We have demonstrated that with increasing the exchange splitting of the conduction band of a ferromagnet and, respectively, of the degree of the spin polarization, the probability of transmission of the superconducting Cooper pairs through the S/F interface decreases. We have concluded that the spin imbalance plays a key role in the processes taking place at the interface between a superconductor and a ferromagnet with spin-polarized conduction electrons. We have studied the superconducting spin-valve effect in F1/F2/S heterostructures containing the Heusler alloy Co2Cr1 – xFexAly as one of two ferromagnetic (F1 or F2) layers. We have used the Heusler alloy layer in two roles: as a weak ferromagnet on the place of the F2 layer and as a half-metal on the place of the F1 layer. In the first case, we have obtained the full switching between the normal and superconducting states is realized with the dominant aid of the long-range triplet component of the superconducting pair condensate which occurs at the perpendicular mutual orientation of magnetizations. In the second case, we have observed separation between the superconducting transitions for perpendicular and parallel configurations of magnetizations reaching 0.5 K. We have also found good agreement between our experimental data and theoretical results.
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REFERENCES
K. B. Efetov, I. A. Garifullin, A. F. Volkov, and K. Westerholt, in Magnetic Heterostructures, Advances and Perspectives in Spin-Structures and Spintransport, Springer Tracts Mod. Phys. 227, 251 (2007).
M. G. Blamire and J. W. A. Robinson, J. Phys.: Condens. Matter 26, 253201 (2014).
J. Linder and J. W. A. Robinson, Nat. Phys. 11, 307 (2015).
W. E. Pickett and J. S. Moodera, Phys. Today 54, 39 (2001).
V. Yu. Irkhin and M. I. Katsel’son, Phys. Usp. 37, 659 (1994).
S. Oh, D. Youm, and M. R. Beasley, Appl. Phys. Lett. 71, 2376 (1997).
P. V. Leksin, N. N. Garif’yanov, I. A. Garifullin, J. Schumann, H. Vinzelberg, V. Kataev, R. Klingeler, O. G. Schmidt, and B. Büchner, Appl. Phys. Lett. 97, 102505 (2010).
Ya. V. Fominov, A. A. Golubov, T. Yu. Karminskaya, M. Yu. Kupriyanov, R. G. Deminov, and L. R. Tagirov, JETP Lett. 91, 308 (2010).
P. V. Leksin, N. N. Garif’yanov, I. A. Garifullin, Ya. V. Fominov, J. Schumann, Y. Krupskaya, V. Kataev, O. G. Schmidt, and B. Büchner, Phys. Rev. Lett. 109, 057005 (2012).
I. A. Garifullin, P. V. Leksin, N. N. Garif’yanov, A. A. Kamashev, Ya. V. Fominov, J. Schumann, Y. Krupskaya, V. Kataev, O. G. Schmidt, and B. Büchner, J. Magn. Magn. Mater. 373, 18 (2015).
S. Takahashi, H. Imamura, and S. Maekawa, Phys. Rev. Lett. 82, 3911 (1999).
S. Mironov and A. I. Buzdin, Phys. Rev. B 92, 184506 (2015).
Y. V. Kudryavtsev, V. N. Uvarov, V. A. Oksenenko, Y. P. Lee, J. B. Kim, Y. H. Hyun, K. W. Kim, J. Y. Rhee, and J. Dubowik, Phys. Rev. B 77, 195104 (2008).
N. I. Kourov, A. V. Korolev, N. V. Marchenkov, A. V. Lukojanov, and K. A. Belozerova, Phys. Solid State 55, 927 (2013).
I. Galanakis, P. H. Dederichs, and N. Papanikolaou, Phys. Rev. B 66, 174429 (2002).
A. A. Kamashev, P. V. Leksin, J. Schumann, V. Kataev, J. Thomas, T. Gemming, B. Büchner, and I. A. Garifullin, Phys. Rev. B 96, 024512 (2017).
A. Singh, S. Voltan, K. Lahabi, and J. Aarts, Phys. Rev. X 5, 021019 (2015).
P. V. Leksin, N. N. Garif’yanov, A. A. Kamashev, A. A. Validov, Ya. V. Fominov, J. Schumann, V. Kataev, J. Thomas, B. Büchner, and I. A. Garifullin, Phys. Rev. B 93, 100502(R) (2016).
P. V. Leksin, A. A. Kamashev, J. Schumann, V. Kataev, J. Thomas, B. Büchner, and I. A. Garifullin, Nano Res. 9, 1005 (2016).
R. J. Soulen, Jr., J. M. Byers, M. S. Osofsky, B. Nadgorny, T. Ambrose, S. F. Cheng, P. R. Broussard, C. T. Tanaka, J. Nowak, J. S. Moodera, A. Barry, and J. M. D. Coey, Science (Washington, DC, U. S.) 282, 85 (1998).
G. J. Strijkers, Y. Ji, F. Y. Yang, C. L. Chien, and J. M. Byers, Phys. Rev. B 63, 104510 (2001).
P. V. Leksin, N. N. Garif’yanov, A. A. Kamashev, Ya. V. Fominov, J. Schumann, C. Hess, V. Kataev, B. Büchner, and I. A. Garifullin, Phys. Rev. B 91, 214508 (2015).
A. A. Kamashev, N. N. Garif’yanov, A. A. Validov, J. Schumann, V. Kataev, B. Büchner, Ya. V. Fominov, and I. A. Garifullin, Phys. Rev. B 100, 134511 (2019).
S. Husain, S. Akansel, A. Kumar, P. Svedlindh, and S. Chaudhary, Sci. Rep. 6, 20452322 (2016).
P. V. Leksin, R. I. Salikhov, I. A. Garifullin, H. Vinzelberg, V. Kataev, R. Klingeler, L. R. Tagirov, and B. Büchner, JETP Lett. 90, 64 (2009).
A. A. Kamashev, P. V. Leksin, N. N. Garif’yanov, A. A. Validov, J. Schumann, V. Kataev, B. Büchner, and I. A. Garifullin, J. Magn. Magn. Mater. 459, 7 (2018).
M. Yu. Kuprianov and V. F. Lukichev, Sov. Phys. JETP 67, 1163 (1988).
K. Halterman and M. Alidoust, Phys. Rev. B 94, 064503 (2016).
A. A. Kamashev, N. N. Garif’yanov, A. A. Validov, J. Schumann, V. Kataev, B. Büchner, Ya. V. Fominov, and I. A. Garifullin, Beilstein J. Nanotechnol. 10, 1458 (2019).
ACKNOWLEDGMENTS
We are grateful to Dr. Vladislav Kataev, Prof. Bernd Büchner, Dr. Joachim Schumann (Leibniz-Institut für Festkörper-und Werkstoffforschung, Dresden), to Dr. Pavel Leksin, Dr. Nadir Garif’yanov, and Dr. Aidar Validov (Zavoisky Physical–Technical Institute, Russian Academy of Sciences), and to Dr. Yakov Fominov (Landau Institute for the Theoretical Physics, Russian Academy of Sciences) for cooperation in the reviewed studies.
Funding
The reviewed studies, whose main results were reported in [16, 23, 26, 29], were supported by the Russian Foundation for Basic Research, project no. 17-02-00229.
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Kamashev, A.A., Garifullin, I.A. Proximity Effect in Heterostructures Based on a Superconductor/Half-Metal System. Jetp Lett. 113, 194–206 (2021). https://doi.org/10.1134/S0021364021030012
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DOI: https://doi.org/10.1134/S0021364021030012