Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 49: POSTER II

MA 49.28: Poster

Donnerstag, 19. März 2015, 15:00–18:00, Poster A

Travelling solvent floating zone growth of Ni-Mn-Sn Heusler alloys — •Seunghyun Khim¹, Christian C. F. Blum¹, Maria Belesi¹, Ahmad Omar¹, Bernd Büchner^1,2, and Sabine Wurmehl^1,2 — ¹Leibniz Institute for Solid State and Materials Research, Helmholtzstrasse 20, 01069 Dresden, Germany — ²Institute for Solid State Physics, TU Dresden, 01069 Dresden, Germany

We present a travelling solvent floating zone growth of Heusler alloys Ni₂Mn_1+xSn_1−x. In certain Mn-rich compositions, this alloy undergoes a martensitic transition from a high temperature cubic L2₁ to a low temperature orthorhombic/tetragonal phase. Owing to a strong entanglement between the structure and magnetism, multifunctional properties such as shape memory effects, exchange bias, inverse magnetocaloric, and giant magnetoresistance are realized in this alloy. As the structure and magnetic properties are highly sensitive to disorder, microstructure and an inclusion of a secondary phase, a high quality single crystal is an ideal platform to investigate the intrinsic nature of those properties along with the anisotropies of the material. In this motivation, we have grown Ni₂Mn_1+xSn_1−x compounds by using the travelling solvent floating zone technique. We will discuss the evolution of structural and magnetic properties with varying the Mn/Sn ratio combining different techniques as nuclear magnetic resonance.