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

• 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

References

• [1] T. Graf, C. Felser, S.S.P. Parkin, Prog. Solid State Chem. 39, 1 (2011), doi: 10.1016/j.progsolidstchem.2011.02001
• [2] A. Hirohata, M. Kuchi, N. Tezuka, K. Inomata, J.S. Claydon, Y.B. Xu, G. van der Laan, Curr. Opinion Solid State Mater. Sci. 10, 93 (2006), doi: 10.1016/j.cossms.2006.11.006
• [3] B. Hernando, J.L. Sánchez Llamazares, J.D. Santos, V.M. Prida, D. Baldomir, D. Serantes, R. Varga, J. González, Appl. Phys. Lett. 92, 132507 (2008), doi: 10.1063/1.2904625
• [4] L. Hongzhi, Z. Zhiyong, M. Li, X. Shifeng, L. Heyan, Q. Jingping, L. Yangxian, W. Guangheng, J. Phys. D Appl. Phys. 40, 7121 (2007), doi: 10.1088/0022-3727/40/22/039
• [5] G.J. Strijkers, Y. Ji, F.Y. Yang, C.L. Chien, J.M. Byers, Phys. Rev. B 63, 104510 (2001), doi: 10.1103/PhysRevB.63.104510
• [6] A. Pleceník, M. Grajcar, Š. Beňačka, P. Seidel, A. Pfuch, Phys. Rev. B 49, 10016 (1994), doi: 10.1103/PhysRevB.49.10016

Identifiers

DOI

10.12693/APhysPolA.127.377