• Title/Summary/Keyword: Ferromagnetism

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Study on Magnetic Properties of TiO2-δ:Ni Thin Films (산소 결핍된 TiO2-δ:Ni 박박의 자기적 성질 연구)

  • Park, Young-Ran;Kim, Kwang-Joo;Kim, Chul-Sung
    • Journal of the Korean Magnetics Society
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    • v.16 no.3
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    • pp.168-172
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    • 2006

  • We studied the magnetic and the related electronic properties of Ni-doped rutile $TiO_{2-{\delta}}$ films (including oxygen deficiency $\delta$) prepared using a sol-gel method. A room-temperature ferromagnetism was observed in the $TiO_{2-{\delta}}$ : Ni films with the saturation magnetization ($M_S$) decreasing with increasing Ni doping and remaining constant above 6 at% Ni doping. The observed ferromagnetism below 6 at% Ni doping is interpreted as due to magnetic polaron formed by a trapped electron in oxygen vacancy and magnetic impurity ions around it. For small Ni doping, $M_S$ up to $3.7{\mu}B/Ni$ was obtained. The ferromagnetism for Ni doping above 6 at% is interpreted as due to the existence of Ni clusters that can explain the p-n conductivity transition observed by Hall effect measurements.

  • https://doi.org/10.4283/JKMS.2006.16.3.168 인용 PDF KSCI