October 14, 2025 Thesis Open Access

GIZACHEW DIGA

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  <dc:creator>GIZACHEW DIGA</dc:creator>
  <dc:date>2025-10-14</dc:date>
  <dc:description>Abstract Ferromagnetism in II-VI diluted magnetic semiconductor, Zn1−xMnxO is studied. The magnetic behavior of this DMS is studied by using the Heisenberg and the Green’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−xMnxO is detected by theoretical calculation of magnetic quantities by using the Green’s theorem. Ferromagnetic resonance studies also reveal that Zn1−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.</dc:description>
  <dc:identifier>https://zenodo.org/record/19874</dc:identifier>
  <dc:identifier>10.20372/nadre:19874</dc:identifier>
  <dc:identifier>oai:zenodo.org:19874</dc:identifier>
  <dc:language>eng</dc:language>
  <dc:relation>doi:10.20372/nadre:19873</dc:relation>
  <dc:relation>url:https://nadre.ethernet.edu.et/communities/005</dc:relation>
  <dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
  <dc:rights>http://www.opendefinition.org/licenses/cc-by</dc:rights>
  <dc:subject>Diluted magnetic semiconductors, ferromagnetism, Curie temperature, wurtzite structure, ferromagnetic resonance, nanoparticles, magneto transport, giant magneto-resistance, Hall coefficient.</dc:subject>
  <dc:title>THE STUDY OF FERROMAGNETISM IN II-VI DILUTED MAGNETIC SEMICONDUCTORS, Zn1-xMnxO</dc:title>
  <dc:type>info:eu-repo/semantics/doctoralThesis</dc:type>
  <dc:type>publication-thesis</dc:type>
</oai_dc:dc>