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Spin polarization of Fe-rich ferromagnetic compounds in Ru2−xFexCrSi Heusler alloys |
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| Authors: | Iduru Shigeta Osamu Murayama Alexander Brinkman Yukio Tanaka Hans Hilgenkamp |
| Institution: | a Faculty of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente, 7500 AE Enschede, The Netherlands b Department of Physics and Astronomy, Kagoshinma University, Kagoshima 890-0065, Japan c Department of Applied Physics, Nagoya University, Nagoya 464-8603, Japan |
| Abstract: | We report spin polarization P of Ru2−xFexCrSi Heusler alloys by the Andreev reflection technique. Ru2−xFexCrSi with L21-type structure and saturation magnetic moment of  per formula unit is theoretically predicted to be half-metals in the wide range of the composition x. We had clarified that the experimental results of saturation magnetic moment in Fe-rich compounds had coincided with the theoretical prediction. Therefore, we have measured the differential conductance of Ru2−xFexCrSi/Pb planar-type junctions. The P value of Ru2−xFexCrSi was determined by fitting the differential conductance with the modified Blonder-Tinkham-Klapwijk theory. We have found that the behavior of P for Ru2−xFexCrSi was independent of the composition x in the Fe-rich region; P=0.53 for both of x=1.5 and 1.7. The spin polarization is the similar value to Co-based Heusler alloys. |
| Keywords: | A Alloys A Interfaces A Magnetic materials A Superconductors D Transport properties |
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