Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 2: Magnetic Materials I

MA 2.3: Vortrag

Montag, 7. März 2016, 10:00–10:15, H31

Influence of Ce and Co substitution on the magnetocrystalline anisotropy of (NdCe)₂(FeCo)₁₄B single crystals — •Bahar Fayyazi, Konstantin Skokov, Christoph Schwöbel, and Oliver Gutfleisch — Material Science, Technische Universität Darmstadt, 64287 Darmstadt, Germany

Due to recent pressures on the availability and cost of rare-earth (RE) metals, especially for Nd and Dy which are essential for high performance Nd₂Fe₁₄B -type permanent magnets, it is a priority to develop materials that rely less on scarce RE-elements. Cerium is the most abundant and low cost rare-earth element without significant supply restrictions. At the same time, Nd₂Fe₁₄B and Ce₂Fe₁₄B adopt the same crystal structure and many research efforts around the world are directed toward substitution of Nd, Tb and Dy in Nd₂Fe₁₄B -type permanent magnets by Ce (so-called rare balance magnets) without significant concurrent reduction of remanent magnetization, coercivity and Curie temperature, what, in turn, is a really challenging task. In this work, we report on magnetocrystalline anisotropy and spontaneous magnetization of (NdCe)₂(FeCo)₁₄B single crystals. Anisotropy constants K₁, K₂ and K₃ were exstracted from experimental field dependences of magnetization measured along [001] [100] and [110] crystallographic directions. We also explored how the change of the composition affects effective magnetic moment, temperature of spin-reorientation transition and Curie temperature.