τ-MnAl with high coercivity and saturation magnetization
In this paper, high purity τ-Mn54Al46 and Mn54−xAl46Cxalloys were successfully prepared using conventional arc-melting, melt-spinning, and heat treatment process. The magnetic and the structural properties were examined using x-ray diffraction (XRD), powder neutron diffraction and magnetic measureme...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC
2014-12-01
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| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/1.4903773 |
| _version_ | 1828422838051143680 |
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| author | J. Z. Wei Z. G. Song Y. B. Yang S. Q. Liu H. L. Du J. Z. Han D. Zhou C. S. Wang Y. C. Yang A. Franz D. Többens J. B. Yang |
| author_facet | J. Z. Wei Z. G. Song Y. B. Yang S. Q. Liu H. L. Du J. Z. Han D. Zhou C. S. Wang Y. C. Yang A. Franz D. Többens J. B. Yang |
| author_sort | J. Z. Wei |
| collection | DOAJ |
| description | In this paper, high purity τ-Mn54Al46 and Mn54−xAl46Cxalloys were successfully prepared using conventional arc-melting, melt-spinning, and heat treatment process. The magnetic and the structural properties were examined using x-ray diffraction (XRD), powder neutron diffraction and magnetic measurements. A room temperature saturation magnetization of 650.5 kAm-1, coercivity of 0.5 T, and a maximum energy product of (BH)max = 24.7 kJm-3 were achieved for the pure Mn54Al46 powders without carbon doping. The carbon substituted Mn54−xAl46Cx, however, reveals a lower Curie temperature but similar saturation magnetization as compared to the carbon-free sample. The electronic structure of MnAl shows that the Mn atom possesses a magnetic moment of 2.454 μB which results from strong hybridization between Mn-Al and Mn-Mn. We also investigated the volume and c/a ratio dependence of the magnetic moments of Mn and Al. The results indicate that an increase in the intra-atomic exchange splitting due to the cell volume expansion, leads to a large magnetic moment for the Mn atom. The Mn magnetic moment can reach a value of 2.9 μB at a volume expansion rate of ΔV/V ≈ 20%. |
| first_indexed | 2024-12-10T15:52:27Z |
| format | Article |
| id | doaj.art-8590f7fad63942ad902bfa83c18e4897 |
| institution | Directory Open Access Journal |
| issn | 2158-3226 |
| language | English |
| last_indexed | 2024-12-10T15:52:27Z |
| publishDate | 2014-12-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj.art-8590f7fad63942ad902bfa83c18e48972022-12-22T01:42:45ZengAIP Publishing LLCAIP Advances2158-32262014-12-01412127113127113-1110.1063/1.4903773012412ADVτ-MnAl with high coercivity and saturation magnetizationJ. Z. Wei0Z. G. Song1Y. B. Yang2S. Q. Liu3H. L. Du4J. Z. Han5D. Zhou6C. S. Wang7Y. C. Yang8A. Franz9D. Többens10J. B. Yang11State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, P.R. ChinaState Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, P.R. ChinaState Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, P.R. ChinaState Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, P.R. ChinaState Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, P.R. ChinaState Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, P.R. ChinaState Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, P.R. ChinaState Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, P.R. ChinaState Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, P.R. ChinaHelmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, GermanyHelmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, GermanyState Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, P.R. ChinaIn this paper, high purity τ-Mn54Al46 and Mn54−xAl46Cxalloys were successfully prepared using conventional arc-melting, melt-spinning, and heat treatment process. The magnetic and the structural properties were examined using x-ray diffraction (XRD), powder neutron diffraction and magnetic measurements. A room temperature saturation magnetization of 650.5 kAm-1, coercivity of 0.5 T, and a maximum energy product of (BH)max = 24.7 kJm-3 were achieved for the pure Mn54Al46 powders without carbon doping. The carbon substituted Mn54−xAl46Cx, however, reveals a lower Curie temperature but similar saturation magnetization as compared to the carbon-free sample. The electronic structure of MnAl shows that the Mn atom possesses a magnetic moment of 2.454 μB which results from strong hybridization between Mn-Al and Mn-Mn. We also investigated the volume and c/a ratio dependence of the magnetic moments of Mn and Al. The results indicate that an increase in the intra-atomic exchange splitting due to the cell volume expansion, leads to a large magnetic moment for the Mn atom. The Mn magnetic moment can reach a value of 2.9 μB at a volume expansion rate of ΔV/V ≈ 20%.http://dx.doi.org/10.1063/1.4903773 |
| spellingShingle | J. Z. Wei Z. G. Song Y. B. Yang S. Q. Liu H. L. Du J. Z. Han D. Zhou C. S. Wang Y. C. Yang A. Franz D. Többens J. B. Yang τ-MnAl with high coercivity and saturation magnetization AIP Advances |
| title | τ-MnAl with high coercivity and saturation magnetization |
| title_full | τ-MnAl with high coercivity and saturation magnetization |
| title_fullStr | τ-MnAl with high coercivity and saturation magnetization |
| title_full_unstemmed | τ-MnAl with high coercivity and saturation magnetization |
| title_short | τ-MnAl with high coercivity and saturation magnetization |
| title_sort | τ mnal with high coercivity and saturation magnetization |
| url | http://dx.doi.org/10.1063/1.4903773 |
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