Selected graphics and movies for magnetism

From research supported in part by the NSF

• Langevin micromagnetic simulations of nanoscale pillars.
  Both still pictures and movies are available.
  Movies show both pillars with small aspect ratio (24x24x120 nm) and pillars with a large aspect ratio (9x9x150 nm).
  
  
• mpeg movie (about 4Mega)
  of a Monte Carlo simulation for domain-wall motion in an Fe sesquilayer on W(110)
  from the paper "Monte Carlo Simulation of Magnetization Reversal in Fe Sequilayers on W(110)" M. Kolesik, M. A. Novotny, and P. A. Rikvold. Phys. Rev. B 56, 11791-11796 (1997). Preprint: cond-mat/9706036. Smaller version of the movie (about 800K) .
  
  
• Metastable decay in uniaxial magnetic models. Graphics showing the simulations for the homogeneous square-lattice Ising ferromagnet for both single-droplet (SD) decay and multi-droplet (MD) decay. Also photographs for the decay in the d=3 Ising model.
  Larger graphics for the SD (Single Droplet) and MD (Multi-Droplet) regions.
  
  
• Is the probability of not switching in nanoscale ferromagnets a stretched exponential? A MATHEMATICA 3.0 fit to a Monte Carlo simulation of a 100x100 square-lattice Ising model using Glauber dynamics at 0.8T_c, fit with both a stretched exponential (gray dashed line) and an error function (red line) as predicted in our paper "Magnetization Switching in Nanoscale Ferromagnetic Grains: Description by a Kinetic Ising Model" J. Magnetism and Magnetic Materials, 150, 37 (1995). (The entire MATHEMATICA 3.0 notebook for the above.) From the paper ``Magnetization Switching in Single-Domain Ferromagnets.'' M. A. Novotny, M. Kolesik, and P. A. Rikvold. J. Magn. Magn. Mater., in press. Preprints: FSU-SCRI-97-90 and cond-mat/9710267.
  
  
• An interactive JAVA simulation for the three dimensional Ising model in a magnetic field. his code was written by D.M. Townsley, an undergraduate student in our group. This model was used for the paper ``Projected Dynamics for Metastable Decay in Ising Models.'' M. Kolesik, M. A. Novotny, P. A. Rikvold, and D. M. Townsley. In Computer Simulation Studies in Condensed Matter Physics X, edited by D. P. Landau, K. K. Mon, and H. B. Schüttler, Springer Proceedings in Physics (Springer, Berlin, 1998), Vol. 83, pp. 246-251. Preprint: cond-mat/9703115, as well as for a longer paper in preparation.
  
  
• Graphics for hysteresis loop, Landau free energies, and movies of Single Droplet and Multi-Droplet decay.
  
  
• Links for 1998 talk on the superparamagnetic limit.
  
  

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