Current-induced domain wall oscillations in a nanowire imaged by time-resolved photoemission electron microscopy

• Published in: Journal of magnetism and magnetic materials Vol. 476; pp. 538 - 545
• Main Authors: Khan, M. Imtiaz, Cramm, Stefan, Bürgler, Daniel E., Parlak, Umut, Nemšák, Slavomir, Gottlob, Daniel M., Hackl, Johanna, Doğanay, Hatice, Schneider, Claus M.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.04.2019; Elsevier BV
• Subjects: Circular polarization; Dichroism; Domain walls; Nanowires; Oscillations; Photoelectric emission; Photoemission electron microscopy; Pump-probe mode; Synchrotron radiation; X-ray magnetic circular dichroism; X-ray magnetic circular dichroism; Pump-probe mode; Photoemission electron microscopy; Synchrotron radiation
• ISSN: 0304-8853; 1873-4766
• DOI: 10.1016/j.jmmm.2019.01.003

•Pump-probe observation of high-frequency domain wall motion due to current pulse..•Oscillation of a nanowire domain wall modelled by oscillation of an elastic string.•X-ray Sample design enables X-ray PEEM studies of current-pulse excitations in nanowires. We study reversible domain wall motion in half-ring Ni80Fe20 nanowires on a nanosecond (ns) timescale in a truly current-induced pump-probe experiment using an energy filtered, aberration-corrected photoemission electron microscope. The X-ray magnetic circular dichroism signal is probed at different time delays before, during and after the current pulse in a stroboscopic mode with circularly polarized synchrotron radiation in the energy range of the Fe L3-edge (707 eV). We observe lateral domain wall oscillations with a frequency of ∼0.4 GHz. Comparing the results to a proposed string model, we find that the domain wall oscillations can be described as string-like asymmetric oscillations.