The role of carbon dopants in room temperature ferromagnetism ZnO

• Main Authors: Yi Tung, 董弈
• Other Authors: H. S. Hsu
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/43947462763308458014

碩士 === 國立屏東教育大學 === 應用物理系 === 99 === We investigated the role of carbon(C) of room temperature (RT) ferromagnetic C:ZnO films. The RT ferromagnetism can be observed in air-annealed C:ZnO sample. But we didn’t observe any feature that could be attributed to carbons incorporated at O sites in our cases. The sample shows an anhysteretic magnetization curve which could be considered as a characteristic of defect-mediated ferromagnetism. From the analysis on MCD spectra of the ferromagnetic C:ZnO sample, we found that its MCD structure is composed of non-ferromagnetic broad peak and ferromagnetic narrow peak. We suggest even if the C dopants are not at Co sites, C is still a novel dopant to control the defect structure by suitable post-annealing for the magnetic properties of ZnO DMS.