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Open AccessArticle

Beating Thermal Deterioration of Magnetization with Mn4C and Exchange Bias in Mn–C Nanoparticles

1
College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, China
2
Functional Nanopowders Materials Department, Korea Institute of Materials Science, Changwon 51508, Korea
3
Engineering Ceramics Research Group, Korea Institute of Materials Science, Changwon 51508, Korea
*
Authors to whom correspondence should be addressed.
Nanomaterials 2018, 8(12), 1056; https://doi.org/10.3390/nano8121056
Received: 24 October 2018 / Revised: 11 December 2018 / Accepted: 13 December 2018 / Published: 15 December 2018
The magnetization of most materials decreases with increasing temperature due to thermal deterioration of magnetic ordering. Here, we show that Mn4C phase can compensate the magnetization loss due to thermal agitation. The Mn–C nanoparticles containing ferrimagnetic Mn4C and other Mn–C/Mn-O phases were prepared by using the traditional arc-discharge method. A positive temperature coefficient of magnetization (~0.0026 Am2 kg−1 K−1) and an exchange bias up to 0.05 T were observed in the samples. We ascribe the exchange bias to the co-existence of ferrimagnetic Mn4C/Mn3O4 and antiferromagnetic α-Mn(C)/MnO phases. The positive temperature coefficient of magnetization of the samples was ascribed to the presence of Mn4C phase, which is considered as a Néel’s P-type ferrimagnet. View Full-Text
Keywords: exchange bias; nanoparticles; Mn4C; arc discharge exchange bias; nanoparticles; Mn4C; arc discharge
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MDPI and ACS Style

Si, P.-Z.; Wang, X.-Y.; Ge, H.-L.; Qian, H.-D.; Park, J.; Yang, Y.; Li, Y.-S.; Choi, C.-J. Beating Thermal Deterioration of Magnetization with Mn4C and Exchange Bias in Mn–C Nanoparticles. Nanomaterials 2018, 8, 1056.

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