The Study Of Magnetism In Manganese Doped Cadmium Selenide (Cd1−Xmnxse) Diluted Magnetic Semiconductor

Abstract

Effect of temperature and dopant concentration on magnetic properties of manganese doped diluted magnetic semiconductor (Cd1−xMnxSe) was investigated theoretically by making use of the equation of motion approach of the Green’s function formalism. Heisenberg type model Hamiltonian was developed and solved. Theoretical expressions which relate magnon number, magnon heat capacity, magnetization of the system and Curie temperature with temperature and concentration (x = 0.05, x = 0.06, x = 0.07) were derived from the obtained Green’s function. The obtained results revealed the rise in magnon number and their heat capacity with respect to temperature. However, these parameters were observed to be supressed by increasing concentration of the dopant atom. Magnetization of the system was observed to decrease with increasing temperature. We also observed that increasing the dopant concentration the enhances magnetization and hence the ferromagnetic critical temperature. vi