First-Principles Studies of Electronic Structure and Magnetic Properties of 3d Metal-doped SnO2
Date Issued
2005
Date
2005
Author(s)
Wu, Chien-Te
DOI
en-US
Abstract
The discovery of the ferromagnetic semiconductor has stimulated a great deal of interests in the origin or its ferromagnetism because of its potential applications in the spintronics, a rapidly developing research area, in which the electron spin play an important role in addition to the usual charge degree of freedom. Semiconductor devices generally take advantage of the charge of electrons, whereas magnetic materials are used for recording information involving electron spin. SnO2 exhibits interesting electrical and optical properties and is widely used as a transparent conductor. More recently, Ogale et al. found that the thin films of Sn1−xCoxO2− (x < 0.3) not only exhibit ferromagnetism with a Curie temperature close to 650 K, but also a giant magnetic moment of (7.5±0.5) µB/Co, which is much larger than the value for small Co clusters ( 2.1µB/Co). Thus we have investigated electronic structures of 3d-metal doped rutile SnO2 (Mn, Fe, Co, and Ni) by first principle calculations. And we found the Co, Fe, and Mn-doped SnO2 indeed exhibit ferromagnetic properties, while Ni-doped cases are non magnetic. I hope these theoretical studies are helpful for the development of spintronic and DMS system to improve the humanity life.
Subjects
半導體
二氧化錫
semiconductor
tin dioxide
Type
thesis
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