Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 18: Magnetic Coupling Phenomena

MA 18.2: Vortrag

Dienstag, 1. April 2014, 14:15–14:30, HSZ 403

Exchange bias up to room temperature in the antiferromagnetic bulk hexagonal Mn3Ge — •Jin-Feng Qian, Ajaya Nayak, Guido Kreiner, Walter Schnelle, and Clauida Felser — Nöthnitzer Str. 40, 01187 Dresden , Germany

This work reports an exchange bias (EB) effect up to room temperature in the binary intermetallic bulk compound Mn3.04Ge0.96. The sample annealed at 700 K crystallizes in a tetragonal structure with ferrimagnetic ordering, whereas, the sample annealed at 1073 K crystallizes in a hexagonal structure with antiferromagnetic ordering. The hexagonal Mn3.04Ge0.96 sample exhibits an EB of around 70 mT at 2 K that continues with a non-zero value up to room temperature. The exchange anisotropy is proposed to be originating from the exchange interaction between the triangular antiferromagnetic host and the embedded ferrimagnetic like clusters. The ferrimagnetic clusters develop when excess Mn atoms occupy empty Ge sites in the original triangular antiferromagnet structure of Mn3Ge.