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9 papers · 2 filters
Low relaxation rate in a low-Z alloy of iron
C. Scheck, L. Cheng, I. Barsukov +2
The longest relaxation time and sharpest frequency content in ferromagnetic precession is determined by the intrinsic (Gilbert) relaxation rate \emph{}. For many years, pure iro…
Magnetic coupling in CoCr_2O_4 and MnCr_2O_4: an LSDA+U study
Claude Ederer, Matej Komelj
We present a first principles LSDA+U study of the magnetic coupling constants in the spinel magnets CoCr_2O_4 and MnCr_2O_4. Our calculated coupling constants highlight the possibl…
Dependence of Mobility on Density of Gap States in Organics by GAMEaS - Gate Modulated Activation Energy Spectroscopy
W. So, D. V. Lang, V. Y. Butko +3
We develop a broadly applicable transport-based technique, GAte Modulated activation Energy Spectroscopy (GAMEaS), for determining the density of states (DOS) in the energy gap. GA…
Renormalization of Molecular Electronic Levels at Metal-Molecule Interfaces
J. B. Neaton, Mark S. Hybertsen, Steven G. Louie
The electronic structure of benzene on graphite (0001) is computed using the GW approximation for the electron self-energy. The benzene quasiparticle energy gap is predicted to be…
Diameter and Chirality Dependence of Exciton Properties in Carbon Nanotubes
Rodrigo B. Capaz, Catalin D. Spataru, Sohrab Ismail-Beigi +1
We calculate the diameter and chirality dependences of the binding energies, sizes, and bright-dark splittings of excitons in semiconducting single-wall carbon nanotubes (SWNTs). U…
Weakly Coupled Motion of Individual Layers in Ferromagnetic Resonance
D. A. Arena, E. Vescovo, C. -C. Kao +2
We demonstrate a layer- and time-resolved measurement of ferromagnetic resonance (FMR) in a Ni81Fe19 / Cu / Co93Zr7 trilayer structure. Time-resolved x-ray magnetic circular dichro…