Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 23: Magnetic Domain Walls
MA 23.1: Vortrag
Mittwoch, 7. September 2022, 09:30–09:45, H48
Atomic-scale Insights to Design of High-Performing SmCo based Sintered Permanent Magnets gained by Atom Probe Tomography — •Nikita Polin1, Stefan Giron2, Esmaeil Adabifiroozjaei2, Yangyiwei Yang2, Alaukik Saxena1, Oliver Gutfleisch2, and Baptiste Gault1,3 — 1Max-Planck-Institut für Eisenforschung GmbH, Düsseldorf 40237, Germany — 2Institute of Materials Science, Technische Universität Darmstadt, 64287 Darmstadt, Germany — 3Department of Materials, Royal School of Mines, Imperial College, Prince Consort Road, London SW7 2BP, United Kingdom
Hard disc drives, electric cars and wind turbines - in all these devices permanent magnets are key components to translate mechanical into electrical energy and vice versa. Enhancing performance of permanent magnets thus contributes to energy transition and sustainability. However, practically the performance of permanent magnets only reaches 20% of the possible maximum (called Brown’s paradox). This is related to imperfect nanostructure and nanocomposition where atom probe tomography is a suitable tool to gain atomic-scale insights.
In this talk I will present a structural and magnetical investigation of high-end production-grade Sm2(Co,Fe,Cu,Zr)17 permanent magnets which show unusual regions leading to suboptimal performance. Local differences of nano-structure and nano-composition between both regions are studied by atom probe tomography and transmission electron microscopy combined with micromagnetic simulations. These findings suggest design rules for higher performance of Sm2Co17 magnets.