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  • Dr. Ivan K. Schuller from Physics Department, Univ. of  California San Diego gave a colloquium on Nanostructures: Confinement, Proximity and Induced Effects on October 6, 2005.

Dr. Ivan K. Schuller, a professor at Physics Department at University of California San Diego, gave audiences of college of Science of UTA a colloquium. The talk is titled "Nanostructures: Confinement, Proximity and Induced Effects". Dr. Schuller described a variety of representative basic research results, which illustrated some of the exciting and novel results when magnetic and/or superconducting materials were confined into small dimensions. Interesting effects were observed when these dimensions were comparable to magnetic length scales such as dipolar, exchange, and domain sizes and superconducting length scales such as the penetration and coherence lengths.

The abstract of the colloquium is as follows:  Magnetic nanostructures are receiving increasing attention in recent years, motivated by the interesting phenomena when the physical size becomes comparable to relevant magnetic length scales. In addition a number of important potential applications in the sensors and storage industries have emerged. When magnetic nanostructures are in contact with other dissimilar magnetic materials and because their magnetic fields extend considerably outside the physical structure they are very susceptible to interactions with the surrounding environment. A particularly interesting situation is one in which a ferromagnetic nanostructure is in contact with an antiferromagnetic substrate. In this "exchange biased" configuration, a variety of unusual phenomena arise; the reversal mode of the ferromagnet changes considerably, the superparamagnetic transition temperature is affected and there is a noticeable change in the microscopic spin configuration. I will describe a series of experiments in which we studied these phenomena in nanostructured ferromagnets prepared by electron beam lithography and self assembly.

 

 

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