Regensburg 2004 – wissenschaftliches Programm

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MA: Magnetismus

MA 11: Magnetische Materialien

MA 11.10: Vortrag

Dienstag, 9. März 2004, 12:30–12:45, H22

Microstucture of bulk SmCo_2.5Cu_2.5 and magnetisation in high pulse fields — •Peter Kerschl¹, Kirill Khlopkov¹, Axel Handstein¹, Dieter Eckert¹, Juan-Carlos Tellez-Blanco², Roland Grössinger², Karl-Hartmut Müller¹, and Ludwig Schultz¹ — ¹Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, Postfach 270116, D-01171 Dresden, Germany — ²Institut für Festkörperphysik, Technische Universität Wien, Wiedner Hauptstraße 8-10, A-1040 Wien, Austria

SmCo₅ has a very good performance as permanent magnet material. It is known that a strong influence of Cu substitution on the magnetic properties exists: An unusual jump from low to high magnetisation state in an increasing external field is observed. To obtain a better insight, a SmCo_2.5Cu_2.5 compound was prepared. Phase composition and microstructure have been investigated by X-ray diffraction, scanning electron microscopy and EDX analysis. The results of high field magnetisation measurements in pulse fields up to 48 T at temperatures from 4.2 K up to 300 K are discussed. The coercivity at low temperatures is up to about µ_0JH_C ≈ 15 T at 4.2 K. At high fields, a metamagnetic transition occurs. The critical field of this transition increases with decrasing temperature reaching about 28 T at 4.2 K. The influence of the field changing rate on the observed magnetic properties is discussed. This work is supported by the BMBF project 03 SC 5 DRE.