Regensburg 2019 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 16: Multiferroics and Magnetoelectric coupling II (joint session MA/KFM)

KFM 16.9: Vortrag

Freitag, 5. April 2019, 11:30–11:45, H39

Manipulating Coercivity and Mangetization Reversal in Bulk Ferromagnetic Metals with Small Voltages — •Xinglong Ye, Robert Kruk, and Horst Hahn — Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen, 76344, Germany

Voltage control of magnetic properties in ferromagnetic metals is usually restricted to the scale of atomic layer due to their strong electric-field screening. Here we show that magnetic properties of bulk ferromagnetic metals can be hugely and reversibly tuned by small voltages through charging and discharging of hydrogen atoms. We manipulated the coercivity of micrometer-sized ferromagnetic metals by an amplitude of 2500 Oe with voltages only around 1 volt. Through this effect voltage-assisted and -gated magnetization reversal have been demonstrated. Experimental and density functional theory simulation results suggest that this phenomenon originates from the change of magnetocrystalline anisotropy at the surface layers with absorption and desorption of hydrogen atoms, which changes the nucleation field of reversed domains. This work may open up a new route for voltage control of magnetic properties in bulk metals, and voltage-assisted magnetization reversal also has implications for magnetic recording.