Ion-beam induced fcc-bcc transition in ultrathin Fe films for ferromagnetic patterning

W. Rupp1,2, A. Biedermann3, B. Kamenik1, R. Ritter1, Ch. Klein2, E. Platzgummer2, M. Schmid1, P. Varga1

1 Institut für Allgemeine Physik, Technische Universität Wien, 1040 Wien, Austria
2 IMS Nanofabrication AG, 1020 Vienna, Austria
3 Faculty of Physics, University of Vienna, 1090 Wien, Austria

Appl. Phys. Lett. 93 (2008) 063102

Ar+ ion irradiation is used to induce a structural change from fcc to bcc in a 1.5 nm thick Fe film epitaxially grown on a Cu(100) crystal. Scanning tunneling microscopy and low-energy electron diffraction show the nucleation of bcc nanocrystals, which grow with increasing ion dose. As a consequence of the structural change, the irradiated iron film becomes strongly ferromagnetic at room temperature. We present a model for the process of the transformation and demonstrate writing a magnetic pattern at the 100 nm scale by ion-beam projection lithography.

Corresponding author: A. Biedermann. Reprints also available from M. Schmid (schmid< encoded email address >).

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