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
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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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