October 14, 2025 Thesis Open Access

GIZACHEW DIGA

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    <subfield code="a">Diluted magnetic semiconductors, ferromagnetism, Curie temperature, wurtzite structure, ferromagnetic resonance, nanoparticles, magneto transport, giant magneto-resistance, Hall coefficient.</subfield>
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    <subfield code="a">THE STUDY OF FERROMAGNETISM IN II-VI DILUTED MAGNETIC SEMICONDUCTORS, Zn1-xMnxO</subfield>
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    <subfield code="a">&lt;p&gt;Abstract Ferromagnetism in II-VI diluted magnetic semiconductor, Zn1&amp;minus;xMnxO is studied. The magnetic behavior of this DMS is studied by using the Heisenberg and the Green&amp;rsquo;s formalism. The observed ferromagnetism is due to sp - d exchange interactions (RKKY), point defects such as oxygen vacancies, and Zn interstitial. It was also observed that with increasing Mn concentrations up to 4%, the Curie temperature increases and stable ferromagnetic ordering is observed. However, experimenters had found that for Mn concentrations higher than 4% a shift from ferromagnetic to paramagnetic behavior is noticed. This shift is due to the formation of secondary phases in excess of Mn concentrations. The Ferromagnetic behavior of Zn1&amp;minus;xMnxO is detected by theoretical calculation of magnetic quantities by using the Green&amp;rsquo;s theorem. Ferromagnetic resonance studies also reveal that Zn1&amp;minus;xMnxO nanoparticles exhibit ferromagnetic behavior. The difference in the ferromagnetic properties of the Mn-doped ZnO nanoparticles is primarily attributed to the Mn2+ content. Moreover, magneto-transport properties such as giant magneto resistance and Hall Effect coefficient measurement are found as an additional evidence for the ferromagnetic behaviors of Zn1-xMnxO.&lt;/p&gt;</subfield>
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