Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 39: Micro- and Nanostructured Magnetic Materials I
MA 39.8: Vortrag
Donnerstag, 29. März 2012, 11:30–11:45, EB 202
Highly coercive and textured SmCo5 nanoflakes prepared by surfactant assisted high energy ball milling — •Santosh Kumar Pal1, Juliane Thielsch1, Ludwig Schultz1, and Oliver Gutfleisch1,2 — 1IFW Dresden, Helmholtzstraße 20, 01069 Dresden, Germany — 2Technische Universität Darmstadt, Institut für Materialwissenschaft, Petersenstr. 23, 64287 Darmstadt, Germany
Exchange-coupled nanocomposite magnets consisting of a highly coercive and textured hard magnetic phase and a soft magnetic phase with high magnetization have potential to be the next generation of permanent magnets with very high energy products. In this study, we discuss the effects of the type and amount of surfactants on the structural, morphological and magnetic properties of SmCo5 nanoflakes prepared by high energy ball milling. Increase in surfactants concentration result in the decrease of degree of amorphization and reduction in crystallite size with milling time. The coercivity of flakes first increase with milling time up to maximum values of 1.78, 1.96 and 2.07 tesla for 5, 10 and 30 wt.% of PVP respectively, further milling results in decrease of the coercivity and the rate of decrease is lower for higher surfactant concentration. A maximum coercivity of 2.29 tesla was obtained after a milling time of 1.0 and 2.0 h for 10 and 50 wt.% of OA respectively. Degree of texture (DOT) increases with increase in surfactants concentration and decreases monotonically with milling time, 73% of DOT was obtained for 50 wt.% OA after 0.5 h of milling. The pronounced anisotropy and high coercivity of the nanoflakes should prove advantageous for the preparation of exchange spring magnets.