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Spin-Polarized Non-Local Transport in Hybrid Structures with Magnetic and Superconducting Correlations

Stige, Kristoffer
Master thesis
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565891_FULLTEXT01.pdf (1.032Mb)
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http://hdl.handle.net/11250/246734
Utgivelsesdato
2012
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  • Institutt for fysikk [2164]
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In this thesis we theoretically examine spin-polarized non-local transport in two junctions built up by materials with superconducting and magnetic properties. The first consists of a Zeeman-split superconductor placed between two normal metals. We find that such systems can generate a spin-polarized non-local current even when the injected current is unpolarized. The effect is however mostly geometric and take place also when the superconductor is switched with a normal metal. The second system is built up by two ferromagnetic wires coupled by a superconductor via spin-active interfaces. We investigate the circumstances which allow for an inverse spin-valve effect. For certain parameter ranges we find that a crossover between positive and negative magnetoresistance is possible as a function of temperature.
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