Dresden 2017 – scientific programme
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MA: Fachverband Magnetismus
MA 67: Poster 4
MA 67.11: Poster
Friday, March 24, 2017, 09:30–13:00, P2-OG3
Magnetic domains in FePt thin films for magneto-ionic effects — •Jonas Zehner1, Sebastian Fähler1, Rudolf Schäfer1, Christine Damm1, Liu Yang1,2, Kornelius Nielsch1, and Karin Leistner1 — 1Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, Deutschland — 2Technische Universität Dresden, Deutschland
The manipulation of the magnetic properties by an external electric instead of magnetic field is highly interesting from a fundamental and technological point of view. Recently, large reversible voltage-induced changes of interfacial magnetism have been achieved by exploiting electrochemical reactions and denominated magneto-ionic effect [1, 2]. These results indicate that magneto-ionic changes of the magnetic microstructure are possible.
We investigate FePt thin films with regard to the evolution of a magnetic microstructure suitable for the observation of magneto-ionic effects. FePt films (4 nm) were pulsed laser deposited and L10 ordering achieved. Magnetic domain observation by Kerr microscopy revealed two fundamentally different domain characteristics. Large non equilibrium domains are observed in FePt films with increased anisotropy. In contrast, stable bubble like domains are found in the films with lower anisotropy.
First approaches towards electrochemical in situ Kerr microscopy were achieved on FePt thin films. Results showed electrochemical functionality and the possibility of magnetic domain observation through a transparent counter electrode and an electrolyte.