Berlin 2008 – wissenschaftliches Programm

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SYNF: Symposium Ferroic materials and novel functionalities

SYNF 1: Ferroic materials and novel functionalities I

SYNF 1.9: Vortrag

Dienstag, 26. Februar 2008, 12:30–12:45, A 151

All-electron calculations of electronic tunneling in perovskite magnetic tunnel junctions — •Daniel Wortmann and Stefan Blügel — Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich, Germany

Combining materials with different ferroic orders into a single multilayer transport junction offers the prospect of novel devices like 4-bit memory cells or switching schemes based on the coupling between the different ferroic configurations. However, the materials used in such junctions often exhibit extremely complex interrelations between details of their atomic, electronic and magnetic structure making the simulation of such multilayer junctions on an ab initio level a necessity for any realistic setup but a true challenge at the same time. We will present calculations using our all-electron, full-potential transport code [1] based on the embedding Green function method. For the model setup of a SrRuO₃/SrTiO₃/SrRuO₃ tunneljunction we calculate the spin-polarized electronic tunnel-current and investigate the effects of lattice distortions on the orbital character of the current carrying Bloch states in SrRuO₃ and the resulting changes on the spin-polarization of the current.

[1] D. Wortmann, H. Ishida, and S. Blügel, Phys. Rev. B 66, 075113 (2002).