Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 64: Poster 1
MA 64.48: Poster
Freitag, 24. März 2017, 09:30–13:00, P2-EG
Correlation in (un-)frustrated artificial spin ice — •Jochen Wagner1, Stefan Freercks1, Ralph Buß1, Kai Bagschik1, Robert Frömter1, Matthias Riepp2, André Philippi-Kobs2, Magnus H. Berntsen3, Leonard Müller2, 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 holographic microscopy (XHM) has become a competitive technique to investigate magnetic samples with sub-20-nm spatial resolution exploiting x-ray magnetic circular dichroism [1]. With this technique, we imaged simple-cubic (unfrustrated) and kagome (frustrated) artificial spin ice (ASI) made up of nanodots with perpendicular magnetization. The nanodots are structured by e-beam lithography from (Co0− 2 nm/Pt1.4 nm)10 multilayer films prepared by dc magnetron sputtering and ion assisted sputtering on Si3N4 membranes. The dots have diameters of 90 nm and 110, 130 or 160 nm next-neighbor distance. The simple-cubic ASIs favor an alternating, checkerboard-like state for the 110 nm distances, indicating a short-range order due to magnetostatic interaction. For larger distances no order could be observed and the ASI show random distribution. For the kagome ASI a similar behavior is observed. Due to magnetostatic interaction, they strongly favor a two-up one-down or vice versa state, following the ice rule. This correlation was again not observed at larger distances of 130 and 160 nm.
[1] D. Stickler, et al., Appl. Phys. Lett. 96, 042501 (2010).