| AVS 54th International Symposium | |
| Magnetic Interfaces and Nanostructures | Thursday Sessions |
| Session MI-ThA |
| Session: | Magnetic Semiconductors II |
| Presenter: | S.T. Ochsenbein, University of Washington |
| Authors: | S.T. Ochsenbein, University of Washington K.M. Whitaker, University of Washington W.K. Liu, University of Washington D.R. Gamelin, University of Washington |
| Correspondent: | Click to Email |
Magnetically doped semiconductor nanocrystals present an interesting motif for possible spintronics applications. In such so-called diluted magnetic semiconductors (DMSs) the interaction between charge carriers and the dopant ions is the key factor defining their spintronics functionality. Ferromagnetism in some DMSs is attributed to carrier-mediated interaction between the dopant ions for example,1 and thus depends strongly on carrier-dopant interactions. The effect of quantum confinement in DMS nanostructures on carrier-dopant interactions has been the subject of theoretical considerations,2 but experimental investigations are scarce. We present experimental results addressing electron-Mn2+ interactions in colloidal Mn2+:ZnO nanocrystals. Photochemical injection of conduction band electrons3 allows the interaction between these quantum confined electrons and the Mn2+ ions to be studied by electron paramagnetic resonance (EPR) spectroscopy and magnetic measurements. The microscopic origins of the resulting perturbed magnetic properties will be described.
1 Dietl, T.; Ohno, H.; Matsukura, F., Phys. Rev. B 2001, 63, 195205.
2 Bhattacharjee, A. K., Phys. Rev. B. 1998, 58, 15660.
2 Liu, W. K.; Whitaker, K. M.; Kittilstved, K. R.; Gamelin, D. R., J. Am. Chem. Soc. 2006, 128, 3910. .