Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 57: Focus Session: Spinorbitronics – from efficient charge/spin conversion based on spin-orbit coupling to chiral magnetic skyrmions III (joint session MA/TT)

MA 57.1: Hauptvortrag

Freitag, 16. März 2018, 09:30–10:00, H 1012

Manipulation of interface-induced Skyrmions studied with STM — •Kirsten von Bergmann — University of Hamburg, Germany

Isolated magnetic skyrmions are envisioned as the basis for future spintronic devices. They can be stabilized by a favorable interplay of magnetic exchange, Dzyaloshinskii-Moriya interaction (DMI), anisotropy and Zeeman energy. The Fe/Ir(111) interface is known to exhibit strong DMI [1] and serves as an ideal basis to build up materials that host single skyrmions on the nanometer length scale. Such small magnetic objects can be imaged, characterized and manipulated using (spin-resolved) scanning tunneling microscopy (STM) [2].

Building upon the Fe/Ir(111)-interface a fine-tuning of the relevant magnetic energies is performed by adding metallic overlayers, by adsorption of hydrogen, or by a variation of the strain within the magnetic film. Magnetic field dependent STM measurements can be used to obtain the specific material parameters [3]. In addition, spectroscopy using a non-magnetic tip electrode reveales the correlation between the local magnetoresistance and the non-collinearity of the spin texture [4]. Such a read-out of the local magnetic state could be combined with the demonstated reversible switching between skyrmion and ferromagnet by local electric fields [5].

[1] Heinze et al., Nature Phys. 7, 718 (2011). [2] von Bergmann et al., J. Phys.: Condens. Matter 26, 394002 (2014). [3] Romming et al., Phys. Rev. Lett. 114, 177203 (2015). [4] Hanneken et al., Nature Nanotech. 10, 1039 (2015). [5] Hsu et al., Nature Nanotech. 12, 123 (2017).