Magnetic and structural properties of ferromagnetic Fe<sub>5</sub>PB<sub>2</sub> and Fe<sub>5</sub>SiB<sub>2</sub> and effects of Co and Mn substitutions [electronic resource]
Crystallographic and magnetic properties of Fe<sub>5</sub>PB<sub>2</sub>, Fe<sub>4</sub>CoPB<sub>2</sub>, Fe<sub>4</sub>MnPB<sub>2</sub>, Fe<sub>5</sub>SiB<sub>2</sub>, Fe<sub>4</sub>CoSiB<...
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| Online Access: |
Online Access (via OSTI) |
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| Corporate Author: | |
| Format: | Government Document Electronic eBook |
| Language: | English |
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Washington, D.C. : Oak Ridge, Tenn. :
United States. Department of Energy. Office of Energy Efficiency and Renewable Energy ; distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
2015.
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| Summary: | Crystallographic and magnetic properties of Fe<sub>5</sub>PB<sub>2</sub>, Fe<sub>4</sub>CoPB<sub>2</sub>, Fe<sub>4</sub>MnPB<sub>2</sub>, Fe<sub>5</sub>SiB<sub>2</sub>, Fe<sub>4</sub>CoSiB<sub>2</sub>, and Fe<sub>4</sub>MnSiB<sub>2</sub> are reported. All adopt the tetragonal Cr<sub>5</sub>B<sub>3</sub> structure-type and are ferromagnetic at room temperature with easy axis of magnetization along the c-axis. The spin reorientation in Fe<sub>5</sub>SiB<sub>2</sub> is observed as an anomaly in the magnetization near 170 K, and is suppressed by substitution of Co or Mn for Fe. The silicides are found to generally have larger magnetic moments than the phosphides, but the data suggests smaller magnetic anisotropy in the silicides. Cobalt substitution reduces the Curie temperatures by more than 100 K and ordered magnetic moments by 16-20%, while manganese substitution has a much smaller effect. This suggests Mn moments align ferromagnetically with the Fe and that Co does not have an ordered moment in these structures. Anisotropic thermal expansion is observed in Fe<sub>5</sub>PB<sub>2</sub> and Fe<sub>5</sub>SiB<sub>2</sub>, with negative thermal expansion seen along the c-axis of Fe<sub>5</sub>SiB<sub>2</sub>. First principles calculations of the magnetic properties of Fe<sub>5</sub>SiB<sub>2</sub> and Fe<sub>4</sub>MnSiB<sub>2</sub> are reported. The results, including the magnetic moment and anisotropy, and are in good agreement with experiment. |
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| Item Description: | Published through SciTech Connect. 10/22/2015. "VT0504000" "CEVT004" Journal of Applied Physics 118 16 ISSN 0021-8979 AM. Michael A. McGuire; David S. Parker. |
| Physical Description: | Article No. 163903 : digital, PDF file. |