Nanotechnology

New applied physics study findings have been published by D.V. Berkov and colleagues

  2008 NOV 17 - (VerticalNews.com) -- According to a study from Jena, Germany, "In this paper, we present an overview of recent progress made in understanding of the spin-torque induced magnetization dynamics in nanodevices using mesoscopic micromagnetic simulations. In the first part, we perform a detailed quantitative comparison between numerical modelling and experimental data obtained on nanopillar devices."

  "Here we show that although many qualitative features of the observed dynamics can be satisfactorily explained by full-scale micromagnetic models, our understanding of nanopillar experiments is still far from being complete. This manifests itself not only in the incorrect current dependence of the simulated microwave power, but also in the systematic discrepancy between measured and simulated oscillation frequencies; the latter should be considered as an especially alarming signal. We proceed with the numerical analysis of the point contact experiments. These systems demonstrate a much more complicated magnetization dynamics (compared with nanopillars). Numerical simulations reveal that such rich behaviour is due to the formation of several kinds of strongly non-linear oscillation modes. Simulations not only confirm the analytically predicted existence of a so-called non-linear 'bullet', but also predict a much more complicated non-linear mode governed by creation and annihilation of at least two vortex-anti vortex pairs," wrote D.V. Berkov and colleagues.

  The researchers concluded: "We conclude with several remarks concerning the crucial importance of a thorough characterization of experimentally studied systems and possible extensions of numerical models required to resolve the above mentioned contradictions between experiment and simulations."

  Berkov and colleagues published the results of their research in the Journal of Physics D - Applied Physics (Non-linear magnetization dynamics in nanodevices induced by a spin-polarized current: micromagnetic simulation. Journal of Physics D - Applied Physics, 2008;41(16):64013).

  For additional information, contact D.V. Berkov, Innovent Technology Development, Prussingstr 27B, D-07745 Jena, Germany.

  The publisher of the Journal of Physics D - Applied Physics can be contacted at: IOP Publishing Ltd., Dirac House, Temple Back, Bristol BS1 6BE, England.

  Keywords: Electronics, Emerging Technologies, Mathematics, Microwaves, Nanodevices, Nanopillar, Nanotech, Nanotechnology, Numerical AnalysisApplied Physics.

  This article was prepared by VerticalNews Nanotechnology editors from staff and other reports. Copyright 2008, VerticalNews Nanotechnology via VerticalNews.com.