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Composition characterization of ZnO:Cr & ZnO:Co


EMSL Project ID
5095

Abstract

Thin film samples of ZnO:Cr and ZnO:Co have been grown via the co-sputtering method. Our initial magnetic measurements indicate that ZnO:Cr is ferromagnetic up to and above room temperature which is a characteristic of the ideal diluted magnetic semiconductor. I would like to determine the exact compositions of these samples as only the nominal composition is known based on deposition rates, and to find what charge state the Cr exists at. ZnO:Co samples have been historically found to be DMSs, however samples grown by this method in our labs have not shown the expected magnetic signature, instead showing spin-glass behavior. Subsequent vacuum annealing shows improved magnetic properties. For both systems, I would like to determine exact compositions through EDS and RBS, and to determine electronic bonding in both as-prepared and annealed conditions through XPS. For XRD I would like to do 2theta-theta, reflection and texture measurements on only a few of the samples.

Equipment selection is not complete as I need to discuss which devices provides the necessary functionalities.

Project Details

Project type
Exploratory Research
Start Date
2003-10-13
End Date
2006-04-12
Status
Closed

Team

Principal Investigator

Bradley Roberts
Institution
University of Washington

Team Members

Kannan Krishnan
Institution
University of Washington

Related Publications

Brileya KA, LB Camilleri, GM Zane, JD Wall, and MW Fields. 2014. "Biofilm growth Mode Promotes Maximum Carrying Capacity and Community Stability During Product Inhibition Syntrophy." Frontiers in Microbiology 5:693. doi:10.3389/fmicb.2014.00693