CAO Ping, BAI Yue, ZHAO Dong-xu, SHEN De-zhen. Structural and Ferromagnetism Properties of NH<sub>3</sub> Plasma Post-treated Co-doped ZnO Thin Film[J]. Chinese Journal of Luminescence, 2011,32(4): 383-386
CAO Ping, BAI Yue, ZHAO Dong-xu, SHEN De-zhen. Structural and Ferromagnetism Properties of NH<sub>3</sub> Plasma Post-treated Co-doped ZnO Thin Film[J]. Chinese Journal of Luminescence, 2011,32(4): 383-386 DOI: 10.3788/fgxb20113204.0383.
Structural and Ferromagnetism Properties of NH3 Plasma Post-treated Co-doped ZnO Thin Film
The Co-doped ZnO film was grown by electrodeposition method
the carrier concentration is 10
17
cm
-3
but the sample is paramagnetism. The electrons can not induce the room temperature ferromagnetism
only the introducing of additional carriers can enhance the ferromagnetic exchange action and induce the room temperature ferromagnetism. Nitrogen-doped ZnCoO film was obtained in plasma-enhanced chemical vapor deposition system
where NH
3
plasma provided N source. After an ammine plasma treatment the room tempe-rature ferromagnetism was detected on ZnCoO sample. So some holes generated by N doping play an important role for the room temperature ferromagnetic properties in Co doped ZnO sample.In our experiments
although the sample still is n-type semiconductor
there are some holes in the crystal generated by plasma treatment. In this theory
a bound magnetic polarons (BMPs) could be formed after the introduction of p-type dopant N.
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references
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