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dc.contributor.advisorChairperson, Graduate Committee: Yves U. Idzerdaen
dc.contributor.authorLussier, Alexandre Francoisen
dc.date.accessioned2013-06-25T18:37:13Z
dc.date.available2013-06-25T18:37:13Z
dc.date.issued2005en
dc.identifier.urihttps://scholarworks.montana.edu/xmlui/handle/1/1764en
dc.description.abstractSemiconductor spintronics is a promising new field of study in the ongoing quest to make electronic devices faster, cheaper, and more efficient. While current spintronics utilizes the spin property of electrons to achieve greater functionality, the integration of spintronics into conventional semiconductor electronics will lead to advances in opto-electronics, quantum computing, and other emerging fields of technology. This integration relies on effective generation, injection, transport, and detection of spin polarized electron currents. To these ends, the successful synthesis of room temperature ferromagnetic semiconductors is mandatory. In this work, we study the properties of cobalt-doped titanium dioxide, a room temperature dilute ferromagnetic semiconductor discovered in 2001. We characterize the Pulsed Laser Deposition (PLD) of Co-doped TiO2 thin films, including the substrate-induced stabilization of the anatase structure of TiO2. We also confirm the substitutional nature of cobalt on titanium sites by X-ray Absorption Spectroscopy (XAS) techniques. The ferromagnetic interaction mechanism remains controversial. Yet, we provide experimental evidence for the polaron mediated ferromagnetic coupling mechanism recently suggested to mediate ferromagnetic interactions in this, and other magnetically doped oxides, in the dilute regime (approximately 0 to 3%). Our evidence is related to a previously unobserved and unreported XAS spectral feature. Finally, we demonstrate the surprising absence of an X-ray Magnetic Circular Dichroism (XMCD) signature at the cobalt L edge.en
dc.language.isoenen
dc.publisherMontana State University - Bozeman, College of Letters & Scienceen
dc.subject.lcshFerromagnetism.en
dc.subject.lcshTitanium dioxide.en
dc.titleFerromagnetism in cobalt-doped titanium dioxideen
dc.typeDissertationen
dc.rights.holderCopyright 2005 by Alexandre Francois Lussieren
thesis.catalog.ckey1175073en
thesis.degree.committeemembersMembers, Graduate Committee: Rufus Cone; Richard Smith; Recep Avcien
thesis.degree.departmentPhysics.en
thesis.degree.genreDissertationen
thesis.degree.namePhDen
thesis.format.extentfirstpage1en
thesis.format.extentlastpage84en


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