zimanyi.ucdavis.edu
Magnets for Energy and Recording | Zimanyi Group
http://zimanyi.ucdavis.edu/magnets
Magnets for Energy and Recording. In the area of permanent magnets, we are exploring the reversal mechanism of hard permanent magnets in order to improve their utility for alternative energy purposes. We strive to develop stronger permanent magnets with higher Curie temperatures and lower rare-earth content. We study the competition of domain wall propagation and nucleation in sintered and nanostructured rare earth magnets. We are analyzing hard-soft composite structures. The OOMMF code for micromagnetics.
zimanyi.ucdavis.edu
Solar Desalination | Zimanyi Group
http://zimanyi.ucdavis.edu/memristors
We have invented photovoltaic desalination. We have provided the proof of concept experimentally. We are performing extensive simulations to analyze the dynamics of desalination/flushing cycle. Our simulations start on the atomistic scale to model nanometer-size features of the adsorbent surface. A COMSOL simulation of ion-adsorbing hydrodynamics in individual channels is developed as the next hierarchical level. Finally, an effective-medium description of the desalination cell is dev...
zimanyi.ucdavis.edu
Memristors | Zimanyi Group
http://zimanyi.ucdavis.edu/vortex-physics
We are exploring the revolutionary memristor paradigm that promises to redefine the architecture of computers. We study the electronic transport with explicit inclusion of underlying vacancy dynamics. We focus on the hysteretic switching phenomena. Molecular Dynamics, Long range interactions. Comparative study of transport models for bipolar switching in memristors. Defect model for bipolar resistive switching in metal-insulator-metal heterostructures. Submitted to Phys. Rev. B (2013). Stanford, CA (2011).
zimanyi.ucdavis.edu
Glassy Systems | Zimanyi Group
http://zimanyi.ucdavis.edu/glassy-system
We are exploring the slow dynamics, the glassy phases and memory and aging effects of spin glasses, dislocation systems and Coulomb glasses. We also analyze the formation of avalanches and their statistics. Using scaling analysis, we research the conditions which give rise to Self Organized Criticality. Parallel tempering and other accelerated Monte Carlo techniques, Scaling analysis. Probing Short Range Spin Glasses with Avalanches. Submitted to Phys. Rev. B. (2013). March meeting, New Orleans, LA (2008).
zimanyi.ucdavis.edu
Solar Energy | Zimanyi Group
http://zimanyi.ucdavis.edu/solar-energy
Enhancing CM by NP structural relaxation and using exotic, high pressure phase NP cores. Transport in the solar cell devices is modeled by Monte Carlo hopping or Boltzmann band-transport theories. We are part of the NSF. Quantum Espresso LDA for one particle band structure, GW for improved energy levels. Time dependent DFT for absorption. Many body perturbation theory for Impact Ionization rates. Bethe-Salpeter equations and Lanczos methods for the dielectric matrix. Monte Carlo modeling of transport in ...
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