By: Gizachew Diga Milki
Associate Professor, Department of Physics, Jimma University, Ethiopia
Ferromagnetism in II-VI diluted magnetic semiconductor, Zn1-xMnxO is studied. The magnetic behavior of this Diluted Magnetic Semiconductor (DMS) is determined by using the Heisenberg and the Green’s formalism. Heisenberg’s Model describes the Hamiltonian of the system in terms of spin density and excitons. In the same way, Green’s theorem is used for calculating magnetic quantities. These theorems are employed to estimate the origin of ferromagnetism in Zn1-xMnxO nanostructures. For spin- spin interactions mediated by carriers, ferromagnetic ordering occurs if the mean distance between Mn-Mn ions is sufficiently less than electron wavelength. The result is compared with experimental values and tested for Mn concentrations greater than 4%. In addition, the stability conditions are stated in terms of giant magneto resistance. Green’s theorem employed enables us to estimate the origin of ferromagnetism and resulting shift in magnetic phases. A calculation of magnetic susceptibility is carried out to verify the existence of ferromagnetism at Curie temperature. The search for the existence of ferromagnetic hysteresis and superparamanetism in Zn1-xMnxO nanoparticles enable us to spot its multifunction. Besides, medical and electronic applications of Zn1-xMnxO is reviewed.
Keywords: Curie temperature, diluted magnetic semiconductors, ferromagnetism, hysteresis curve, magnetic susceptibility, magneto resistance, nanoparticles
Citation:
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