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Effect of Fe substitution on the magnetic properties of half-Heusler alloy CoCrAl |
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| Authors: | Hongzhi Luo Heyan Liu Yangxian Li Guangheng Wu Chengbao Jiang |
| Affiliation: | a School of Material Science and Engineering, Hebei University of Technology, Tianjin 300130, PR China b Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, PR China c School of Material Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, PR China |
| Abstract: | The effect of Fe substitution for the vacant site in half-Heusler alloy CoCrAl is studied. A series of single phase CoFexCrAl (x=0.0, 0.25, 0.5, 0.75 and 1.0) alloys has been successfully synthesized. The lattice constant is found to increase almost linearly with increasing Fe content, indicating Fe atoms enter the lattice of CoCrAl instead of existing as a secondary phase. When Fe entering the vacant site, spin polarization occurs and the alloy turns from a semimetal in CoCrAl to a half-metallic ferromagnet (HMF) in CoFeCrAl. This is due to the reconstruction of the energy band with Fe substitution. The Curie temperature and saturation magnetic moments are enhanced and increase monotonically with increasing Fe content. The variation of the spin moment follows the Slater-Pauling curve and agrees with the theoretical calculation as well. |
| Keywords: | 71.20.Be 71.20.Lp 75.50.Cc |
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