Skip to main content

Ferromagnetism and Persistent Currents in Finely Dispersed Highly Oriented Pyrolytic Graphite Samples

Synthesis of finely dispersed graphite powders is described and results of their investigations by the methods of electron microscopy and magnetometry are presented. The samples have been prepared from crystal highly oriented pyrolytic graphite by grinding in an inert atmosphere for a long time with subsequent annealing at 400°C for 24 h in air or in vacuum. It is demonstrated that annealing of the powder in vacuum leads to a considerable increase in the ferromagnetic component associated with the formation of edge defects of zigzag type. The phenomenon of magnetic flux trapping is manifested in the samples annealed both in air and in vacuum upon cooling down to 10 K in a magnetic field that is indicative of the formation of superconducting regions in the samples.

This is a preview of subscription content, access via your institution.

References

  1. Y. Cao, V. Fatemi, S. Fang, et al., Nature, 556, 43 (2018).

    ADS  Article  Google Scholar 

  2. Y. Cao, V. Fatemi, A. Demir, et al., Nature, 556, 80 (2018).

    ADS  Article  Google Scholar 

  3. M. Saad, I. F. Gilmutdinov, A. G. Kiiamov, et al., JETP Lett., 107, 37 (2018).

    ADS  Article  Google Scholar 

  4. T. Scheike, W. Böhlmann, P. Esquinazi, et al., Adv. Mater., 24, 43 (2012).

    Article  Google Scholar 

  5. P. Esquinazi, T. T. Heikkilä, Y. V. Lysogorskiy, et al., JETP Lett., 5, 336 (2014).

    ADS  Article  Google Scholar 

  6. K. He, A. W. Robertson, Y. Fan, et al., ACS Nano, 9, 4786 (2015).

    Article  Google Scholar 

  7. P. D. Esquinazi, ed., Basic Physics of Functionalized Graphite, Springer Series in Materials Science, Vol. 244, Springer (2016).

  8. Y. Wang, Y. Huang, Y. Song, et al., Nano Lett., 9, 220 (2009).

    ADS  Article  Google Scholar 

  9. J. Haruyama, Electronics, 2, 368 (2013).

    Article  Google Scholar 

  10. L. Xie, X. Wang, J. Lu, et al., Appl. Phys. Lett., 98, 193113 (2011).

    ADS  Article  Google Scholar 

  11. K. Tada, J. Haruyama, H. X. Yang, et al., Appl. Phys. Lett., 99, 183111 (2011).

    ADS  Article  Google Scholar 

  12. X. Miao, S. Tongay, and A. F. Hebard, Carbon, 50, 1614 (2012).

    Article  Google Scholar 

  13. C. Wang and D. Diao, Appl. Phys. Lett., 102, 052402 (2013).

    ADS  Article  Google Scholar 

  14. T. Makarova and F. Palacio, Carbon-Based Magnetism: An Overview of the Magnetism of Metal-Free Carbon-Based Compounds and Materials, Elsevier (2006).

Download references

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to M. Saad.

Additional information

Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 7, pp. 58–61, July, 2018.

Rights and permissions

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark

Cite this article

Saad, M., Gilmutdinov, I.F., Rogov, A.M. et al. Ferromagnetism and Persistent Currents in Finely Dispersed Highly Oriented Pyrolytic Graphite Samples. Russ Phys J 61, 1247–1251 (2018). https://doi.org/10.1007/s11182-018-1525-0

Download citation

  • Received:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s11182-018-1525-0

Keywords

  • graphite
  • aggregate
  • interface
  • edge defect
  • ferromagnetism
  • magnetic flux trapping