Exchange bias up to room temperature in antiferromagnetic hexagonal Mn3Ge

Qian, J. F.; Nayak, A. K.; Kreiner, G.; Schnelle, W.; Felser, C.

doi:10.1088/0022-3727/47/30/305001

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Exchange bias up to room temperature in antiferromagnetic hexagonal Mn₃Ge

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Qian, J. F.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Nayak, A. K.
Ajaya Nayak, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Kreiner, G.
Guido Kreiner, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Schnelle, W.
Walter Schnelle, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Felser, C.
Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Qian, J. F., Nayak, A. K., Kreiner, G., Schnelle, W., & Felser, C. (2014). Exchange bias up to room temperature in antiferromagnetic hexagonal Mn₃Ge. Journal of Physics D: Applied Physics, 47(30): 305001, pp. 1-5. doi:10.1088/0022-3727/47/30/305001.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0024-BF7D-D

Abstract

Mn3.04Ge0.96 has a hexagonal crystal structure, which can be stabilized by high-temperature annealing, and shows antiferromagnetic order with a small ferromagnetic component of less than 0.1 mu(B) and a coercivity of 0.45 T. In the ordered phase, magnetization curves M(H) exhibit an exchange bias of 62 mT at T = 2K after field cooling, which is observable up to room temperature. The exchange anisotropy is suggested to originate from the exchange interaction between the host of triangular-antiferromagnetic Mn3Ge units and embedded ferrimagnetic-like clusters. Such clusters develop when excess Mn atoms occupy empty Ge sites in the original triangular-antiferromagnetic structure of Mn3Ge.