Dresden 2020 – scientific programme
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MA: Fachverband Magnetismus
MA 38: Multiferroics and Magnetoelectric Coupling II (joint session MA/KFM)
MA 38.8: Talk
Wednesday, March 18, 2020, 16:45–17:00, HSZ 401
Magneto-ionic tunable hysteresis, magnetic domains and exchange bias in ironoxide/iron surface layers — •Jonas Zehner1, Rico Huhnstock2, Steffen Oswald1, Sebastian Schneider1, Ivan Soldatov1, Sebastian Fähler1, Rudolf Schäfer1, Arno Ehresmann2, Kornelius Nielsch1, Dennis Holzinger2, and Karin Leistner1 — 1IFW Dresden — 2Uni Kassel, Institut für Physik und CINSaT
The ubiquity and rise in the use of electronic devices demands low power operation modes. Voltage assisted ionic displacement and electrochemical processes offer large magnetic changes at room temperature. This so called magneto-ionic (MI) control shows promising characteristics to enable energy efficient spintronics, actuation and neuromorphic computing. In the current study, MI effects on coercivity and exchange bias (EB) are demonstrated for sputter deposited and natively oxidized FeOx/Fe films of up to 13 nm in thickness. In FeOx/Fe films, the uniaxial anisotropy constant Ku increases upon an electrochemical transformation of the oxide layer to metal iron. At the same time, consistent with the anisotropy change, the equilibrium magnetic domain size increases. This effect enables voltage-induced 180° magnetization switching. In a next step, this tunable FeOx/Fe layer is combined with an underlying antiferromagnet. Non-volatile and reversible changes in the EB are achieved this way. The mechanism is revealed via X-ray photoemission spectroscopy and links the observed changes to an increase in the Fe layer thickness. These results are exciting for designing EB systems and magneto-electric devices in general.