Berlin 2012 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 35: Magnetic Heusler Compounds I

MA 35.7: Vortrag

Mittwoch, 28. März 2012, 17:00–17:15, H 0112

Structural and magnetic properties of Mn₂Rh_1−xCo_xSn and Mn_2+xRh_1−xSn Heusler alloys — •Olga Meshcheriakova¹, Juergen Winterlik¹, Gerhard Fecher^1,2, and Claudia Felser^1,2 — ¹Institute for Inorganic and Analytical Chemistry, Johannes Gutenberg - University, Mainz — ²Max Planck Institute for Chemical Physics of Solids, Dresden, Germany

Mn₂-based Heusler compounds are promising candidates for spintronic applications as they are known to crystallize with cubic and tetragonal structures or exhibit cubic-tetragonal phase transitions. Sn-containing compounds have only a small lattice mismatch with MgO thus providing higher symmetry correlation between magnetic film and tunneling barrier. Quaternary Mn₂Rh_1−xCo_xSn and Mn_2+xRh_1−xSn Heusler alloys have been synthesized with a step of x=0.1 and their magnetic properties were experimentally investigated. In the present work the structural and magnetic properties are discussed depending on the Rh and Co content. The first series undergoes a cubic-tetragonal transition at x=0.5, while the latter one experiences a hexagonal-tetragonal change of structure. The presence of Co increases the Curie temperature keeping the magnetic moment unchanged.

This work is supported by the Graduate School of Excellence Materials Science in Mainz (MAINZ).