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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 10: Multiferroics and Magnetoelectric Coupling II (joint session MA/KFM)
KFM 10.7: Vortrag
Mittwoch, 18. März 2020, 16:30–16:45, HSZ 401
Voltage-controlled on switching and manipulation of magnetization via redox transformation of beta-FeOOH nanoplatelets — •Martin Nichterwitz1,2, Sabine Neitsch1, Stefan Röher1, Daniel Wolf1, Kornelius Nielsch1,2, and Karin Leistner1 — 1IFW Dresden, Germany — 2TU Dresden, Germany
Voltage control of magnetism by ionic approaches, such as the metal/metal oxide transformation in gated architectures, presents a promising pathway to low-power magnetic devices or magnetic actuation. Such magneto-ionic manipulation has been reported mainly for ultrathin films and nanoporous metal alloy structures so far.
We investigate electrodeposited porous beta-FeOOH nanoplatelets as starting material, known as active material from catalysis research. The FeOOH is polarized in 1M LiOH solution at room temperature. The voltage-induced structural and morphological changes are probed and correlated to the magnetic changes measured in an in situ anomalous Hall effect setup. This approach, starting from paramagnetic FeOOH, enables complete and non-volatile ON switching of ferromagnetic layers at a low voltage and large reversible magneto-ionic effects.[1] During the first reduction step, we transform FeOOH into a rough granular Fe layer. This high surface Fe layer is then switched reversibly via a redox transformation. As a result, large voltage-induced changes in magnetization are achieved, which exceed those obtained for sputtered Fe films and Fe nanoislands.[2]
[1] Nichterwitz et al., J. Phys. D (2019), accepted;
[2] Duschek et al., J. Mater. Chm. C 6 (2018) 8411