Dresden 2011 – wissenschaftliches Programm

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KR: Fachgruppe Kristallographie

KR 5: Poster Multiferroics (Joint Session of MA, DF, DS, KR, TT)

KR 5.36: Poster

Dienstag, 15. März 2011, 10:45–13:00, P2

Ion-beam induced magnetic nanostructures in Fe/Cu(100) — •Sameena Shah Zaman, Hinnerk Ossmer, Jakub Jonner, Zbyněk Novotný, Andreas Buchsbaum, Ondrej Krapek, Petr Dvorak, Michael Schmid, and Peter Varga — TU Wien, Institut für Angewandte Physik, Wien, Austria.

We demonstrate fabrication of nanoscale magnetic patterns by ion irradiation. For this purpose, we have grown face-centered cubic (fcc) 8-ML and 22-ML thick Fe films on a Cu(100) single crystal; the latter ones stabilized by CO. A structural transformation of these films from the paramagnetic fcc to the ferromagnetic bcc phase can be induced by Ar⁺ ion irradiation [1]. Scanning tunneling microscopy images show the nucleation of bcc crystallites, which grow with increasing Ar⁺ ion dose and eventually result in complete transformation of the film to bcc. Surface magneto-optic Kerr effect measurements confirm the transformation of the Fe film from paramagnetic to ferromagnetic with an in-plane easy axis. We also demonstrate the transformation of films coated with Au to protect them from oxidation at ambient conditions. Nano-patterning was conducted on these films via a SiN mask having 80-nm-diameter holes.

[1] S. Shah-Zaman et al., Phys. Rev. B 82, 235401 (2010).