Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 616, Issue -, Pages 449-453Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2014.07.165
Keywords
Half-metallicity; Heusler alloy; Ferrimagnetism; First-principles calculations
Categories
Funding
- National Natural Science Foundation of China [11174030, 51271071]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry
- Ministry of education program for New Century Excellent Talents [NCET-10-0126]
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The electronic structures and magnetic properties of quaternary Heusler alloys CoFeTiZ (Z = Si, Ge, Sn) have been studied using first-principles calculations. It has been found that CoFeTiSi and CoFeTiGe are half-metallic ferrimagnets, while CoFeTiSn is a quasi half-metallic ferrimagnet. The total moment in unit cell for CoFeTiZ (Z = Si, Ge, Sn) alloys follows the Slater-Pauling behavior with the total number of valence electrons minus 24. The origin of the magnetism, band gap, and the effect of atom Z on the band gap and the half-metallicity of the alloys have been discussed in detail. The half-metallic property for CoFeTiSi and CoFeTiGe can be retained when their lattice constants are changed in a large range. CoFeTiSn alloy can transform from a quasi half-metallic to a half-metallic alloy by employing a proper compression stress. (C) 2014 Elsevier B.V. All rights reserved.
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