AVS 53rd International Symposium
    Electronic Materials and Processing Wednesday Sessions
       Session EM+MI-WeA

Invited Paper EM+MI-WeA1
Spectroscopy and Magnetism of Oxide Diluted Magnetic Semiconductors

Wednesday, November 15, 2006, 2:00 pm, Room 2003

Session: Magnetic Semiconductors
Presenter: D.R. Gamelin, University of Washington
Authors: D.R. Gamelin, University of Washington
K.R. Kittilstved, University of Washington
W.K. Liu, University of Washington
Correspondent: Click to Email
Diluted magnetic semiconductor (DMS) nanostructures are pivotal architectural elements in many proposed spintronics devices. DMSs of ZnO are being intensely investigated for their potential use in spintronics technologies, but such applications have been hindered by their inconsistent magnetic properties. This talk will present our group's recent advances in the use of targeted chemical perturbations to manipulate high-Tc spin ordering in ZnO DMSs predictably and controllably.@footnote 1,2,3,4@ Apart from the technological advantages of reliable, controllable, and even switchable high-Tc ferromagnetic semiconductors, these experiments are motivated by the new fundamental insights they provide into the microscopic mechanisms behind magnetic ordering in this class of materials. The results from concomitant optical, magneto-optical, structural, X-ray absorption, and magnetic data collected on the same materials will be used to evaluate dopant electronic structure contributions to magnetic ordering, and the findings will be discussed in the context of current theoretical models of high-Tc ferromagnetism in oxide DMSs. @FootnoteText@ @footnote 1@Kittilstved, K. R.; Liu, W. K.; Gamelin, D. R. "Electronic Structure Origins of Polarity Dependent High-Tc Ferromagnetism in Oxide Diluted Magnetic Semiconductors." Nature Materials, 2006, 5, 291-297.@footnote 2@Kittilstved, K. R.; Norberg, N. S.; Gamelin, D. R. "Chemical Manipulation of 300K Ferromagnetism in ZnO Diluted Magnetic Semiconductors." Phys. Rev. Lett., 2005, 149049.@footnote 3@Kittilstved, K. R.; Gamelin, D. R. "Activation of High-Tc Ferromagnetism in Mn2+:ZnO using Amines." J. Am. Chem. Soc., 2005, 127, 5292-5293.@footnote 4@Schwartz, D. A.; Gamelin, D. R. "Reversible 300K Ferromagnetic Ordering in a Diluted Magnetic Semiconductor." Advanced Materials, 2004, 16, 2115-2119.