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The Synthesization of Co-doped ZnO Matrix Diluted Magnetic Semiconductors Using the Sol-gel Process

Author: JiHongFen
Tutor: ZhangZhiYong
School: Northwestern University
Course: Circuits and Systems
Keywords: Diluted magnetic semiconductors ZnO Co doping Sol - gel method . Orthogonal design
CLC: TN304
Type: Master's thesis
Year: 2008
Downloads: 394
Quote: 3
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Abstract


Dilute magnetic semiconductor material is a set of carrier spin and charge degrees of freedom in one of the new type of semiconductor material , due to its novel features of the magneto-optical , magnetic , electrical , magnetotransport , implies a huge potential applications become a research focus . Direct band gap semiconductor materials as a wide band gap ZnO become possible to achieve room temperature ferromagnetism in dilute magnetic semiconductor substrate material for its excellent physical and chemical properties . Moreover, the theory predicts that the Co doped ZnO can be realized ferromagnetism above room temperature . This article using the sol - gel powder materials prepared by the Co -doped ZnO-based diluted magnetic semiconductors (DMSs) , the ferromagnetism . By the the orthogonal experimental program , and the single-factor experimental program more systematic study of the preparation conditions of the sample structure and magnetic properties . Means of XRD and VSM test can be carried out to characterize the structure , composition and magnetic properties of the samples . Experimental results show that , the Co doping did not change the ZnO and wurtzite type crystal structure, but the increase in the amount of Co doped to reduce the crystalline quality of the sample . Rapid annealing process is conducive to the samples have ferromagnetic properties at room temperature . Sample magnetic test results as well as analysis of the ferromagnetic properties of cobalt and cobalt oxide , and that the observed ferromagnetism is the nature of the sample itself , and not from the second phase of the sample . Double - exchange mechanism application carrier regulated preliminary analysis of the ferromagnetic sample , and under different conditions the differences between the samples ferromagnetic made ??a reasonable explanation and prediction .

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