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20 April 2024 |
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High spin polarization and large spin splitting in equiatomic quaternary CoFeCrAl Heusler alloy | | Lakhan Bainsla
; A. I. Mallick
; A. A. Coelho
; A. K. Nigam
; B. S. D. Ch. S. Varaprasad
; Y. K. Takahashi
; Aftab Alam
; K. G. Suresh
; K. Hono
; | | Date: |
22 Jan 2015 | | Abstract: | In this paper, we investigate CoFeCrAl alloy by means of various experimental
techniques and ab-initio calculations to look for half-metallic nature. The
alloy is found to exist in the cubic Heusler structure, with presence of B2
ordering. Saturation magnetization (MS) value of about 2 Bohr magneton/f.u. is
observed at 8 K under ambient pressure, which is in good agreement with the
Slater-Pauling rule. MS values are found to be independent of pressure, which
is a prerequisite for half-metals. The ab-initio electronic structure
calculations predict half-metallic nature for the alloy with a spin slitting
energy of 0.31 eV. Importantly, this system shows a high current spin
polarization value of 0.67 [with error of 0.02], as deduced from the point
contact Andreev reflection (PCAR) measurements. Linear dependence of electrical
resistivity with temperature indicates the possibility of reasonably high spin
polarization at elevated temperatures (~150 K) as well. All these suggest that
CoFeCrAl is a promising material for the spintronic devices. | | Source: | arXiv, 1501.5599 | | Services: | Forum | Review | PDF | Favorites | |
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