Regensburg 2025 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
MA: Fachverband Magnetismus
MA 30: Bulk Materials: Soft and Hard Permanent Magnets
MA 30.3: Talk
Wednesday, March 19, 2025, 16:45–17:00, H18
3D magnetic of interaction domains in nanostructured Nd-Fe-B using X-ray imaging techniques — •P. Klaßen1, D. Günzing2, A. Aubert3, T. Feggeler4, B. Eggert1, J. Neethirajan5, L. Schäfer3, F. Maccari3, M. Guizar-Sicairos6,7, V. Scagnoli8,6, M. Holler6, D. Shapiro2, A. Ditter2, E. Bruder3, H. Wende1, K. Skokov3, O. Gutfleisch3, C. Donnelly5, and K. Ollefs1 — 1Fac. of Phys., UDE, Duisburg GER — 2LBNL, ALS, CA US — 3Mat. Sc., TU Darmstadt GER — 4BNL, NSLS-II, NY US — 5MPI CPfS, Dresden GER — 6PSI, SLS, Villigen CH — 7Inst. of Physics, EPFL, Lausanne CH — 8Dep. of Mat., ETH Zürich CH
Nd-Fe-B magnets play a key role in sustainable energy conversion, for example in wind turbines or electric motors, due to their superior magnetic performance and high energy density. Here, we provide insights into the 3D magnetic domain structure of (therm.) demagnetized nanostructured Nd-Fe-B magnets obtained by X-ray ptychography and tomography at room temperature. We have imaged the magnetic interaction domains inside a hot-deformed, anisotropic, nanocrystalline Nd2Fe14B magnet to correlate the crystal and microstructure and the configuration of the magnetic moments. The combination of hard and soft X-rays enables the comparison of the domain structure between bulk and lamellae and provides detailed insights into the complex magnetic structure in deeper sections of the magnet and down to individual grains, which can be shown to partly exhibit a single-domain state. We gratefully acknowledge funding from the DFG via CRC/TRR 270.
Keywords: permanent magnets; nanocrystalline; Nd-Fe-B; interaction domains; magnetic imaging