Regensburg 2004 – wissenschaftliches Programm

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MA: Magnetismus

MA 30: Magnetische dünne Schichten III

MA 30.6: Vortrag

Freitag, 12. März 2004, 12:00–12:15, H10

Textured growth of highly coercive L1₀ ordered FePt thin films — •Martin Weisheit, Ludwig Schultz, and Sebastian Fähler — IFW Dresden, Helmoltzstr. 20, 01069 Dresden

Due to its high uniaxial magnetocrystalline anisotropy, the L1₀ ordered FePt phase is seen as a future candidate for high density magnetic recording. FePt thin films have been prepared by pulsed laser deposition onto heated (001) oriented single crystalline (MgO, SrTiO₃) as well as amorphous substrates (Si₃N₄, glass) with and without a (001) textured MgO buffer layer. Although all films have been prepared under identical conditions, significant differences in coercivity are observed. Very high values of µ₀H_c=5.6 T and 4.0 T have been measured for epitaxial films on MgO and SrTiO₃, respectively, while on the amorphous substrates the coercivities range between 0.8 and 2.0 T. We discuss whether changes in intrinsic or extrinsic properties due to a modified microstructure are responsible for these differences.