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MM: Fachverband Metall- und Materialphysik

MM 36: Topical Session Bulk Nanostrucured Materials VIII - Functional Properties I

MM 36.2: Vortrag

Mittwoch, 28. März 2012, 15:30–15:45, H 0106

Magnetic Properties of nano-crystalline SPD treated SmFe2 — •Martin Kriegisch^1,2, Roland Grössinger², Reiko Sato-Turtelli², Frank Kubel³, Daria Setman¹, Clemens Mangler¹, Martin Peterlechner¹, and Michael Zehetbauer¹ — ¹Physics of Nanostructured Materials, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria — ²Inst. of Solid State Physics, Vienna University of Technology, Wiedner Hauptstr. 8-10; A-1040 Vienna, Austria — ³Inst. of Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria

High magnetostrictive materials are of great industrial importance, because of their potential application as magneto-mechanical sensor and actuator. The rare-earth intermetallic system SmFe2 exhibits a very high magnetostriction at room temperature. By adding a certain amount of Sm2O3 in the beginning of the melting process, we inhibited grain growth and produced nano-crystalline SmFe2 samples. Moreover we found that the addition of Sm2O3 also leads to a de-coupling of the exchange interaction between the nano-crystalline grains. As a consequence we proved that it is possible to tune SmFe2 from soft to hard-magnetic. After fully characterizing the magnetic and magnetostrictive properties, we investigated the effect of repeated cold-rolling (RCR) on the already nano-crystalline material. The changes of the magnetization and magnetostriction are analyzed and discussed with taking into account the internal stress and the stress-induced anisotropy. This work was supported by the FWF under the NFN-project numbers S10403 and S10406.