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dc.contributor.advisorZhang, Shufeng, 1963-eng
dc.contributor.authorYang, Zhaoyang, 1980-eng
dc.date.issued2007eng
dc.date.submitted2007 Falleng
dc.descriptionThe entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file.eng
dc.descriptionTitle from title screen of research.pdf file (viewed on March 4, 2008)eng
dc.descriptionIncludes bibliographical references.eng
dc.descriptionVita.eng
dc.descriptionThesis (Ph. D.) University of Missouri-Columbia 2007.eng
dc.descriptionDissertations, Academic -- University of Missouri--Columbia -- Physics.eng
dc.description.abstractSpin angular momentum transfer, or spin transfer, is a short notion of the transfer of spin angular momentum between the spin polarized current and the magnetization of ferromagnetic condensates. Spin transfer effect in ferromagnetic nanostructures, such as Magnetic Tunnel Junctions (MTJ) and Spin Valves, is studied in this dissertation. Spin current generates spin transfer torque in ferromagnets, which can induce magnetization reversal, spin wave emission, as well as self-sustained magnetization precession in the presence of magnetic field.The magnetization oscillation in spin valves is referred as the spin transfer oscillator (STO). We investigated the magnetization dynamics in STO. We applied a universal method, Melnikov Integral, to determine three different dynamical phases in STO, that is, limit cycles, synchronization and chaos. Finite temperature may have significant effect on STO dynamics. We studied the thermal effect on limit cycles and chaos. In MTJ, in addition to spin transfer, energy transfer effect is studied on the basis of energy conservation. The effect of energy transfer on spin transfer induced magnetization switching is modeled in terms of an effective magnetic temperature.eng
dc.identifier.merlinb62412310eng
dc.identifier.oclc212783009eng
dc.identifier.urihttp://hdl.handle.net/10355/4719eng
dc.languageEnglisheng
dc.publisherUniversity of Missouri--Columbiaeng
dc.relation.ispartofcollectionUniversity of Missouri--Columbia. Graduate School. Theses and Dissertationseng
dc.subject.lcshAngular momentumeng
dc.subject.lcshFerromagnetic materialseng
dc.subject.lcshSpin eigenfunctionseng
dc.titleSpin angular momentum transfer in magnetic nanostructureeng
dc.typeThesiseng
thesis.degree.disciplinePhysics (MU)eng
thesis.degree.grantorUniversity of Missouri--Columbiaeng
thesis.degree.levelDoctoraleng
thesis.degree.namePh. D.eng


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