Regensburg 2013 – scientific programme

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DF: Fachverband Dielektrische Festkörper

DF 22: Poster II

DF 22.20: Poster

Friday, March 15, 2013, 10:30–13:30, Poster D

On the micromagnetic origin of the spin-reorientation transition in Ni_xPd_1−x alloys — •Daniel Gottlob^1,2, Ingo Krug¹, Florian Nickel¹, Hatice Doganay¹, Stefan Cramm¹, and Claus M. Schneider^1,2 — ¹Peter-Gruenberg Institut 6, Forschungszentrum Juelich, 52425 — ²Fakultaet fuer Physik, Universitaet Duisburg-Essen, 47057 Duisburg

We chose the model system Ni_xPd_1−x to investigate different mechanisms involved in inverse spin-reorientation transitions (iSRTs). The 3d-4d hybridization between Ni and Pd and the strain variation by composition offer a way to tune magnetic anisotropy. Aberration-corrected LEEM-PEEM with its high spatial resolution is the ideal tool to investigate the magnetic domain-structure and do temperature- and composition-gradient dependent studies on microwedges and thin films. By alloying Paladium into Nickel the epitaxial strain of a thin film may be varied and the critical film thickness at which an iSRT occurs can be controlled. Close to the critical thickness the iSRT can also be induced by variation of the temperature. We present first results imaging the iSRT in NiPd by aberration corrected PEEM at the FZ Jülich Beamline UE56/1-sgm at BESSY. We prepared NiPd thin films in situ in a microwedged structure by molecular beam epitaxy. Both elements have been co-deposited using an aperture-shadowing technique to create a thickness wedge on the sample. On this poster we present LEEM and PEEM data mapping the wedge in terms of structural and magnetic properties.