Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 50: Bulk Materials: Soft and Hard Permanent Magnets
MA 50.3: Vortrag
Donnerstag, 12. März 2026, 15:30–15:45, POT/0151
Magnetic imaging of interaction domains in nanocrystalline Nd-Fe-B by X-rays — P. Klaßen1, D. Günzing2, A. Aubert3, B. Eggert1, T. Feggeler2,4, •L. Kämmerer1, G. Kämmerer1, F. Maccari3, J. Neethijaran5, A. Ditter2, D. Shapiro2, H. Wende1, K. Skokov3, O. Gutfleisch3, C. Donnelly5, and K. Ollefs6 — 1Uni. Duisburg-Essen and CENIDE, GER — 2LBNL, ALS, CA US — 3Mat. Sc., TU Darmstadt, GER — 4BNL, NSLS-II, NY US — 5MPI-CPfS, Dresden, GER — 6KIP, Uni. Heidelberg, GER
Nd-Fe-B magnets play a key role in sustainable energy conversion due to their high energy density. We provide insights into the magnetic domain structure of nanocrystalline Nd-Fe-B magnets obtained by X-ray ptychographic coherent diffractive imaging. The magnetic interaction domains of nanocrystalline Nd-Fe-B magnets with different compositions and grain structures (Nd2Fe14B and Nd15Fe78B7 melt spun ribbons and hot-deformed Nd-Fe-B from MQU-F) are shown and correlated to its microstructure. The soft X-ray imaging at the Fe L3 edge provides detailed insights into the complex magnetic structure within the magnets, down to individual grains in the nanometer regime ( 10 nm). With 3D X-ray ptycho-tomography imaging we investigate the nature and local character of the domain wall in the hot-deformed Nd-Fe-B and correlate it to the microstructure in the material. Misalignment in magnetization of individueal grains from the interaction domain direction can be seen. We gratefully acknowledge funding from the DFG via the CRC/TRR 270 and used resources of the Advanced Light Source (contract no. DE-AC02-05CH11231).
Keywords: Rare earth magnets; X-ray magnetic imaging; interaction domains; permanent magnets; nanocrystalline