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Half-metallic ferromagnetism and Ru-induced localization in quaternary Heusler alloy CoRuMnSi
- Source :
- Journal of Magnetism and Magnetic Materials. 502:166536
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- We report a combined theoretical and experimental investigation of half-metallic ferromagnetism in equiatomic quaternary Heusler alloy CoRuMnSi. Room temperature XRD analysis reveals that the alloy crystallizes in L21 disorder instead of pristine Y-type structure due to 50% swap disorder between the tetrahedral sites, i.e., Co and Ru atoms. Magnetization measurements reveal a net magnetization of 4 $\mu_B$ with Curie temperature of ~780 K. Resistivity measurement reveals the presence of localization effect below 35 K while above 100 K, a linear dependence is observed. Resistivity behavior indicates the absence of single magnon scattering, which indirectly supports the half-metallic nature. The majority spin band near the Fermi level clearly indicates the overlap of flat eg bands with sharply varying conduction bands that are responsible for the localization. In-depth analysis of the projected atomic d-orbital character of band structure reveals unusual bonding, giving rise to the flat eg bands purely arising out of Ru ions. Co-Ru swap disorder calculations indicate the robustness of half-metallic nature, even when the structure changes from Y-type to L21-type, with no major change in the net magnetization of the system. Thus, robust half-metallic nature, stable structure, and high Curie temperature make this alloy quite a promising candidate to be used as a source of highly spin-polarized currents in spintronic applications.<br />Comment: 9 pages, 8 figures
- Subjects :
- 010302 applied physics
Condensed Matter - Materials Science
Materials science
Spintronics
Condensed matter physics
Fermi level
Materials Science (cond-mat.mtrl-sci)
FOS: Physical sciences
02 engineering and technology
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
Electronic, Optical and Magnetic Materials
Condensed Matter::Materials Science
Magnetization
symbols.namesake
Ferromagnetism
Electrical resistivity and conductivity
0103 physical sciences
symbols
Density of states
Curie temperature
Condensed Matter::Strongly Correlated Electrons
0210 nano-technology
Electronic band structure
Subjects
Details
- ISSN :
- 03048853
- Volume :
- 502
- Database :
- OpenAIRE
- Journal :
- Journal of Magnetism and Magnetic Materials
- Accession number :
- edsair.doi.dedup.....5cdbb596b819ff306269e718b72f9efd