Nano-sized Co doping ZnO magnetic semiconductors, fabrication and dielectric properties

• Main Authors: Tsai-Jung WU, 吳采蓉
• Other Authors: Chao-Ming FU
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/75340394403294130412

碩士 === 國立高雄師範大學 === 物理學系 === 93 === This thesis is about manufacturing magnetic semiconductor material of Zn1-xCoxO by Solid-state sintering , and controlling the oxygen content in process. Diluted magnetic semiconductor（ DMS）, is the material which mixes very few transitional metal atoms, and can show magnetic property in semiconductor material. To increase the proposal in usage, diluted magnetic semiconductor is combined with semiconductor property and magnetic, as well as of electron spin and electron charge. It is a new and original semiconductor material. In this thesis, we manufactured different proportional Zn1-xCoxO, and did several analysis of samples by X-ray diffraction(XRD), Vibrating Sample Magnetometer（VSM), and LCR meter. Besides, we also did analyze to its impedance spectra by using equivalent circuit analysis .The experimental result slows that the structural formation of Zn1-xCoxO is based on ZnO(wurzite). The magnetic properties, such as saturation magnetization, cociverty, etc, were measured by Vibrating Sample Measurement (VSM). The experimental M-H curve of the Zn1-xCoxO, for x<0.05, have demonstrated hysterisis behavior typical for ferromagnetism . The impedance and dielectric behaviors are also studied to explore the mechanisms underlying for high frequency transport properties essential to device applications. The equivalent circuit method composed of resistance and capacitance is ultrized to separate the microscopic dielectric relaxation. This thesis reports the sol-gel method and solid state sintering method can manufacture nano sized sample of ZnO doped Co. Furthermore, the sample we synthesized are ferromagnetic. The results of the thesis also provided a base of spintronics device.