Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 10: Spin-dependent Transport Phenomena

MA 10.9: Vortrag

Montag, 31. März 2014, 17:15–17:30, HSZ 403

Spin transport and magnetoresitance in metal | phthalocyanine | metal vertical heterostructures investigated by first principle methods — •Hahn Torsten — Institute for Theoretical Physics, TU Freiberg, D-09596 Freiberg

Based on density functional theory electronic structure calculations we used the nonequilibrium Green's function formalism (NEGF) to study finite bias quantum transport in metal | metal-phthalocyanine | metal heterostructures. The investigated structures model phthalocyanine layers sandwiched between two semi-infinite metal electrodes. We study the quantum transport and thus the magnetoresitance of such devices as a function of the applied bias voltage. By varying the type of the Phthalocyanine in the junction we show that one can tune the magnitude of the magnetoresistance. Furthermore we can show that even with the strong coupling between Phthalocyanine and metal electrodes it is possible to reach reasonable magnetoresistance values which could make those molecules suitable for prototypical spin-transport based devices.