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      University of Illinois at Urbana-Champaign

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Ion Moraru received his PhD in 2006 from Michigan State University in East Lansing, MI, working with Norman Birge in close collaboration with William. P. Pratt and Jack Bass. The main focus of his dissertation work was studying the proximity effect in Ferromagnet/Superconductor (F/S) hybrid systems. In particular, studies were conducted using strong ferromagnets, aimed at finding a suitable F/S system for which a new kind of spin-triplet superconducting order could be induced in a conventional superconducting material [Volkov et al. PRL 90, 117006 (2003)]. This can be accomplished by surrounding a superconductor with ferromagnets whose magnetization directions are non-collinear. Measuring the superconducting critical temperature, Tc, of F/S/F trilayer structures with parallel (P) or anti-parallel (AP) ferromagnet magnetization orientation provides a good indication for the degree to which the ferromagnets are affecting the superconductor. The spatial extent of the triplet state order parameter inside a ferromagnet goes far beyond that of the singlet state, and can be probed by various means including density of states and Josephson junction measurements.


DVH Research Group, 1996-2005
University of Illinois at Urbana-Champaign