Berlin 2018 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 27: Postersession KFM
KFM 27.6: Poster
Donnerstag, 15. März 2018, 15:00–17:00, Poster E
Investigation of magneto-ionic effects on Au-Fe (core-shell) nanowires — •Martin Nichterwitz1,2, Shashank Honnali1, Tom Sieger1, Diana Pohl1, Anna Niemann1, Kornelius Nielsch1, and Karin Leistner1 — 1IFW Dresden, Helmholtzstr. 20, 01069 Dresden, Germany — 2Technische Universität Dresden, Physikalische Chemie, 01062 Dresden, Germany
Miniaturization and the demand for low-power devices led to increasing research of voltage-controlled devices, which do not show effects like joule heating. It was recently shown that reversible magneto-ionic manipulation with up to 64 % change in magnetization of Fe/FeOx films is possible at room temperature in liquid alkaline electrolytes. [1,2] The change of geometry from thin films to nanowires (NW) promises enhanced magneto-ionic effects due to the higher surface/volume ratio. We present an approach to observe the above stated effect using Au-Fe-NWs (core-shell). Au-NWs are grown by electrodeposition into a nano-porous Al2O3-template. Individual Au-NWs are electrically contacted on a glass substrate using laser lithography and a metallization process. Subsequently, a 5-10 nm thick Fe shell is electrodeposited on the Au-NW. To investigate the magneto-ionic effects, in-situ measurements (resistivity and magnetization) will be performed under different potentials in liquid alkaline electrolytes. This is expected to lead to the reversible switching between ferromagnetic and non-ferromagnetic states in the Fe/FeOx shell on the NW, due to reduction and oxidation processes, respectively. [1] K. Duschek et al., Electrochem. Comm. 72, 2016, 153 [2] K. Duschek et al., APL Mater. 4, 2016, 032301