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Growth of Stable Bilayer CrO 2 /MgB 2 Films by Pulsed Laser Deposition

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Abstract

We have used the pulsed laser deposition (PLD) technique followed by post-annealing process with magnesium vapor at 700∘C for 30 min to grow a high-quality CrO2/MgB2 bilayer prepared on Al2O3 (1102) single crystal. The X-ray diffraction patterns showed high-quality orientated growth of MgB2 phase. The obtained films were approximately 300 nm thick and had lateral dimensions of 5×5 mm2. SQUID magnetometry, magneto-optical Faraday microscopy, and magneto-transport techniques were used in order to measure the critical current density (JC) that was found to be 7– 9×106 A/cm2 at 15 K. Transition temperature (TC) for the films was ∼37 K. The obtained magnetic hysteresis loops at low temperatures exhibited asymmetry with respect to H = 0. This can be explained in terms of pinning of flux lines in the films due to magnetic interaction with the ferromagnetic CrO2 layer.

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Acknowledgments

The authors are thankful to King Abdulaziz City for Science & Technology, Saudi Arabia for funding this work under The National Plan for Science, Technology and Innovation Project No. (10-NAN1171-02). We also thank S. Treiber and J. Albrecht for the work on Magneto optical experiment.

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Authors and Affiliations

  1. Department of Physics and Astronomy, College of Science, King Saud University, P.O. Box 2455, Riyadh, Saudi Arabia

    N. S. Alzayed, M. Shahabuddin, A. El-Naggar, S. E. Qaid, Jafar M. Parakkandy, M. S. Shah & Niyaz Ahmad Madhar

  2. Max-Planck-Institute (FKF), Hesienbergstrasse 1, 70569, Stuttgart, Germany

    S. Soltan

  3. Department of Physics, Faculty of Science, Helwan University, 11798, Helwan, Cairo, Egypt

    S. Soltan

  4. Electrical Engineering Department, Czestochowa University Technology, Armii Krajowej 17, 42-217, Czestochowa, Poland

    I. V. Kityk

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  1. N. S. Alzayed
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  2. S. Soltan
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  3. M. Shahabuddin
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  4. A. El-Naggar
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  5. I. V. Kityk
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  6. S. E. Qaid
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  7. Jafar M. Parakkandy
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  8. M. S. Shah
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  9. Niyaz Ahmad Madhar
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Correspondence to N. S. Alzayed.

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Alzayed, N.S., Soltan, S., Shahabuddin, M. et al. Growth of Stable Bilayer CrO 2 /MgB 2 Films by Pulsed Laser Deposition. J Supercond Nov Magn 28, 387–390 (2015). https://doi.org/10.1007/s10948-014-2884-6

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  • DOI: https://doi.org/10.1007/s10948-014-2884-6

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