Browsing by Author "Sahele, Asnake"

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    Study of Critical Temperature of Diluted Magnetic Semiconductors (Ga,Mn)As
    (Addis Ababa University, 2011-06) Sahele, Asnake
    (Ga;Mn)As is a very extensively studied diluted magnetic semiconductor. This type of materials bridge over the incompatibilities in metal-semiconductor in-terfaces in electron- ics components and which will have an enormous potential for future spintronics appli- cations, where both charge and spin degrees of freedom can be employed simultaneously. In this work an approach based on the green's function to the Ruderman-Kittel-Kasuya- Yosida quantum spin model is used to calculate the magnetic excitation spectrum in the widely studied (Ga1􀀀xMnx)As diluted magnetic semiconductors. The resulting magnetic excitation spectrum is then used to estimate The total number of excited magnons, mag- netization, and Curie temperature of (Ga;Mn)As diluted magnetic semiconductor. The equation of motion for the magnon Greens function within Tyablikov approximation is solved numerically for systems in which S is larger than 1/2