Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 28: Spin Dynamics and Transport: Domain Walls

MA 28.4: Vortrag

Dienstag, 21. März 2017, 14:45–15:00, HSZ 401

Anticlockwise Néel domain walls in ultrathin Cobalt films on Pt(111)Edna Corredor Vega, •Susanne Kuhrau, Fabian Kloodt, Robert Frömter, and Hans Peter Oepen — Institut für Angewandte Physik, Universität Hamburg, Jungiusstraße 11, 20355 Hamburg, Germany

Recently, the Co/Pt (111) system has attracted large interest because of the potential to stabilize isolated skyrmions at room temperature (RT) due to its large interfacial Dzyaloshinskii-Moriya Interaction (DMI). We present a comprehensive study on Co wedges epitaxially grown on Pt (111) at RT with thicknesses ranging between 0 to 7 ML. The magnetic microstructure is investigated via Scanning Electron Microscopy with Polarization Analysis (SEMPA) [1]. The SEMPA is designed to image the in-plane components of the magnetization. For the investigation the sample was slightly tilted to get access to the perpendicular component. On increase of Co thickness the domain size shrinks. In the thickness range studied all domain walls are of Néel type and show a fixed sense of rotation. For 7 ML the wall width is (10.8±1.3) nm. A lower limit estimate of the DMI vector D [2] reveals a value of D>1 mJ/m2 for 7 ML.

[1] R. Frömter, et al., Rev. Sci. Instrum. 82, 033704, (2011).

[2] A. Thiaville, et al. Europhys. Lett. 100, 57002 (2012).

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