Per Arne Rikvold, Professor of Physics

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Department of Physics
School of Computational Science (SCS)
Center for Materials Research and Technology (MARTECH)

Florida State University, Tallahassee, FL 32306-4052, USA

Tel.: (850) 644-6011/6814

Fax.: (850) 644-0098

E-mail: rikvold@csit.fsu.edu

• Theoretical materials science and condensed-matter physics.
• Computational statistical mechanics and its applications in materials science and chemistry.

• National Science Foundation: Grant No. DMR-963483, Non-Perturbative Studies of Lattice-Gas Models in Materials Science.
• National Science Foundation: Grant No. DMR-9871455, Computational Studies of Dynamical Phenomena in Nanoscale Ferromagnets (with M.A. Novotny).
• Department of Energy: National Energy Research Scientific Computing Center (NERSC) supercomputer time.

• G. Brown, M. A. Novotny, and P. A. Rikvold, ``Micromagnetic Simulations of Thermally Activated Magnetization Reversal of Nanoscale Magnets.'' Submitted to J. Appl. Phys. Preprints: FSU-SCRI-99-52 and cond-mat/9909136

G. Brown, P.A. Rikvold, M.A. Novotny, and A. Wieckowski, ``Simulated Dynamics of Underpotential Deposition of Cu with Sulfate on Au(111).'' J. Electrochem. Soc. 146, 1035-1040 (1999). Preprint: cond-mat/9709320.

Note: While they work fine in most instances, these MPEG files have been reported to cause problems or be unplayable with some combinations of platforms and players. We apologize and are working to solve the problem.

• A 20 mV negative-going potential-step simulation through Peak A (Fig. 8 in paper). Transition from disordered low-coverage phase to ordered (R3xR3) phase. Total simulated time is approximately 0.928 s (1.86E+9 MCSS). The corresponding current transient is shown in Fig. 7(A) for times up to 2.5 s.
  (About 6MB.)
• A 24 mV positive-going potential-step simulation through Peak A'. Transition from ordered (R3xR3) phase to disordered low-coverage phase. Total simulated time is approximately 0.995 s (1.99E+9 MCSS). The corresponding current transient is shown in Fig. 7(A'). During this time, the system decays to an intermediate, metastable (R3xR3) phase with 1/3 ML of both Cu and sulfate.
  (About 2MB.)
• A 24 mV positive-going potential-step simulation through Peak A'. Transition from ordered (R3xR3) phase to disordered low-coverage phase. Total simulated time is approximately 34.5 s (6.89E+10 MCSS). This is a longer version of the the movie above, showing the final decay to the disordered low-coverage phase. Since the lifetime of the intermediate, metastable phase is long, and Cu and sulfate desorption give partial currents of opposite sign, the corresponding current transient is very weak. The first 1.0 s of the current transient is shown in Fig. 7(A').
  (About 8MB.)
• A 19 mV negative-going potential-step simulation through Peak B. Transition from ordered (R3xR3) phase to Cu monolayer. Total simulated time is approximately 23.4 s (4.68E+10 MCSS). The corresponding current transient is shown in Fig. 6(B) for times up to 25 s.
  (About 2MB.)
• A 30 mV positive-going potential-step simulation through Peak B'. Transition from Cu monolayer to ordered (R3xR3) phase. Total simulated time is approximately 9.95 s (1.99E+10 MCSS). The first 7 s of the corresponding current transient is shown in Fig. 6(B').
  (About 2MB.)

1. M. Kolesik, M.A. Novotny and P.A. Rikvold, "Monte Carlo Simulation of Magnetization Reversal in Fe Sequilayers on W(110)." Phys. Rev. B 56, 11791-11796 (1997). Preprint: cond-mat/9706036.

2. P.A. Rikvold, M.A. Novotny, M. Kolesik, and H.L. Richards, ``Nucleation Theory of Magnetization Switching in Nanoscale Ferromagnets,'' In Dynamical Properties of Unconventional Magnetic Systems, edited by A.T. Skjeltorp and D. Sherrington (Kluwer, Dordrecht, 1997).

• Domain-wall motion in an Fe sesquilayer on W(110)
  (About 800KB.)
• The same animation in color, larger
  (About 4MB.)

1. P.A. Rikvold et al., ``Computational Lattice-Gas Modeling of the Electrosorption of Small Molecules and Ions,'' Surface Science 335 (1995) 389.

2. M. Gamboa-Aldeco et al., ``Coadsorption of Hydrogen with Sulfate Anion and Urea on Single Crystal Surfaces,'' Electrochemical Society Conference Proceedings Series 94-21 (1994) 184.

3. M. Gamboa-Aldeco et al., ``Adsorption of Urea on the Pt(100) Electrode: Experiments and Lattice-Gas Modeling," Surface Science Letters 297 (1993) L135.

4. P.A. Rikvold et al., ``Monte Carlo Simulation of Urea Electrosorption on Platinum,'' in Computer Simulation Studies in Condensed Matter Physics VI, edited by D. P. Landau et. al. (Springer, Berlin, 1993).

• Electrochemical Adsorption of Urea on Platinum (100). Part 1.
(About 2MB.)
• Electrochemical Adsorption of Urea on Platinum (100). Part 2.
(About 4MB.)
• Electrochemical Adsorption of Urea on Platinum (100). Part 3.
(About 4MB.)