Correlation between magnetic spin structure and the three-dimensional geometry in chemically synthesized nanoscale magnetite rings

The correlation between magnetic spin structure and geometry in nanoscale chemically synthesized Fe 3 O 4 rings has been investigated by transmission electron microscopy. We find primarily the flux closure vortex states but in rings with thickness variations, an effective stray field occurs. Using t...

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Published in:Applied physics letters 2008-06, Vol.92 (22), p.222508-222508-3
Main Authors: Eltschka, M., Kläui, M., Rüdiger, U., Kasama, T., Cervera-Gontard, L., Dunin-Borkowski, R. E., Luo, F., Heyderman, L. J., Jia, C.-J., Sun, L.-D., Yan, C.-H.
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container_end_page 222508-3
container_issue 22
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container_title Applied physics letters
container_volume 92
creator Eltschka, M.
Kläui, M.
Rüdiger, U.
Kasama, T.
Cervera-Gontard, L.
Dunin-Borkowski, R. E.
Luo, F.
Heyderman, L. J.
Jia, C.-J.
Sun, L.-D.
Yan, C.-H.
description The correlation between magnetic spin structure and geometry in nanoscale chemically synthesized Fe 3 O 4 rings has been investigated by transmission electron microscopy. We find primarily the flux closure vortex states but in rings with thickness variations, an effective stray field occurs. Using tomography, we determine the complete three-dimensional geometries of thicker rings. A direct correlation between the geometry and the magnetization which points out of plane in the thickest parts of the ring yielding an intermediate magnetic state between the vortex state and the tube state is found. The interaction between exchange coupled rings leads to antiparallel vortex states and extended onion states.
doi_str_mv 10.1063/1.2936989
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title Correlation between magnetic spin structure and the three-dimensional geometry in chemically synthesized nanoscale magnetite rings
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