Regensburg 2019 – scientific programme
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MA: Fachverband Magnetismus
MA 23: Soft and hard permanent bulk magnets
MA 23.4: Talk
Tuesday, April 2, 2019, 14:45–15:00, H53
Rare-earth lean exchange spring permanent magnets — •Stefan Riegg1, Lukas Schäfer1, Iuliia P. Novoselova2, Tobias Braun1, Marina Spasova2, Iliya Radulov1, Corinna Müller1, Ralf Meckenstock2, Konstantin P. Skokov1, Michael Farle2, and Oliver Gutfleisch1 — 1Funktionale Materialien, Fachbereich Material- und Geowissenschaften, Technische Universität Darmstadt, 64287 Darmstadt, Germany — 2Fakultät für Physik und Center for Nanointegration (CENIDE), Universität Duisburg-Essen, 47057 Duisburg, Germany
Standard high performance permanent-magnet materials are based on rare-earth element – 3d metal compounds such as Nd-Fe-B and Sm-Co. To increase sustainability of these magnets, a reduction of the rare-earth element content could be one target. For instance, exchange spring magnets could be a reasonable solution to this task. In this class of materials the exchange interaction of a hard- and a soft-magnetic phase leads to a simultaneously high remanence and high coercivity, although only a relatively small fraction of the hard-magnetic material is present.
A rare-earth lean Nd-Fe-B related material is commercially available as gas-atomized powder: MQP-S. The production of magnets based on this powder will be shown for different routes (Polymer bonding, 3D printing, hot compaction), and the respective stabilities of the exchange coupling behavior and coercivity will be discussed. Advanced characterization of magnetic properties as well as detailed microstructural investigations will be presented.