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MA: Fachverband Magnetismus
MA 39: Magnetic Thin Films
MA 39.2: Vortrag
Donnerstag, 20. März 2025, 15:30–15:45, H19
Magneto-ionic control of coercivity in electrodeposited NixFe1−x films — •Anna Ullrich1, Florin L. Hambeck1, Francesca Sgarbi Stabbellini1,2, and Karin Leistner1,2 — 1Institute of Chemistry, TU Chemnitz — 2Leibniz IFW Dresden
Magneto-ionic effects provide a promising route for low-voltage, non-volatile control of magnetic materials, essential for next-generation, energy-efficient devices. Prior research has mainly focused on iron- or cobalt-based thin films and nanostructures.[1] So far only few works mention magneto-ionic effects for Ni-based alloys,[2,3] which are promising due to their unique magnetic properties. This study systematically investigates the magneto-ionic behavior of electrodeposited NixFe1−x films with thicknesses of (160 ± 30) nm as a material platform to enhance magneto-ionic functionality. Coercivities range from (0.4 ± 0.3) mT in Ni80Fe20 (permalloy) to (44.6 ± 0.6) mT in pure Fe, as measured by magneto-optical Kerr effect magnetometry. Magneto-ionic control upon electrolytic gating in 1 M KOH reveals a reduction of coercivity of up to 50 % (e.g., in Ni70Fe30) at −1.18 V versus Ag/AgCl. We discuss this modification in the context of a surface oxide reduction reaction, which can modify the domain wall pinning.[4] The observed effects highlight the potential of magneto-ionic Ni-Fe alloys, especially in thicker films, for sensing and actuation applications. [1] M. Nichterwitz et al., APL Mat. 2021, 9, 030903. [2] D. Murray et al., ACS Appl. Mater. Interf. 2021, 13, 38916. [3] De h-Ora et al., Zenodo 2021, doi:10.5281/zenodo.5769775. [4] J. Zehner et al., Adv. Electron. Mater. 2020, 6, 2000406.
Keywords: magneto-ionics; nickel-iron-alloy; electrodeposition; in situ Kerr-Microscopy