Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 27: Micro- and Nanostructured Magnetic Materials II
MA 27.10: Vortrag
Donnerstag, 29. März 2007, 17:30–17:45, H22
Hard magnetic L10 - FePt thin films and nanopatterns — •Achim Breitling and Dagmar Goll — MPI für Metallforschung, Stuttgart, Germany
FePt is a promising candidate for ultra high-density data storage based on patterned media due to its large uniaxial magnetocrystalline anisotropy (K1 = 6.6 · 106 J/m3) and its high corrosion resistance.
Therefore FePt thin films of thicknesses varying between 5 nm and 200 nm were sputter deposited on MgO(100) single crystal substrates. The ordered L10 phase can be obtained either directly by deposition on heated substrates or by post-annealing. Below a critical film thickness the films split into an accumulation of isolated particles of irregular shape resulting in large coercivities up to µ0HC = 4.5 T.
By using electron beam lithography patterned L10 FePt nanostructures have been produced. The influence of patterning on the magnetic properties of hard magnetic L10 FePt thin films has been investigated.