Dresden 2006 – scientific programme

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MA: Magnetismus

MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)

MA 20.31: Poster

Tuesday, March 28, 2006, 15:15–19:15, P1

Structural and Local Magnetic Characterization of Fe/MgO and MgO/Fe Interfaces — •Ellen Schuster and Werner Keune — Angewandte Physik, Uni Duisburg-Essen, Duisburg

An epitaxial sandwich system of Fe/MgO/Fe is a simple realization of a tunnel junction with high tunneling magnetoresistance. The structure of the tunnelbarrier and specially the magnetism at the interfaces of MgO/Fe and Fe/MgO are of great importance to achieve spin conservation during spin dependent tunneling. We report on the structural and magnetic properties of the two different interfaces. The samples have been epitaxially grown in an MBE chamber and the structural characterization was carried out using RHEED and XRD. For the magnetic properties two monolayers of 57Fe have been deposited directly at either interface. This 57Fe tracer layer was investigated by conversion electron Mössbauer spectroscopy (CEMS) to determine the magnetic properties at the interfaces. We observe an enhancement of the interfacial hyperfine magnetic field, which is different for both types of interfaces.(Supported by DFG (SFB491))