Complex angular dependence of exchange bias on (001) epitaxial NiO-Co bilayers

  • S. Dubourg
  • J. F. BoboEmail author
  • B. Warot
  • E. Snoeck
  • J. C. Ousset
Epitaxial systems


We have sputter-deposited NiO-Co bilayers on MgO(001) substrates. NiO and Co grow epitaxially on MgO and reproduce its fcc structure. The high quality of our samples, in terms of flatness and crystallographic coherence of the interface, allows the observation of an additional fourfold magnetic anisotropy term by standard magnetometry. This term is induced by interfacial interaction assigned to the same origin as exchange bias. Additional measurements of exchange bias azimuthal dependence versus the crystallographic axes of the film plane reveal unusual behaviors with several sign changes related to this fourfold anisotropy.


Spectroscopy Neural Network Anisotropy Coherence Complex System 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. W.H. Meiklejohn, C.P. Bean, Phys. Rev. 105, 904 (1957) CrossRefGoogle Scholar
  2. K. Takano, R.H. Kodama, A.E. Berkowitz, W. Cao, G. Thomas, Phys. Rev. Lett. 79, 1130 (1997) CrossRefGoogle Scholar
  3. A.P. Malozemoff, Phys. Rev. B 35, 3679 (1987) CrossRefGoogle Scholar
  4. N.C. Koon, Phys. Rev. Lett. 78, 4865 (1997) CrossRefGoogle Scholar
  5. D. Mauri, H.C. Siegmann, P.S. Bagus, E. Kay, J. Appl. Phys. 62, 3047 (1987) CrossRefGoogle Scholar
  6. M.D. Stiles, R.D. McMichael, Phys. Rev. B 59, 3722 (1999) CrossRefGoogle Scholar
  7. J.F. Bobo, S. Dubourg, E. Snoeck, B. Warot, P. Baules, J.C. Ousset, J. Magn. Magn. Mater. 206, 118 (1999) CrossRefGoogle Scholar
  8. S. Dubourg, N. Negre, B. Warot, E. Snoeck, M. Goiran, J.C. Ousset, J.F. Bobo, J. Appl. Phys. 87, 4936 (2000) CrossRefGoogle Scholar
  9. S. Dubourg, J.F. Bobo, B. Warot, E. Snoeck, J.C. Ousset, Phys. Rev. B 64, 054416 (2001) CrossRefGoogle Scholar
  10. J. Nogues, D. Lederman, T.J. Moran, I.K. Schuller, Phys. Rev. Lett. 76, 4624 (1996) CrossRefPubMedGoogle Scholar
  11. C. Leigthon, L. Noguès, H. Suhl, I. Schuller, Phys. Rev. B 60, 12837 (1999) CrossRefGoogle Scholar
  12. B. Warot, E. Snoeck, P. Baulès, J.C. Ousset, M.J. Casanove, S. Dubourg, J.F. Bobo, J. Appl. Phys. 89, 5414 (2001) CrossRefGoogle Scholar
  13. C. Laï, H. Matsuyama, R. White, T. Anthony, G. Bush, J. Appl. Phys. 79, 6389 (1996) CrossRefGoogle Scholar
  14. J. Nogués, I.K. Schuller, J. Magn. Magn. Mater. 192, 203 (1999) CrossRefGoogle Scholar
  15. S.G.E. te Velthuis, A. Berger, G.P. Felcher, B.K. Hill, E.D. Dahlberg, J. Appl. Phys. 87, 5046 (2000) CrossRefGoogle Scholar
  16. T. Ambrose, R. Sommer, C. Chien, Phys. Rev. B 56, 83 (1997) CrossRefGoogle Scholar
  17. H. Xi, R. White, J. Appl. Phys. 86, 5169 (1999) CrossRefGoogle Scholar
  18. A. Hoffmann, M. Grimsditch, J.E. Pearson, J. Nogués, W.A.A. Macedo, I.K. Schuller, Phys. Rev. B 67, 220406(R) (2003) CrossRefGoogle Scholar
  19. E. Stoner, E. Wohlfarth, Philos. Trans. R. Soc. London Ser. A 240, 74 (1948) Google Scholar
  20. Z. Qian, J.M. Sivertsen, J.H. Judy, J. Appl. Phys. 83, 6825 (1998) CrossRefGoogle Scholar
  21. Y. Tang, X. Zhou, X. Chen, B. Liang, W. Zhan, J. Appl. Phys. 88, 2054 (2000) CrossRefGoogle Scholar
  22. R.P. Michel, A. Chaiken, C.T. Wang, L.E. Johnson, Phys. Rev. B 58, 8566 (1998) CrossRefGoogle Scholar
  23. S. Dubourg, J.F. Bobo, B. Warot, E. Snoeck, J.C. Ousset, Mat. Res. Symp. Proc. 674, T1-6 (2001) Google Scholar
  24. M.J. Pechan, D. Bennet, N. Teng, C. Leighton, J. Nogués, I.K. Schuller, Phys. Rev. B 65, 064410 (2002) CrossRefGoogle Scholar
  25. T. Mewes, H. Nembach, M. Ricart, S.O. Demokritov, J. Fassbender, B. Hillebrands, Phys. Rev. B 65, 224423 (2002) CrossRefGoogle Scholar

Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2005

Authors and Affiliations

  • S. Dubourg
    • 1
  • J. F. Bobo
    • 1
    Email author
  • B. Warot
    • 2
  • E. Snoeck
    • 2
  • J. C. Ousset
    • 2
  1. 1.LNMH-CNRS, ONERA, 2 avenue Edouard BelinToulouseFrance
  2. 2.CEMES CNRS, 29 rue Jeanne MarvigToulouseFrance

Personalised recommendations