Dresden 2003 – wissenschaftliches Programm
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MA: Magnetismus
MA 14: Poster: Schichten(1-31), Spinabh.Trsp.(32-47), Exch.Bias(48-54), Spindyn.(55-64), Mikromag.(65-76), Partikel(77-88), Oflmag.(89-92), Spinelektr.(93-98), Elektr.Theo.(99-103), Mikromag+PhasÜ+Aniso.(104-122), MagnMat.(123-134), Messm+Mol-Mag.(135-139), Kondo(140-151)
MA 14.19: Poster
Dienstag, 25. März 2003, 15:15–19:15, Zelt
Texture and magnetic properties of laser deposited SmCo thin films — •S. Leinert, V. Neu, S. Fähler, B. Holzapfel, and L. Schultz — IFW Dresden, Postfach 270016, 01171 Dresden
Hardmagnetic SmCo films which are prepared on heated, untextured substrates (poly-Al2O3, SiN) obtain high coercivities of 1 - 2 T. Furthermore, they show a magnetic in-plane texture, where the c-axis of the grains and therefore the easy magnetization axis is preferably oriented in the film plane. This makes these films highly interesting for device applications where strong permanent in-plane fields are required. The degree of texture depends on background gas pressure and stoichiometry, but other than for magnetron sputtered films, in the case of laser deposited SmCo films the texture improves for low background gas pressure or UHV. This shows the important role of the kinetic energy of the plasma ions (up to 100 eV in UHV) in the growth and texturing of SmCo films.
We attempt an explanation of the texturing mechanism by considering several influences present during grain growth, such as surface energies, the stray field energy, and the kinetic energy of the plasma ions including resputtering effects. The texture and the magnetic properties of laser deposited films are studied as a function of film thickness, background gas pressure and substrate tilt. The influence of reputtering is examined by focusing an additional ion beam onto the substrate during film deposition (IBAD).