Dresden 2014 – scientific programme

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MA: Fachverband Magnetismus

MA 55: Poster II

MA 55.53: Poster

Friday, April 4, 2014, 10:30–13:30, P2

Electron holography on ripple-shaped magnetic permalloy thin films — •Falk Röder¹, Michael Körner^2,3, Monika Fritzsche^2,3, Kilian Lenz², Jürgen Lindner², Jürgen Fassbender^2,3, and Hannes Lichte¹ — ¹Triebenberg Laboratory, Institute of Structure Physics, Technical University of Dresden, 01062 Dresden, Germany — ²Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Bautzner Landstr. 400, 01328 Dresden, Germany — ³Technical University of Dresden, 01062 Dresden, Germany

By means of off-axis electron holography, we study the distribution of the magnetic induction within and around a poly-crystalline permalloy (Ni₈₁Fe₁₉) thin film. Its deposition on a silicon substrate with a given periodic surface morphology emerging through concerted Xe⁺ ion beam erosion introduces a ripple shape to the permalloy thin film. The created ripple morphology is expected to modify the magnetization distribution within the permalloy and to induce dipolar stray fields. Micro-magnetic simulations estimate those stray fields in the order of only 10 mT. Consequently, their experimental determination at nanometer spatial resolution is highly demanding and requires advanced acquisition and reconstruction techniques such as electron holography. The reconstructed magnetic phase images show magnetized thin films, in which the magnetization direction follows the given morphology. Furthermore, a closer look to the permalloy/carbon interface reveals stray fields at the detection limit of the method in the order of 10 mT, which agrees well with micro-magnetic simulations.