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dc.contributor.authorAnaya, Armando Alonsoen_US
dc.date.accessioned2005-07-28T17:54:24Z
dc.date.available2005-07-28T17:54:24Z
dc.date.issued2005-03-30en_US
dc.identifier.urihttp://hdl.handle.net/1853/6864
dc.description.abstractThis thesis describes a research of suppression of superconducting gap in a superconducting island of a Ferromagnetic-Superconducting-Ferromagnetic Single-Electron-Transistor due to the fringing magnetic fields produced by the ferromagnetic leads. The devices are working below the critical temperature of the superconducting gap. A model is proposed to explain how the fringing magnetic field produced by the leads is strong enough to suppress the superconducting gap. The peak of the fringing magnetic field produced by one lead reaches 5000 oe. It is observed an inverse tunneling magneto resistance during the suppression of the superconducting gap, obtaining a maximum absolute value 500 times greater than the TMR in the normal state where the efficiency of the spin injection is low. It is concluded that the suppression of the superconducting gap is due to fringing magnetic field and not to the spin accumulation because the low efficiency of the spin injection. It is suggested a new geometry to reduce the effect of the fringing magnetic field so it can be obtained a suppression of the superconductivity due to the spin accumulation. It is described the qualitatively behavior of the IV characteristic when the suppression of the superconductivity is due to spin accumulation.en_US
dc.format.extent2243938 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoen_US
dc.publisherGeorgia Institute of Technologyen_US
dc.subjectMagnetoresistanceen_US
dc.subjectNanotechnology
dc.subjectSingle electron transitor
dc.subjectSpintronics
dc.subject.lcshSuperconductors Magnetic propertiesen_US
dc.subject.lcshSpintronicsen_US
dc.subject.lcshFerromagnetic materialsen_US
dc.subject.lcshEnergy gap (Physics)en_US
dc.titleSpin Valve Effect in Ferromagnet-Superconductor-Ferromagnet Single Electron Transistoren_US
dc.typeDissertationen_US
dc.description.degreePh.D.en_US
dc.contributor.departmentPhysicsen_US
dc.description.advisorCommittee Member: Davidovic, Dragomir; Committee Member: De Heer, Walter; Committee Member: Ferguson, Ian; Committee Member: First, Phillip; Committee Member: Sa De Melo, Carlosen_US


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