Sahele, Asnake2018-06-192023-11-092018-06-192023-11-092011-06http://10.90.10.223:4000/handle/123456789/1517(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 1/2enSemiconductors (Ga,Mn)AsThesis