Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/28305
Title: The structural and magnetization studies of Transition Metal-doped ZnO thin films.
Authors: YONG ZHIHUA
Keywords: dilute magnetic semiconductor , Zinc oxide, synchrotron radiation studies, X-ray absorption fine structure, ferromagnetic
Issue Date: 3-May-2009
Source: YONG ZHIHUA (2009-05-03). The structural and magnetization studies of Transition Metal-doped ZnO thin films.. ScholarBank@NUS Repository.
Abstract: A dilute magnetic semiconductor (DMS) is a material in which a fraction of the host cations are substitutionally replaced by magnetic ions or appropriate rare earths. This leads to localized magnetic moments in the semiconductor matrix. DMS is regarded as the key materials for spin electronics where not only charge but also spin of electrons are used for electronic functionality. Ferromagnetic semiconductors with Curie temperatures (TC) above room temperature are ideal for more efficient spintronics devices, and high TC ferromagnetic properties in DMS have been reported. However, the origin of room temperature ferromagnetism in DMS is still controversial. Four common possible origins of ferromagnetism in DMS have been proposed and this thesis aims to examine their feasibility.Zinc oxide (ZnO) is well known for its direct band-gap and large excitation energy, and exhibits unique piezoelectric and electric-optic properties. In particular, ZnO has been identified as a good host material for realizing wide band-gap DMS with high TC ferromagnetism by doping with magnetic ions.In this project, Zn1-xTMxO (TM-Co, Cu, Ti and Mn) films were fabricated on Si (100) substrates by radio-frequency magnetron sputtering. Profilometry measurements, scanning electron microscopy (SEM), X-ray fluorescence (XRF), X-ray diffraction (XRD), X-ray absorption fine structure studies (XAFS) and vibrating sample magnetometer (VSM) measurements were used to characterize the samples and investigate the origins of magnetism.
URI: http://scholarbank.nus.edu.sg/handle/10635/28305
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