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Cobalt/Cobaltoxide Exchange Bias System for Diluted Ferromagnetic Alloy Films in Superconducting Spin-Valves

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Nanostructures and Thin Films for Multifunctional Applications

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Abstract

The present work reports on the influence of a Cobalt sublayer on a conventional exchange bias CoOx/Cu41Ni59 interface. For superconducting spintronics the ability to exchange bias diluted ferromagnetic alloys is an essential building block, as they have advantages for the application in superconductor-ferromagnet spin-valve heterostructures. The magnetic properties are investigated by SQUID magnetometry and two separate strongly exchange biased signals are observed. The obtained results are compared with predictions of the domain state and spin-glass model of exchange bias.

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Acknowledgments

The authors are grateful to S. Heidemeyer, B. Knoblich, and W. Reiber for assistance in the TEM-sample preparation, additionally to W. Reiber for assistance in RBS-Measurements, and to D. Vieweg for assistance in magnetic measurements.

This work was supported by the Deutsche Forschungsgemeinschaft (DFG) under the Grant No. HO 955/9-1. L.R.T. was supported in part by the Russian Fund for Basic Research (RFBR) under the Grant No. 16-02-01171-a and by the Program of Competitive Growth of Kazan Federal University funded by Russian Government. R.M. was partially supported by the Program of Competitive Growth of Kazan Federal University funded by Russian Government. The magnetic investigations (H.-A. K.v.N.) were partially supported by the Deutsche Forschungsgemeinschaft (DFG) within the Transregional Collaborative Research Center TRR 80 “From Electronics Correlations to Functionality” (Augsburg, Munich).

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Authors and Affiliations

  1. Institute of Electronic Engineering and Nanotechnologies “D. Ghitu”, Academy of Sciences of Moldova, Chisinau, Moldova

    A. S. Sidorenko, V. I. Zdravkov & R.  Morari

  2. Institut für Physik, Universität Augsburg, D-86159, Augsburg, Germany

    D. Lenk, V. I. Zdravkov, R.  Morari, A. Ullrich, C. Müller, H. -A. Krug von Nidda, S. Horn, L. R. Tagirov & R. Tidecks

  3. Solid State Physics Department, Kazan Federal University, 420008, Kazan, Russia

    R.  Morari & L. R. Tagirov

Authors
  1. A. S. Sidorenko
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  2. D. Lenk
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  3. V. I. Zdravkov
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Correspondence to A. S. Sidorenko .

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Editors and Affiliations

  1. Academy of Sciences of Moldova, Chisinau, Moldova

    Ion Tiginyanu

  2. Alecu Russo Balti State University, Balti, Moldova

    Pavel Topala

  3. Laboratory of Nanotechnologies, Academy of Sciences of Moldova, Chisinau, Moldova

    Veaceslav Ursaki

Appendix

Appendix

From the magnetic moment per atom, m at, the saturation magnetic moment, m s, of samples III and IV can be calculated, summing up the saturation magnetic moments m L of the Co and Cu41Ni59 layers of the thin-film heterostructure, according to m L = m at (V L /V mol, L) N A. Here V L is the volume of the respective layer, V mol, L is the molar volume of the material of the layer, and N A is the Avogadro constant. With m at,Cu41Ni59 = 0.14 μ B [72] and m at,Co = 1.7 μ B [73], V mol,Cu41Ni59 = 6.8 cm3 [27], V mol,Co = 6.62 cm3, μ B = 0.9274 · 10-20 emu [27], and considering that the area of sample III and IV is A = 19.75 mm2 and A = 27.0 mm2, respectively, we obtain 1.80 · 10-4 emu and 1.61 · 10-4 emu for m s of sample III and IV, respectively. This is considerably larger than the magnetic moment observed for a magnetic field of 5 kOe in Figs. 9.4 and 9.5, respectively. One has, however, to consider that a large diamagnetic background of the 0.5 mm thick Si substrate is present in such measurements. Therefore, the measured total magnetic moment is lower than that one of the ferromagnetic material. For high magnetic fields, as soon as the ferromagnetic material has reached its saturation magnetization, the m(H) curve becomes a straight line (see, e.g., [27] for a measurement of a single Cu41Ni59 film on a Si substrate). However, in the field range of Figs. 9.4, 9.5 and 9.6 this linear behavior is almost not visible. The reason may be a linear paramagnetic contribution from the CoOx antiferromagnet [74] superimposed to the diamagnetic contribution. Moreover, one has to consider that there are several sources of experimental errors possible in SQUID measurements of small magnetic moments, as discussed in detail by Garcia et al. [75] and Hautot et al. [76].

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Sidorenko, A.S. et al. (2016). Cobalt/Cobaltoxide Exchange Bias System for Diluted Ferromagnetic Alloy Films in Superconducting Spin-Valves. In: Tiginyanu, I., Topala, P., Ursaki, V. (eds) Nanostructures and Thin Films for Multifunctional Applications. NanoScience and Technology. Springer, Cham. https://doi.org/10.1007/978-3-319-30198-3_9

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