Berlin 2024 – scientific programme
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MA: Fachverband Magnetismus
MA 13: Micro- and Nanostructured Magnetic Materials
MA 13.1: Talk
Monday, March 18, 2024, 15:00–15:15, EB 407
Magneto-ionic Control of Magnetoresistance in FeOx/Fe/Au Aerogels Networks — •Martin Nichterwitz1,2, Karl Hiekel3, Daniel Wolf2, Alexander Eychmüller3, and Karin Leistner1,2 — 1TU Chemnitz, Germany — 2IFW Dresden, Germany — 3TU 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. Magneto-ionic (MI) manipulation has been reported mainly for thin films and nanoporous metal alloy structures so far, whereas 3D nanostructures are exciting from fundamental and application point of view.[1] A seldom investigated magnetic feature in MI is magnetoresistance (MR), that is often examined in film geometry. We demonstrate reversible MI ON-OFF switching of MR in 3D FeOx/Fe/Au aerogel networks.[2] Multi-layered Au aerogels function as template for magnetic functionalization, via self-terminated Fe electrodeposition (5-10 nm FeOx/Fe coating). The increased surface-to-volume ratio boosts the MI effect, that relies on reactive interfaces. At room temperature and a magnetic field of -2 T an average MR of -0.043% (-0.007%) for the reduction (oxidation) state is achieved, representing a 6-fold increase of the average MR via voltage. Future optimization of such magneto-ionically controlled 3D nanomaterials can advance the development in low-power sensors, computation or information storage devices. [1] Fischer et al., APL Mater. 8 (2020) 010701. [2] Nichterwitz et al., ACS Mater. Au (2023) in print
Keywords: magneto-ionic; magnetoresistance; 3D nanomaterial; voltage control of magnetism; electrodeposition