Regensburg 2025 – scientific programme
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MA: Fachverband Magnetismus
MA 31: Poster II
MA 31.11: Poster
Wednesday, March 19, 2025, 17:00–19:30, P1
Pt-catalyzed hydrogen magneto-ionics in Co/Pd multilayers — •Felix Engelhardt1,2, Rico Ehrler1,2, Olav Hellwig1,2, Karin Leistner1,2, and Markus Gößler1 — 1Chemnitz University of Technology, D-09107 Chemnitz, Germany — 2Research Center MAIN, D-09126 Chemnitz, Germany
Magneto-ionics, which is the electrochemical reconfiguration of magnetic materials at low gating voltages, offers a highly energy-efficient method to control magnetism. One major issue of this mechanism, however, is its response time, which is limited by the timescale of the electrochemical reactions. Here, we demonstrate that the hydrogen-based magneto-ionic effect in sputtered Co/Pd multilayers [1] can be accelerated catalytically via an additional Pt layer at the surface.
We investigate how the thickness of such a Pt overlayer affects the magneto-ionic effect strength and hydrogen insertion kinetics in the Co/Pd multilayer system. To analyze these effects, we use in-situ MOKE microscopy to monitor the magneto-ionic behavior, while flow-cell coulometry measurements are carried out to quantify the hydrogen concentration in the multilayers.
Our findings reveal that a Pt overlayer with a thickness of 0.5-2 nm significantly enhances the strength of the magneto-ionic effect by a factor of 2, while also reducing the time required for hydrogen insertion by a factor of 10. Our results highlight a route towards faster switching speeds in magneto-ionic devices, which is crucial for future magnetic memory applications.
[1] M. Bischoff et al., Adv. Funct. Mater., 34, 2405323 (2024)
Keywords: magneto-ionics; hydrogen; hydrogen kinetics; Co/Pd multilayer; Pt catalysis