Berlin 2008 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 7: Micro and Nanostructured Magnetic Materials II

MA 7.12: Vortrag

Montag, 25. Februar 2008, 18:00–18:15, EB 301

Exchange coupled L1₀-FePt/Fe thin films and nanopatterns — •Achim Breitling and Dagmar Goll — Max-Planck-Institut für Metallforschung, Heisenbergstr. 3, 70569 Stuttgart, Germany

Bilayered L1₀-FePt/Fe composite nanopatterns are a very promising possibility to push data storage density up to 1 Tbit/inch² and beyond. The hard magnetic L1₀-FePt layer with its high uniaxial anisotropy constant of K₁ = 6.6·10⁶ J/m³ guarantees long-term stability even at small particle sizes whereas the addition of a Fe layer creates moderate switching fields achievable by conventional write heads. Therefore in a first step the magnetic properties of L1₀-FePt/Fe films were investigated as a function of the Fe film thickness. It is found that the coercive field µ₀H_c can be tailored between 0.29 T and 2.75 T by the appropriate choice of the thickness of the Fe film. In a second step L1₀-FePt and L1₀-FePt/Fe nanopatterns respectively were produced using various electron lithography techniques. The magnetic properties of the nanopatterns are compared with those of the continuous films.