Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 19: POSTER Ia

MA 19.58: Poster

Dienstag, 17. März 2015, 09:30–13:00, Poster A

Tayloring granular FePt films for electrolytic gating — Karin Leistner, Kenny Duschek, Ludwig Schultz, Ludwig Reichel, Sebastian Fähler, and •Christian Kozalla — Leibniz Institute for Solid State and Materials Research, Dresden, Germany

Reversible changes of magnetism in metals are of key interest in today's research. Electric control of magnetization and anisotropy has already been achieved by electrolytic charging of continuous FePt films [1]. Here we aim for charging granular FePt films in order to study electric field effects at the superparamagnetic limit [2]. To allow for charging a granular film, a conduction path must be realized in a first step. In comparison to the well established FePt/MgO architecture we study the growth of granular L10 ordered FePt films on a Nb-doped SrTiO3 substrate. L10 ordering in this case is achieved at lower substrate temperatures. However, the conduction volume of the substrate turns out to be too large for reasonable anomalous Hall-Effect (AHE) measurement, needed for in situ magnetic characterization during charging. The AHE measurement is successful when an additional Fe layer is sputtered on granular L10 FePt. In these Fe/FePt bilayers a sufficient conduction path and at the same time single phase hard magnetic behavior can be realized. These exchange coupled films are promising candidates for future electrolytic gating experiments.

[1] K. Leistner et al. Physical Rev. B 87, 224411, (2013); doi: 10.1103/PhysRevB.87.224411

[2] F. Kurth et al. Physical Rev. B 82, 184404, (2010); doi:10.1103/PhysRevB.82.184404