Magnetic Nanoparticles and Resonant Switching
Kirill Rivkin
Department of Physics, Texas A&M University, College Station, TX
Date: May 18, 2007, Time: 3:30 pm, Location: W122-D3 Engineering Building 1, The University of Houston
Abstract:
Over the past decade magnetic manoparticles have been a subject of extensive research, with a special consideration given to the possibility of their use for information storage and processing. At the same time conventional methods of operating magnetic memory are approaching their limits and a number of new techniques have been proposed, some are based on destroying the initial magnetization state by heating the magnetic material above the Curie temperature, followed by remagnetization in the presence of relatively small external magnetic DC field and some are based on exploiting the intrinsic resonant properties of magnetic structures in order to improve the effectiveness of information writing process.
Our presentation will consist of two parts – in first we are going to discuss analytical and numerical tools (micromagnetics) that are being used to study collective and individual behavior of magnetic nanoparticles. In the second part we are going to show how the results of such studies can be used to improve by a few orders of magnitude the coupling between magnetic excitations in nanoparticles and external time dependent magnetic pulses, resulting in a very effective writing mechanism.
