The Study of Ferromagnetism in Diluted Magnetic Semiconductor Hg1−xMnxTe

Abstract

In this thesis, we studied the effect of temperature and concentration of dopant magnetic impurity on magnetic properties of Hg1−xMnxTe. We have defined a model Hamiltonian which represents the interaction of magnons in the system and solved it using the equation of motion approach of Green’s function formalism. Based on the Green’s function obtained we have derived theoretical expressions which relate magnetic properties of the system on dopant concentration (x = 0.1, x = 0.2, x = 0.3) and temperature. The obtained theoretical relations were plotted and discussed accordingly. From the plots we observed increase in magnon density and and magnetic susceptibility as temperature of the system increases. More over, we observed the suppression of magnon number density as dopant concentration increases. Besides, we observed increase in magnon density and Curie temperature of the system as the dopant concentration increases.