Magnetic and structural properties of ferromagnetic Fe{sub 5}PB{sub 2} and Fe{sub 5}SiB{sub 2} and effects of Co and Mn substitutions
- Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)
Crystallographic and magnetic properties of Fe{sub 5}PB{sub 2}, Fe{sub 4}CoPB{sub 2}, Fe{sub 4}MnPB{sub 2}, Fe{sub 5}SiB{sub 2}, Fe{sub 4}CoSiB{sub 2}, and Fe{sub 4}MnSiB{sub 2} are reported. All adopt the tetragonal Cr{sub 5}B{sub 3} structure-type and are ferromagnetic at room temperature with easy axis of magnetization along the c-axis. The spin reorientation in Fe{sub 5}SiB{sub 2} 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 suggest 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}PB{sub 2} and Fe{sub 5}SiB{sub 2}, with negative thermal expansion seen along the c-axis of Fe{sub 5}SiB{sub 2}. First principles calculations of the magnetic properties of Fe{sub 5}SiB{sub 2} and Fe{sub 4}MnSiB{sub 2} are reported. The results, including the magnetic moment and anisotropy, are in good agreement with experiment.
- OSTI ID:
- 22492848
- Journal Information:
- Journal of Applied Physics, Vol. 118, Issue 16; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
Superconductivity and phase diagram in a transition metal doped Zr 5 Ge 3 compound
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journal | June 2018 |
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANISOTROPY
CHROMIUM BORIDES
COBALT
CRYSTALLOGRAPHY
CURIE POINT
MAGNETIC MOMENTS
MAGNETIC PROPERTIES
MAGNETIZATION
MANGANESE
PHOSPHIDES
SILICIDES
SPIN
TEMPERATURE RANGE 0273-0400 K
THERMAL EXPANSION