Andreev Reflection Spectroscopy Study of Spin Polarization in Co2Cr(Fe)Al Heusler Alloys
V. Haškováa, P. Szabó a, J. Kováč a, T. Ryba b, Z. Vargová c and R. Varga b
aCentre of Low Temperature Physics at Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 04001 Košice, Slovakia
bInst. Phys., Fac. Sci., UPJS, Park Angelinum 9, 04154 Košice, Slovakia
cDep. Inorg. Chem., Fac. Sci., UPJS, Park Angelinum 9, 04154 Košice, Slovakia
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The present paper is dealing with the experimental study of the influence of Fe substitution on the Curie temperature and spin polarization in Co2CrAl Heusler alloys. A recently successfully introduced new rapid quenching method has been used for the preparation of Co2CrAl and Co2Cr0.6Fe0.4Al ribbon samples. The Curie temperatures have been determined from magnetization measurements being 378 K for Co2CrAl and much above 400 K for Co2Cr0.6Fe0.4Al. The spin polarization parameter P0 of the studied samples has been estimated from point-contact Andreev reflexion spectroscopy measurements. In pure Co2CrAl P0= 0.5-0.9, and in the case of Co2Cr0.6Fe0.4Al P0= 0.4-0.9. Hence, it is shown that Fe substitution of Cr in Co2Cr1-xFexAl Heusler alloys at a concentration of x=0.4 significantly increase the Curie temperature without marked influence on the spin polarization.

DOI: 10.12693/APhysPolA.127.377
PACS numbers: 72.25.Ba, 74.45.+c,