Berlin 2018 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 12: Multiferroics and magnetoelectrics II (joint session MA/KFM)

KFM 12.1: Vortrag

Mittwoch, 14. März 2018, 09:30–09:45, EB 202

Magneto-ionic ON/OFF switching of magnetization in FeOx/Fe nanostructures — •Jonas Zehner, Kenny Duschek, Nicolas Peréz, Andreas Petr, Rudolph Schäfer, Kornelius Nielsch, and Karin Leistner — IFW Dresden

A novel route towards low-power voltage-control of magnetism was recently discovered by utilizing voltage-induced ion migration and electrochemical oxidation/reduction in oxide/metal films and denominated magneto-ionic effect [1,2,3]. In all-solid architecture, significant magneto-ionic effects are achieved at elevated temperatures when ion migration is thermally activated. Instead, we present large voltage-induced magnetic changes within several nanometers of FeOx/Fe films at room temperature. The voltage is applied via a liquid alkaline electrolyte [4] (KOH or LiOH solution), which, in comparison to solid oxide gate barrier layers, yields an enhanced electric field and a higher ion mobility at the electrode surface. Nearly complete and reversible voltage-induced ON/OFF switching of magnetization (up to 90 %) is observed in granular FeOx/Fe thin films for a voltage change of 1 V, proven by in situ AHE and in situ FMR. An in situ Kerr microscope set-up has been developed that resolves magnetic domains through a liquid alkaline electrolyte. Thereby, for the first time, the study of the local impact of electrochemical reactions on the magnetic domain characteristics becomes possible for solid/liquid magneto-ionic systems. [1] Song et al., Prog. Mater Sci. 87, 33, 2017, [2] Leistner et al., Phys.Rev. B 87, 224411, 2013, [3] Bauer et al., Nat. Mater. 14, 174, 2015, [4] Duschek et al., APL Mater. 4, 032301, 2016