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New ACS Omega publication on anomalous Nernst effect in Fe4–xGexN thin films
2026/02/11
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FM group again part of the Erfinderlabor
2026/02/10
40th Erfinderlabor – High Performance Materials and Recycling – A Contradiction?
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![(a) Hysteresis and initial magnetization curves for the low and high Hc samples. (b) 3D atom probe tomography (APT) data comparing low Hc and high Hc samples. Top: 3D APT reconstructions of low Hc and high Hc samples, respectively, with Co (dark blue), Ce (red), Cu(light blue); Middle: 2D Cu concentration maps from 10 nm thick slices; Bottom: 1D concentration profiles extracted from cylinders (5 nm diameter, 100 nm length). (c) Magnetic imaging of Ce(Co0.8Cu0.2)5.4 high Hc sample: Fresnel Lorentz Transmition Electron Microscopy image, showing black and white contrast at the positions of zigzag domain walls (DW), nucleated under applied field B = 1T. The image is recorded in magnetic-field-free conditions at a defocus of 1 mm. (d) Magnetic induction map of a DW region indicated by a yellow dotted square in (c). Arrows and colours indicate projected in-plane magnetic field directions. (e) Schematic representations of the coercivity mechanism in Ce(Co0.8Cu0.2)5.4 obtained by micromagnetic simulation: High Hc sample shows pronounced chemical contrast and preferred orientation of Cu-poor cylindrical cells leads to strong pinning at Cu-rich cell boundaries. Low Hc sample demonstrates weaker compositional contrast and random cell orientation reduce pinning effectiveness. The DW (dashed line) propagates more easily through the less segregated structure.]()
![(a) Hysteresis and initial magnetization curves for the low and high Hc samples. (b) 3D atom probe tomography (APT) data comparing low Hc and high Hc samples. Top: 3D APT reconstructions of low Hc and high Hc samples, respectively, with Co (dark blue), Ce (red), Cu(light blue); Middle: 2D Cu concentration maps from 10 nm thick slices; Bottom: 1D concentration profiles extracted from cylinders (5 nm diameter, 100 nm length). (c) Magnetic imaging of Ce(Co0.8Cu0.2)5.4 high Hc sample: Fresnel Lorentz Transmition Electron Microscopy image, showing black and white contrast at the positions of zigzag domain walls (DW), nucleated under applied field B = 1T. The image is recorded in magnetic-field-free conditions at a defocus of 1 mm. (d) Magnetic induction map of a DW region indicated by a yellow dotted square in (c). Arrows and colours indicate projected in-plane magnetic field directions. (e) Schematic representations of the coercivity mechanism in Ce(Co0.8Cu0.2)5.4 obtained by micromagnetic simulation: High Hc sample shows pronounced chemical contrast and preferred orientation of Cu-poor cylindrical cells leads to strong pinning at Cu-rich cell boundaries. Low Hc sample demonstrates weaker compositional contrast and random cell orientation reduce pinning effectiveness. The DW (dashed line) propagates more easily through the less segregated structure.]()
New Acta Materialia publication
2026/02/02
Direct observation of nanoscale pinning centers in Ce(Co0.8Cu0.2)5.4 permanent magnets
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![a) Microstructure of the magnet obtained by electron microscopy. (b) Optical Kerr microscopy image, the black areas correspond to the demagnetized part of the magnet. (c,d,e) High-resolution transmission electron microscopy images showing nanostructure of the magnet. (f) Electron holography, different colours correspond to different orientation of magnetization.]()
![a) Microstructure of the magnet obtained by electron microscopy. (b) Optical Kerr microscopy image, the black areas correspond to the demagnetized part of the magnet. (c,d,e) High-resolution transmission electron microscopy images showing nanostructure of the magnet. (f) Electron holography, different colours correspond to different orientation of magnetization.]()
How defects make permanent magnets even more efficient
2026/01/28
TU researchers contribute to a publication in Nature Communications
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New Advanced Materials Publication with National Institute for Material Science (NIMS – Japan)
2026/01/22
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Towards engineering the perfect defect in high-performing permanent magnets
2026/01/20
In our latest study, we examined Sm2(Co,Fe,Cu,Zr)17 high-performance magnet with perfect thermal and chemical stability.
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PhD Defense Konrad Opelt
2025/12/10
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Dean’s Prize for Excellence in Research
2025/12/05
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Media review: TU Professor Gutfleisch on Rare Earth Elements
2025/11/06
Why Rare Earth Magnets Are So Hard to Replace
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Gram-Scale Synthesis of Fe3N Nanoparticles via a One-Pot Thermal Decomposition Route: Implications for Magnetic Fluid Hyperthermia Applications
2025/10/22
Published in ACS Applied Nano Materials
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Degradable Magnetic Composites from Recycled Nd-Fe-B Magnets for Soft Actuation and Sensing
2025/09/25
Now Published in Advanced Robotics Research
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Picture: privat“Magnets are key components for a successful energy transition”
2025/08/22
Professor Oliver Gutfleisch on the upcoming JEMS 2025 magnetism conference
This coming Sunday (24 August) marks the start of the six-day JEMS 2025, or Joint European Magnetic Symposia, the leading conference on magnetism in Europe. The event is being organised by the Functional Materials department at TU Darmstadt, headed by Professor Oliver Gutfleisch.
Functional Materials
News from Funtional Materials
News from Funtional Materials
Contact
Prof. Dr. Oliver Gutfleisch
oliver.gutfleisch@tu-...
work +49 6151 16-22150
fax +49 6151 16-22145
Work
L2|07 111
Peter-Grünberg-Str. 16
64287
Darmstadt
