$\mathrm{C}{\mathrm{o}}_2\mathrm{F}{\mathrm{e}}_{1-\mathrm{x}}\mathrm{C}{\mathrm{r}}_{\mathrm{x}}\mathrm{Si}$ Heusler Alloys : A promising material for spintronics application

Abstract

In this article, we investigated the effect of Cr substitution in place of Fe on the structural, magnetic and transport properties of $\mathrm{C}{\mathrm{o}}_2\mathrm{FeSi}$ alloy. A comprehensive structural analysis is done using X-ray diffraction (XRD) and extended X-ray absorption fine structure (EXAFS) spectroscopy. Quaternary Heusler compounds $\mathrm{C}{\mathrm{o}}_2\mathrm{F}{\mathrm{e}}_{1-\mathrm{x}}\mathrm{C}{\mathrm{r}}_{\mathrm{x}}\mathrm{Si}$ with Cr content (x = 0.1, 0.3, 0.5) were found to crystallize in cubic structure. The synchrotron based EXAFS studies reveal that the anti-site disorder increases with the increase in Cr concentration. The saturation magnetization values in all the alloys are found to be less than those expected from the Slater-Pauling rule, which may be due to the some inherent disorder. A detailed resistivity analysis in the temperature range of 5-300 K is done, taking into account different scattering mechanisms. The residual resistivity ratio is found to decrease with increasing Cr concentration. A disorder induced resistivity minimum due to weak localization effect is seen for x = 0.5. The resistivity measurements also indicate that the half-metallic character survives upto 100 K for x = 0.1, whereas the alloys with x= 0.3 and 0.5 show signature of half- metallic nature even at higher temperatures. First principles calculation done with a more robust exchange correlation functional (namely HSE-06) confirms the half metallicity in the entire concentration range. Theoretically simulated band gap and magnetic moments compliment the experimental findings and are compared wherever possible. All these properties make $\mathrm{C}{\mathrm{o}}_2\mathrm{F}{\mathrm{e}}_{1-\mathrm{x}}\mathrm{C}{\mathrm{r}}_{\mathrm{x}}\mathrm{Si}$ a promising material for spintronics application.

arXiv comment14 pages, 9 figures

References in corpus (7)

• Geometric, electronic, and magnetic structure of Co${}_2$FeSi: Curie temperature and magnetic moment measurements and calculations
• Monolayer MXenes: promising half-metals and spin gapless semiconductors
• Investigation of Co${}_2$FeSi: The Heusler compound with Highest Curie Temperature and Magnetic Moment
• Half-Metallic Ferromagnetism in the Heusler Compound Co${}_2$FeSi revealed by Resistivity, Magnetoresistance, and Anomalous Hall Effect measurements
• High spin polarization in CoFeMnGe quaternary Heusler alloy
• Direct evidence for minority spin gap in the Co2MnSi Heusler alloy
• Structural, electronic, magnetic and transport properties of equiatomic quaternary Heusler Alloy CoRhMnGe: Theory and Experiment

Cited by in corpus (7)

• Experimental and Theoretical Investigation on the Possible Half-metallic Behaviour of Equiatomic Quaternary Heusler Alloys: CoRuMnGe and CoRuVZ (Z = Al, Ga)
• Spin Gapless Semiconducting Nature in Co-rich Co1+xFe1-xCrGa: Insight and Advancements
• Coexisting structural disorder and robust spin-polarization in half-metallic FeMnVAl
• Half-metallic ferromagnetism and Ru-induced localization in quaternary Heusler alloy CoRuMnSi
• Neutron diffraction and magnetic properties of Co${}_2$Cr${}_{1-x}$Ti${}_x$Al Heusler alloys
• Disorder-mediated quenching of magnetization in NbVTiAl: Theory and Experiment
• Effect of Point Defects and Lattice Distortions on the Structural, Electronic, and Magnetic properties of Co${}_2$MnAl Heusler alloy