Regensburg 2004 – wissenschaftliches Programm

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MA: Magnetismus

MA 13: Poster:Schichten(1-23),Spinabh.Trsp(24-41),Exch.Bias(42-56),Spindyn.(57-67),Mikromag.(68-76),Partikel(77-90),Spinelektr.(91-97),Elektr.Theo.(98-99),Mikromag+PhasÜ+Aniso.(100-105),Magn.Mat.(106-118),Messmethod.(119-121),Obflm.+Abbverf.(122-123)

MA 13.18: Poster

Dienstag, 9. März 2004, 15:00–19:00, Bereich A

Textured and highly coercive SmCo₅ PLD thin films on amorphous substrates — •S. Leinert, V. Neu, S. Fähler, B. Holzapfel, and L. Schultz — IFW Dresden, Helmholtzstr. 20, 01069 Dresden and SFB 463

Hardmagnetic SmCo₅ thin films have been prepared by pulsed laser deposition from elemental targets under UHV conditions on amorphous SiN substrates. The films have Cr buffer and cover layers to prevent oxidation. Experiments have been carried out that show the dependence of the phase formation on pulse frequency and pulse alternation. These deposition parameters, apart from the intended film thickness, determine the deposition time and thus decide the available time for atomic diffusion. For the best developed phases room temperature coercivities as high as 3.5T for a film thickness around 100nm were achieved. Beyond that, efforts have been made to improve the texture of the films with the aim to orient the easy magnetisation axis along one axis within the film plane. Investigations concentrated on substrate tilting (inclined substrate deposition) and ion beam assisted deposition with low energy Ar ions (different ion energies, beam currents and angles of incidence). Ion beam etching experiments on SmCo have been performed to find possible texturing mechanisms in the IBAD process.