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MA: Fachverband Magnetismus

MA 13: Micro- and Nanostructured Magnetic Materials

MA 13.4: Talk

Monday, March 18, 2024, 15:45–16:00, EB 407

Imaging of the 3D magnetic domain structure of a nanostructured Nd-Fe-B bulk magnet using X-ray magnetic tomography — Damian Günzing¹, •Philipp Klaßen¹, Alex Aubert², Lukas Schäfer², Fernando Maccari², Manuel Guizar-Sicairos^3,4, Valerio Scagnoli^5,3, Mirko Holler³, Enrico Bruder², Heiko Wende¹, Konstantin Skokov², Oliver Gutfleisch², Claire Donnelly⁶, and Katharina Ollefs¹ — ¹Faculty of Physics, UDE, Duisburg, GER — ²Materials Science, TU Darmstadt, GER — ³PSI, Villigen, CH — ⁴Institute of Physics, EPFL, Lausanne, CH — ⁵Department of Materials, ETH Zürich, CH — ⁶MPI for Chemical Physics of Solids, Dresden, GER

Nd-Fe-B magnets play a key role for sustainable energy conversion for example in wind turbines or electric motors due to their superior magnetic performance and high energy density. In this talk, we provide insights into the 3D magnetic domain structure of nanostructured Nd-Fe-B magnets obtained by X-ray magnetic tomography. We imaged the magnetic interaction domain structure inside the bulk of a nanostructured hot-deformed anisotropic nanocrystalline Nd₂Fe₁₄B magnet to correlate the crystal and micro structure and the magnetic moment configuration. We demonstrate that surface effects, such as flux-closure domains, do not dominate the magnetic domain pattern at the surface and reveal the complex domain structure in deeper sections of the permanent magnet. We acknowledge funding by CRC TRR 270.

Keywords: permanent magnets; nanostructured Nd-Fe-B; interaction domains; ptychography; tomography