Atom probe tomography to advance understanding of magnetic materials

This project is a joint project of the De Magnete group and the Atom Probe Tomography group, and was initiated  by MPIE’s participation in the CRC TR 270 HOMMAGE. We also benefit from additional collaborations with the “Machine-learning based data extraction from APT” project and the Defect Chemistry and Spectroscopy group. 

Magnetic materials are key components of energy conversion devices and thus improving the material’s magnetic properties is critical to enhance the sustainability of power generation and conversion. We use atom probe tomography (APT) to study the relationship between the microstructure on the nanoscale and the properties of various soft and hard magnetic materials. As demonstrated by experiments and machine-learning aided analysis, the changes in magnetic properties, e.g., magnetization, coercivity, Curie temperature and domain structure, are closely related to the variation of magnets’ microstructure. Our results help guide the design of magnetic materials.

Several magnetic systems are currently under active investigation: NdFeB, Sm(Co,Fe), CeCoCu magnets as hard magnetic alloys and CoFeNiTaAl high-entropy alloys as soft magnets.

Publication References

1.
Rao, Z.; Dutta, B.; Körmann, F.; Ponge, D.; Li, L.; He, J.; Stephenson, L.; Schäfer, L.; Skokov, K.; Gutfleisch, O. et al.; Raabe, D.; Li, Z.: Unveiling the mechanism of abnormal magnetic behavior of FeNiCoMnCu high-entropy alloys through a joint experimental - theoretical study. Physical Review Materials 4, 014402 (2020)
2.
Rao, Z.; Dutta, B.; Körmann, F.; Lu, W.; Zhou, X.; Liu, C.; Kwiatkowski da Silva, A.; Wiedwald, U.; Spasova, M.; Farle, M. et al.; Ponge, D.; Gault, B.; Neugebauer, J.; Raabe, D.; Li, Z.: Beyond Solid Solution High‐Entropy Alloys: Tailoring Magnetic Properties via Spinodal Decomposition. Advanced Functional Materials 31 (7), 2007668 (2021)

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