Regensburg 2025 – scientific programme

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MA: Fachverband Magnetismus

MA 39: Magnetic Thin Films

MA 39.1: Invited Talk

Thursday, March 20, 2025, 15:00–15:30, H19

Voltage control of magnetism using hydrogen — •Markus Gößler — Chemnitz University of Technology, Chemnitz, Germany

Voltage-controlled magnetic properties have entered the research spotlight as they hold great potential for future spintronic and magnetic memory devices. The use of electrochemistry in voltage-controlled magnetism, dubbed magneto-ionics,[1] promises a superior energy efficiency compared to many conventional mechanisms. Here, we present a versatile magneto-ionic concept based on the hydrogen-loading into [Co/Pd]-based bilayers and multilayer structures with perpendicular anisotropy. We show that the magnetic properties of [Co/Pd] multilayers sensitively depend on the absolute hydrogen concentration in the material and that this concentration can be set electrochemically via the applied voltage.[2] Reversibility and switching speed, as the two main limitations towards practical magneto-ionic devices, can be improved by a targeted multilayer engineering, exploiting synergies with hydrogen electrocatalysis. Funding from DFG-499361641 and ERC-101125178 is acknowledged. [1] Nichterwitz et al. APL Mater. (2021) 030903; [2] Bischoff et al., Adv. Funct. Mater. (2024) 2405323

Keywords: magneto-ionics; magnetic multilayers; hydrogen; electrochemistry; PMA