahigh vacuum chambers instrumented for vapor deposition, ultrafast
laser ablation, and ion-assisted plasma growth techniques. In-situ
diagnostics for thin-film growth include scanning tunneling microscopy
(STM), Reflection High Energy Electron Diffraction (RHEED), and
wafer curvature stress monitoring. Thin-film Kerr magnetometry
is also available, including a novel time-resolved MOKE instrument
in collaboration with the OPIL and FOCUS ultrafast optics facilities
in the Randall Lab. Much of the structural work is carried out
at the Advanced Photon Source, a state-of-the-art synchrotron
x-ray facility located at Argonne National Lab. The work is supported
by private industry, the U.S. Department of Energy Office of Basic
Energy Sciences, and the National Science Foundation.
Professor Clarke is a Fellow of the American Physical Society.
Transient Strain Driven by a Dense Electron-Hole Plasma, (M.F.
DeCamp, D.A. Reis, A. Cavalieri, P.H. Bucksbaum, R. Clarke, R.
Merlin, E.M. Dufresne, D.A. Arms, A.M. Lindenberg, A.G. MacPhee,
Z. Chang, B. Lings, J.S. Wark, S. Fahy), Phys. Rev. Lett. 91,
Effects of Three-Dimensional Atomic Forces in Topographical Imaging
of Atoms with an Atom Force Microscope, (W.L. Wang, S.J. Hu, and
R. Clarke), Phys. Rev. B 68, 245401 (2003).
Direct Determination of Epitaxial Interface Structure: Gd2O3
Passivation of GaAs, (Y. Yacoby, M. Sowwan, E. Stern, J. Cross,
D. Brewe, R. Pindak, J. Pitney, E. Dufresne and R. Clarke), Nature
Materials 1, 99 (2002).