October 14, 2025 Thesis Open Access

GIZACHEW DIGA

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{
  "DOI": "10.20372/nadre:19874", 
  "language": "eng", 
  "title": "THE STUDY OF FERROMAGNETISM IN II-VI DILUTED MAGNETIC SEMICONDUCTORS, Zn1-xMnxO", 
  "issued": {
    "date-parts": [
      [
        2025, 
        10, 
        14
      ]
    ]
  }, 
  "abstract": "<p>Abstract Ferromagnetism in II-VI diluted magnetic semiconductor, Zn1&minus;xMnxO is studied. The magnetic behavior of this DMS is studied by using the Heisenberg and the Green&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&minus;xMnxO is detected by theoretical calculation of magnetic quantities by using the Green&rsquo;s theorem. Ferromagnetic resonance studies also reveal that Zn1&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.</p>", 
  "author": [
    {
      "family": "GIZACHEW DIGA"
    }
  ], 
  "version": "Version 1", 
  "type": "thesis", 
  "id": "19874"
}