Berlin 2008 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 25: SYM Thin Film Magnetic Materials: Microstructure, Reaction and Magnetic Coupling IV
MM 25.2: Vortrag
Mittwoch, 27. Februar 2008, 16:30–16:50, H 1058
Magnetic microstructures produced by local ion irradiation induced interfacial mixing — •Thomas Strache1, Jörg Grenzer1, Jürgen Fassbender1, Wolfhard Möller1, Rainer Kaltofen2, and Ingolf Mönch2 — 1Forschungszentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Bautzner Landstrasse 128, 01328 Dresden, Germany — 2Leibniz-Institut für Festkörper- und Werkstoffforschung IFW Dresden, Institute for Integrative Nanoscience, P. O. Box 270116, 01171 Dresden, Germany
Ion irradiation of Ni80Fe20/Ta multilayers induces an interfacial mixing of these two materials, which subsequently leads to a suppression of the ferromagnetic properties. In order to quantify the structural change grazing incidence x - ray reflectometry has been used. The ion irradiation induced intermixing has been studied by means of TRIDYN simulations. The broadening of the interfaces due to intermixing causes an enrichment of Ta in Ni80Fe20 and finally an amorphization of Ni80Fe20 above a Ta concentration of 10 to 20 percent [1]. Consequently the ferromagnetic properties are altered or even suppressed completely for high enough ion fluences. It is observed that the critical ion fluence for a complete suppression of the ferromagnetism depends sensitively on the number of interfaces. It is demonstrated that pure magnetic microstructures can be easily fabricated by local ion irradiation without changing the substrate topography.
[1]J. Fassbender et al., Nucl. Instr. and Meth. in Phys. Res. B 248, 343 (2006).