Diluted magnetic semiconductor Ferromagnetism Optical magnetic circular dichroism
Issue Date:
2008
Publisher:
Journal of the Korean Physical Society
Citation:
Volume 52, Issue 5, Page 1621-1624
Abstract:
Co doped ZnO films were synthesized from the precursors Zn(CH 3COO)2.2H2O and Co(CH3COO) 2.4H2O by using a "High Voltage Spray Pyrolysis" technique. The physical properties of the prepared films were characterized by using scanning electron microscopy (SEM), X-ray diffraction (XRD) and physical property mesurement system (PPMS) measurements. The films studied were of a wurtzite phase with grain sizes of about 20 nm. The 5 % Co-doped ZnO films exhibited ferromagnetic behavior at room temperature. The transmission and the optical magnetic circular dichroism (MCD) measurements confirmed that Co 2+ 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.
