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MA: Fachverband Magnetismus

MA 50: Permanent Magnets

MA 50.9: Vortrag

Donnerstag, 19. März 2020, 17:15–17:30, HSZ 101

Manipulation of intrinsic properties of CeFe₁₁Ti: Experiment and Theory — •Semih Ener¹, Anna Galler², Fernando Maccari¹, Imants Dirba¹, Konstantin P. Skokov¹, Silke Biermann², Leonid Pourovskii², and Oliver Gutfleisch¹ — ¹Functional Materials, Department of Materials Science, Technische Universität Darmstadt, Darmstadt/Germany — ²Centre de Physique Théorique, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau/France

The abundance of rare-earth (RE) elements like Nd and Sm motivates researchers to look for alternative free-RE (like Ce, Pr, La) material systems. Interesting candidates are ThMn₁₂-phases where the RE concentration is lower in comparison to the benchmark material systems Nd₂Fe₁₄B and Sm₂Fe₁₇. The CeFe₁₂ phase is not stable in bulk form, so additional elements need to be substituted for Fe to stabilize the phase. Among the alternative stabilization elements, titanium is a promising candidate due to its low composition ratio (approx. 7 at.% for stabilization of the ThMn₁₂-phase in bulk) for ternary concentrations. In this work, we carried out composition and thermal treatment optimization for the Ce_1+xFe₁₁Ti series and investigated the magnetic properties under positive and negative pressures. In addition to the experiments, first-principles dynamical mean-feld theory (DMFT) calculations were carried out. Intrinsic properties were investigated at different temperatures and will be presented in this work.

This work is supported by the DFG-ANR project RE-MAP (Project No. 316912154).