Regensburg 2025 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Poster I
MA 15.9: Poster
Dienstag, 18. März 2025, 10:00–12:30, P1
Manipulation of Surface Domains in an Ultrasoft van-der-Waals Ferromagnet — •Stephan Schmutzler1, Yichen Jin1, Guangyao Miao2,3, Florian Kronast4, Sergio Valencia4, Zefang Li5, Martin Weinelt1, and Cornelius Gahl1 — 1Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — 2Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China — 3Department of Physics and CSMB, Humboldt-Universität zu Berlin, Berlin 12489, Germany — 4Helmholtz-Zentrum Berlin, Albert-Einstein-Str. 15, 12489 Berlin, Germany — 5School of Physics, Nankai University, Tianjin, China
The layered van-der-Waals material Cr2Ge2Te6 (CGT) is a very soft ferromagnet at temperatures below 61 K. We show by X-ray magnetic circular dichroism in photoelectron emission microscopy (XMCD-PEEM) that the surface domain structure of a bulk CGT crystal can be reproducibly switched between topologically different phases by ultrashort laser pulse trains in combination with applying small magnetic fields. The effect is attributed to the transient temperature profile normal to the surface established by the interplay of absorption of light and the low interlayer heat conductivity of the material. The laser parameters accordingly allow for tayloring the sample depth of domain manipulation.