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MA: Magnetismus

MA 29: Magnetic Thin Films IV

MA 29.3: Vortrag

Donnerstag, 30. März 2006, 15:45–16:00, HSZ 03

Exchange-coupled Sm-Co trilayer systems — •Katrin Häfner, Ajit Patra, Volker Neu, Steffen Oswald, and Ludwig Schultz — IFW Dresden, P.O. Box: 270116, 01171 Dresden, Germany

Exchange-coupled Sm-Co trilayers have been prepared by pulsed laser deposition on Cr buffered MgO(110) substrates at elevated temperature. Soft magnetic layers of Fe and Fe-Co were sandwiched between two hard magnetic Sm-Co layers of 25 nm thickness and their influence on the magnetic properties was investigated. Film architecture, texture and magnetic properties of the films have been investigated by x-ray photo electron spectroscopy, pole figure measurements and vibrating sample magnetometry. The texture investigations show that the Sm-Co/Fe/Sm-Co and Sm-Co/Fe-Co/Sm-Co trilayers grow epitaxially throughout the whole layer stack with the following relationship: Sm-Co(100)[001]∣∣ Fe/Fe-Co(211)[01-1]∣∣Sm-Co(100)[001]∣∣Cr(211)[01-1]∣∣MgO(110)[001]. By varying the soft layer thickness d_s the magnetic behaviour of the trilayer changes from a completely coupled system with high coercivity of 1.5 T for d_s = 5 nm to a partially coupled regime with coercivities decreasing down to 0.8 T for d_s= 15 nm. The epitaxial growth of Sm-Co/Fe-Co/Sm-Co trilayers has been observed for the first time and is a very promising approach for fully coupled, remanence enhanced permanent magnet multilayers.