Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 20: Multiferroics and Magnetoelectric coupling I (joint session MA/KFM)
MA 20.3: Vortrag
Dienstag, 2. April 2019, 14:45–15:00, H37
Magnetoelectric Red-Ox switching of magnetism in iron oxide/iron nanostructures — •Jonas Zehner1,2, Ivan Soldatov1, Rudolf Schäfer1, Sebastian Fähler1, Kornelius Nielsch1,2, and Karin Leistner1,2 — 1IFW Dresden — 2TU Dresden - Institute of Material Science
Low power voltage-control of magnetism in metals can be achieved by electrical gating of magnetic nanostructures. Recent approaches focus on ion displacement and electrochemical reactions in oxide/metal films[1,2]. All solid state architectures suffer from a low ion mobility at room temperature (RT) and focus on ultrathin films so far[3]. Utilizing liquid electrolytes allows us to overcome these limitations and achieve large voltage induced changes of magnetization and anisotropy within several nanometer thick oxide/metal heterostructures[4]. In this case, typical alkaline battery electrolytes are used and merely 1V is applied to induce electrochemical RedOx processes in nanostructured FeOx/Fe films[4,5]. For FeOx/Fe nanoislands, ON/OFF switching of magnetization has been probed by two independent integral methods: in situ AHE and in situ FMR. A novel in situ Kerr set up has been developed, which allows us to observe also local changes of the magnetic microstructure during the RedOx operations. We find, for the first time, significant voltage-induced changes of the domain size in continuous FeOx/Fe thin films upon RedOx reactions. [1]Song et al., Prog. Mater Sci. 87, 33,2017, [2]Leistner et al., PRB 87, 224411,2013, [3]Bauer et al., Nat. Mater. 14, 174,2015, [4]Duschek et al. APL Mater.4, 32301,2016 [5]Duschek et al., J. Mater. Chem. C 6, 8411,2018