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Andreev Reflection Spectroscopy Study of Spin Polarization in Co₂Cr(Fe)Al Heusler Alloys

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Hašková V., Szabó P., Kováč J., Ryba T., Vargová Z., Varga R.

Acta Physica Polonica A

2015

vol. 127

issue 2

377-378

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 Co₂Cr_{0.6}Fe_{0.4}Al ribbon samples. The Curie temperatures have been determined from magnetization measurements being 378 K for Co₂CrAl and much above 400 K for Co₂Cr_{0.6}Fe_{0.4}Al. The spin polarization parameter P₀ of the studied samples has been estimated from point-contact Andreev reflexion spectroscopy measurements. In pure Co₂CrAlP₀ = 0.5 - 0.9, and in the case of Co₂Cr_{0.6}Fe_{0.4}AlP₀ = 0.4 - 0.9. Hence, it is shown that Fe substitution of Cr in Co₂Cr_{1-x}FeₓAl Heusler alloys at a concentration of x=0.4 significantly increase the Curie temperature without marked influence on the spin polarization.

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1 Acta Physica Polonica A

1 2015

1 Hašková V.

1 Kováč J.

1 Ryba T.

1 Szabó P.

1 Varga R.

1 Vargová Z.

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Andreev Reflection Spectroscopy Study of Spin Polarization in Co₂Cr(Fe)Al Heusler Alloys