Regensburg 2013 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 12: Poster 1

DF 12.64: Poster

Dienstag, 12. März 2013, 10:30–13:30, Poster D

Magnetic and Structural investigation of high performance Rare earth permanent magnets — •Sapana Tripathi, Eberhard Goering, Gisela Schütz, and Dagmar Goll — Max Planck Institut für Intelligente Systeme, Heisenbergstr. 3 ,70569 Stuttgart

The study of rare earth permanent magnets has a great importance from the viewpoints of both academic research and large variety of applications in modern technologies. The most powerful permanent magnetic material at present which derive their exceptional magnetic characteristic from the favorable combination of rare earth metal is Neodymium-Iron-Boron (Nd,Dy)2Fe14B magnets. In order to clarify the contribution of rare earth elements in magnetism, the magnetic characteristics have been determined quantitatively from X-ray magnetic circular dichroism (XMCD) , element specific hysteresis loops and magnetic moments using our new 7 Tesla magnet XMCD system, which is able to saturate the (Nd,Dy)2Fe14B magnets. Further investigations related to the micro structure are presented as energy dispersive X-ray analysis, high-resolution transmission electron microscopy and SQUID measurements. The results prove an unexpected very weak ferromagnetism rare earth side.

1. D. Goll H. Kronmüller High-performance permanent Magnets Naturwissenschaften (2000) 87:423*438 2. Karl J. Strnat Modern Permanent Magnets for Applications in Electro-Technology University of Dayton, Ohio Proceedings of the IEEE, Volume 78, Number 6, June 1990