Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 53: Magnetic Scattering Methods
MA 53.8: Vortrag
Freitag, 11. März 2016, 11:30–11:45, H33
Imaging of magnetic nanodots utilizing soft x-ray holographic microscopy — •Jochen Wagner1, Kai Bagschik1, Stefan Freercks1, Carsten Thönnißen1, André Kobs1,2, Robert Frömter1, Leonard Müller2, Magnus H. Berntsen3, Gerhard Grübel2, and Hans Peter Oepen1 — 1Institut für Nanostruktur- und Festkörperphysik, Uni Hamburg, Germany — 2DESY, Hamburg, Germany — 3KTH Royal Institute of Technology, Stockholm, Sweden
X-ray Fourier transform holography (FTH) has become a competitive technique to investigate magnetic samples with up to sub-20 nm spatial resolution exploiting the x-ray magnetic circular dichroism [1].
We used this technique to image arrays of nanodots with perpendicular magnetization. The nanodots are structured by e-beam lithography from a (Co (0.8 nm)/Pt (0.8 nm))8 multilayer film prepared by dc magnetron sputtering and ion assisted sputtering on 200 nm thick Si3N4 membranes. The diameter of the dots is 60 nm and the interdot spacing of the arrays varies from 100 to 160 nm.
We prepare the arrays in a state of randomized magnetization. The system is step-by-step magnetized. Averaged information about the magnetic state of the dots at different magnetic fields can be extracted from the intensity of the Bragg peaks even in single helicity holograms. By simulation the key features of the holograms can be reproduced and correlated to the magnetic state imaged by FTH.
[1] D. Stickler, et al., Appl. Phys. Lett. 96, 042501 (2010).