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

• Authors: V. Hašková , P. Szabó , J. Kováč , T. Ryba , Z. Vargová , R. Varga
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

72.25.Ba; 74.45.+c; 77.80.bg

Discipline

• 72.25.Ba: Spin polarized transport in metals
• 74.45.+c: Proximity effects; Andreev reflection; SN and SNS junctions
• 77.80.bg: Compositional effects

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2015
• Volume: 127
• Issue: 2
• Pages: 377-378

Dates

published

2015-02

Contributors

author

V. Hašková

• Centre of Low Temperature Physics at Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 04001 Košice, Slovakia

author

P. Szabó

• Centre of Low Temperature Physics at Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 04001 Košice, Slovakia

author

J. Kováč

• Centre of Low Temperature Physics at Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 04001 Košice, Slovakia

author

T. Ryba

• Inst. Phys., Fac. Sci., UPJS, Park Angelinum 9, 04154 Košice, Slovakia

author

Z. Vargová

• Dep. Inorg. Chem., Fac. Sci., UPJS, Park Angelinum 9, 04154 Košice, Slovakia

author

R. Varga

• Inst. Phys., Fac. Sci., UPJS, Park Angelinum 9, 04154 Košice, Slovakia

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Identifiers

DOI

10.12693/APhysPolA.127.377