Exchange bias up to room temperature in the antiferromagnetic bulk hexagonal Mn3Ge

Abstract

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 ferromagnetic 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.

4 pages, 4 figures

References in corpus (2)

• Large zero-field cooled exchange-bias in bulk Mn2PtGa
• Tetragonal phase of epitaxial room-temperature antiferromagnet CuMnAs

Cited by in corpus (9)

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• Large anomalous Nernst and inverse spin-Hall effects in epitaxial thin films of Kagome semimetal Mn${}_3$Ge
• Pressure tuning of the anomalous Hall effect in the chiral antiferromagnet Mn3Ge
• Ab initio theory of the Gibbs free energy and a hierarchy of local moment correlation functions in itinerant electron systems: The magnetism of Mn${}_3$A materials class
• Designing compensated magnetic states in tetragonal Mn3Ge-based alloys
• Strong Magneto-Elastic Coupling in Mn${}_3$X (X = Ge, Sn)