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conferenceseries
.com
Volume 6
Research & Reviews: Journal of Material Sciences
ISSN: 2321-6212
Magnetic Materials 2018
October 22-23, 2018
October 22-23, 2018 | Rome, Italy
3
rd
International Conference on
Magnetism and Magnetic Materials
Structural, electronic, magnetic and transport properties of Co
2
Fe
1-x
Cr
x
Si Heusler alloys
Deepika Rani
1
, Jiban Kangsabanik
1
, K G Suresh
1
, Aftab Alam
1
, N Patra
2
, D Bhattacharyya
2
and
S N Jha
2
1
Indian Institute of Technology Bombay, India
2
Bhabha Atomic Research Centre, India
T
he effect of Cr substitution in place of Fe on the structural, electronic, magnetic and transport properties of the Co
2
FeSi
alloy is studied. A comprehensive structural analysis is done using X-ray diffraction (XRD) and extended X-ray absorption
fine structure (EXAFS) spectroscopy. Quaternary Heusler compounds Co
2
Fe
1-x
Cr
x
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 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 up to 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. All these properties make
Co
2
Fe
1-x
Cr
x
Si a promising material for spintronics.
deepikadabra2013@gmail.comRes. Rev. J Mat. Sci. 2018, Volume 6
DOI: 10.4172/2321-6212-C6-030