Regensburg 2004 – wissenschaftliches Programm

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MA: Magnetismus

MA 15: Magnetische dünne Schichten I

MA 15.10: Vortrag

Mittwoch, 10. März 2004, 17:30–17:45, H10

Highly coercive and highly remanent Nd-Fe-B films — •Sebastian Fähler, Jörg Buschbeck, Ah-Ram Kwon, Ullrich Hannemann, Volker Neu, Bernhard Holzapfel, and Ludwig Schultz — IFW Dresden, Helmholtzstr. 20, 01069 Dresden and SFB 463

Miniaturised magnets with high remanences are needed for micro-electromechanical systems (MEMS). A possible solution is epitaxially grown Nd₂Fe₁₄B films which exhibit due to the perfect alignment of the c-axis (easy magnetisation direction) very high remanence to saturation magnetisation ratios close to unity. Furthermore these films reach coercivities up to 2 T [1]. Films, which were deposited at lower temperatures and subsequently annealed at higher temperatures, show similar results despite the different temperature treatment [2]. One result of the different temperature treatment is a change in the morphology of the films, which consists of isolated grains for the epitaxial films or appears continuous for the post-deposition annealed films. We present a study of the effect of the 2 different deposition conditions on the microstructure and consequently on the magnetic properties of the films.

[1] U.Hannemann, S. Fähler, V. Neu, B. Holzapfel, L.Schultz, Appl. Phys. Lett. 82 (2003) 3710

[2] L.K.E.B Serrona, A. Sugimura, N. Adachi et al., Appl. Phys. Lett. 82 (2003) 1751