Theoretical Studies of the Nanostructures for Data Storage and Retrieval Devices

Prof. Sitaram Jaswal

University of Nebraska-Lincoln

Wednesday, March 9, 2005, 4:00 PM

 

     Abstract:

  As we know, the data storage capacity almost doubles every year which has been happening for the last several years. This means that the bit size is getting smaller and smaller every year leading to the current interest in nanostructures. For the authenticity of the stored data, the cross talk between the data bits must be as little as possible. This requires the study of interactions among nanostructures for their possible applications in data storage devices. Exchange interactions are the most important at small inter-particle separations. We will look at the magnetism of Co particles as a function of their size in a Cu matrix. First-principles calculations will be compared with the experimental data. Inter-particle exchange interaction will be calculated as a function of their separation and the results will be compared with the RKKY-type interaction. Micromagnetic simulations of thin films of FePt particles as a function of the inter-particle exchange interaction will be presented to show how exchange coupling affects the magnetization reversal.
  Finally smaller and smaller bit size requires more and more sensitive read and write heads. This requires the study of magnetoresistive devices based on GMR and TMR effects. Organic spacers are being studied for their applications in TMR devices. Here I will present some results on the adsorption characteristics  of an organic molecule, methanethiol, on a Co surface, a first step towards understanding the feasibility of such a spacer.

 


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