Professor Oriol Valls

CSENG Physics & Astronomy
College of Science & Engineering
Twin Cities
Project Title: 
Numerical Studies of Charge and Spin Transport in Superconductor/Ferromagnet Heterostructures

These researchers are continuing and enhancing their research program in the areas of superconducting proximity spin valves and on switching phenomena in superconductor-ferromagnet (S/F) heterostructures. The emphasis during 2020 is in the area of charge and spin transport in Josephson S/F/N/F/S ferromagnetic junctions. The researchers are studying the behavior of high quality, experimentally realistic multilayer nanostructures composed of superconducting Nb and ferromagnetic Co, such as are fabricated by the group's experimentalist collaborators at UC Irvine, where their properties are measured. The group's objective is to quantitatively predict the behavior of the fabricated structures and find the optimal configurations for switching and valve effects. 

The researchers use numerical methods they have developed to solve the exact microscopic equations for such systems. These methods have been shown to yield detailed agreement with experiment for equilibrium properties. Via transfer matrix methods, these methods are used to calculate transport properties in such a way that conservation laws are guaranteed to be satisfied. The computations require the parallel computing capabilities available at MSI.

Project Investigators

Evan Moen
Professor Oriol Valls
Chien-Te Wu
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