High spin polarization and spin splitting in equiatomic quaternary CoFeCrAl Heusler alloy

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

Equiatomic quaternary Heusler alloys: A material perspective for spintronic applications

“…8 Enamullah et al [52] have also observed that if two or more atoms possess nearly same electronegativity values, some degree of disorder could be expected in the crystal structure. They gave the example of CoMnCrAl, CoFeCrAl [9] and Co2Cr1-xFexAl [53] alloys, where disorder is found between Cr and Al sites. On the basis of the data available in the literature, they proposed an empirical relation between the relative electronegativity values and the occurrence of disorder.…”

“…Bainsla et al [9] further investigated the magnetic properties of CoFeCrAl alloy and found that TC value was more than 400 K.…”

“…was obtained for CoFeCrAl at 5 K by Luo et al [47], which was found to be in agreement with their theoretically predicted value of 2.0 µB/f.u. Bainsla et al [9] also investigated the magnetic properties of CoFeCrAl alloy by performing the pressure dependent isothermal magnetization measurements at 8 K.…”

“…was obtained at 300 K by them for CoRuFeSi. Bainsla et al [11], investigated the magnetic properties of the CoRuFeZ (Z = Si and Ge) alloys by studying the isothermal magnetization curves at different temperatures CoRuFeGe respectively, in which the former is found to be the highest among all the known equiatomic quaternary Heusler alloys [7][8][9][10][11]45,46,52,63]. The relatively high value of TC in these alloys gives a possibility of retaining high spin polarization at elevated temperatures.…”

“…Since, the prediction of HMF nature in NiMnSb [6], Heusler alloys have received a special attention due to the reasons mentioned above. In the large family of Heusler alloys, generally Co based alloys show relatively high Curie temperature and high spin polarization [7][8][9][10][11][12][13][14][15][16].…”