National Synchrotron Light Source Seminar

"Density Functional Studies of Diluted Magnetic Semiconductors and Magnetic Thin Films"

Presented by Ruqian Wu, Department of Physics and Astronomy, University of California, Irvine

Thursday, June 30, 2005, 10:00 am — Seminar Room, Bldg. 725

Density functional simulations play an important role in explaining experimental observations and predicting new phenomena/materials for innovative applications. I will discuss results of our recent studies for properties of several diluted magnetic semiconductors, alloys and thin films. For example, we demonstrated that XMCD can be used as a tool to identify the local atomic structures of (Ga,Mn)As, and established a model that a large percentage of interstitial/substitutional Mn dimers is involved in this DMS. We also studied the k-edge of XMCD of O atoms on various magnetic surfaces for understanding the mechanism of spin-reorientation transitions. It was found that DFT calculations provide highly reliable results for most cases.

Hosted by: Chi-Chang Kao

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