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O: Fachverband Oberflächenphysik

O 91: [MA] Poster II

O 91.65: Poster

Freitag, 30. März 2012, 11:00–14:00, Poster A

Thermomagnetic properties improved by self-organized flower-like phase separation of ferromagnetic Co₂Dy_0.5Mn_0.5Sn. — •Michael Schwall¹, Peter Klaer², Hans-Joachim Elmers², and Benjamin Balke¹ — ¹Institute of Inorganic Chemistry and Analytical Chemistry, Johannes Gutenberg - University, Mainz — ²Institute of Physics, Johannes Gutenberg - University, Mainz

A thermodynamically stable phase separation of Co₂Dy_0.5Mn_0.5Sn into the Heusler compound Co₂MnSn and Co₈Dy₃Sn₄ is induced by rapid cooling from the liquid phase. The phase separation forms an ordered flower-like structure on the microscale. The increased scattering of phonons at the phase boundaries reduces thermal conductivity and thus improves thermoelectric and spincaloric properties.