Berlin 2008 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

MA: Fachverband Magnetismus

MA 5: Spindependent Transportphenomena I

MA 5.10: Vortrag

Montag, 25. Februar 2008, 12:30–12:45, H 0112

Inelastic electron tunneling spectra of MgO based tunnel junctions with various soft electrode materials — •Volker Drewello, Jan Schmalhorst, Andy Thomas, and Günter Reiss — Universität Bielefeld, Germany

We have prepared MgO based magnetic tunnel junctions which show up to 180% TMR ratio at room temperature and 250% at 12 K using a commonly used CoFeB/MgO/CoFeB layer stack. Several ferromagnetic materials were also used as the soft electrode and we have measured inelastic electron tunneling spectra for each of these systems. The spectra show the typical magnon and phonon features as well as additional features which are not known from amorphous Alumina barriers. We compare the spectra with respect to the different electrode materials and compare our findings to the Alumina based junctions.