Magneto-Optical Properties of ZnO:Co Nanocrystalline Films

다국어 초록 (Multilingual Abstract)

Co doped ZnO lms were synthesized from the precursors Zn(CH3COO)2.2H2O and Co(CH3COO)2.4H2O by using a \High Voltage Spray Pyrolysis" technique. The physical prop- erties of the prepared lms were characterized by using scanning electron microscopy (SEM), X-ray diraction (XRD) and physical property mesurement system (PPMS) measurements. The lms studied were of a wurtzite phase with grain sizes of about 20 nm. The 5 % Co-doped ZnO lms exhibited ferromagnetic behavior at room temperature. The transmission and the optical magnetic circular dichroism (MCD) measurements conrmed that Co2+ was located at the tetrahedral sites of the ZnO wurtzite structure. MCD results showed that the observed ferromagnetism was less likely related to a carrier-induced mechanism.

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