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Interface Effects in Tunneling Magnetoresistive Systems

  • Branko Stahl
  • Horst Hahn
  • Holger Schmitt
  • Mohammad Ghafari
  • Sarbari Bhattacharya
Chapter
Part of the Lecture Notes in Physics book series (LNP, volume 593)

Abstract

In tunneling magneto resistance (TMR) devices the electronic and magnetic properties of the interfaces between the ferromagnetic metals and the insulating spacer layer influence the effective scattering potential for the conduction electrons. As this is especially relevant for structural and magnetic defects and inhomogeneities in the interface region, a non-destructive chemical, magnetic and electronic characterization with a sub-monolayer sensitivity is of importance.

In the present work, Mössbauer spectroscopy as a nuclear probe method was used to study the oxidation of the Fe-Al interface in an ultra high vacuum (UHV) system under successive oxidation steps. The formation of Fe-Al spinel and Fe oxide phases as well as a smoothening of the metal-insulator interface after annealing at around 230°C are identified. After a first pronounced reaction, the oxidation is observed to occur in constant amounts though the partial pressure and the time intervals varied significantly in the successive oxidation steps.

Keywords

High Resolution Transmission Electron Microscopy Isomer Shift Ultra High Vacuum Electronic Band Structure Interface Zone 
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.

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References

  1. 1.
    G.A. Prinz: Science 282 (1998) 1660CrossRefGoogle Scholar
  2. 2.
    R. Meservey, P.M. Tedrow, P. Fulde: Phys. Rev. Lett. 25(18) (1970) 1270–72CrossRefADSGoogle Scholar
  3. 3.
    P.M. Tedrow, R. Meservey: Phys. Rev. Lett. 26(4) (1971) 192–195CrossRefADSGoogle Scholar
  4. 4.
    M. Julliere: Phys. Lett. 54A(3) (1972) 225–226ADSGoogle Scholar
  5. 5.
    P. Grünberg, R. Schreiber, Y. Pang, M.B. Brodsky, H. Sowers: Phys. Rev. Lett. 57 (1986) 2442; F. Saurenbach, U. Walz, L. Hinchey, P. Grünberg, W. Zinn: J. Appl. Phys. 62 (1988) 3473CrossRefADSGoogle Scholar
  6. 6.
    M.N. Baibich, J.M. Broto, A. Fert, F. Nguyen Van Dau, F. Petroff, P. Eitenne, G. Creuzet, A. Friederich, J. Chazelas: Phys. Rev. Lett. 61 (1988) 2472CrossRefADSGoogle Scholar
  7. 7.
    J.S. Moodera, L.R. Kinder, T.M. Wong, R. Meservey, Phys. Rev. Lett. 74(16) (1995) 3272–3276CrossRefADSGoogle Scholar
  8. 8.
    S. Yuasa, T. Sato, E. Tamura, Y. Suzuki, H. Yamamori, K. Ando, T. Katayama: Europhys. Lett. 52(3) (2000) 344–350CrossRefADSGoogle Scholar
  9. 9.
    J.M. De Teresa, A. Barthelemy, A. Fert, J.P. Contour, R. Lyonnet, F. Montaigne, P. Seneor, A. Vaures: Phys. Rev. Lett. 82 (1999) 4288–4291CrossRefADSGoogle Scholar
  10. 10.
    Y.M. Tsipenyuk: Nuclear methods in science and technology (Institute of Physics Publishing, Bristol 1997)Google Scholar
  11. 11.
    T. Bonchev, A. Jordanov, A. Minkova: Nucl. Instr. Meth. 70 (1969) 36–40CrossRefGoogle Scholar
  12. 12.
    S. Kruijer, W. Keune, M. Dobler, H. Reuther: Appl. Phys. Lett. 70 (1997) 2696CrossRefADSGoogle Scholar
  13. 13.
    G. Walter, R. Heitzmann, D.M. Rück, B. Stahl, R. Gellert, O. Geiss, G. Klingelhöfer, E. Kankeleit: Nucl. Instr. Meth. B 113 (1996) 167–170CrossRefADSGoogle Scholar
  14. 14.
    A.A. Novakova, A.P. Kuprin: Nucl. Instr. Meth. B (1993) 213–214Google Scholar
  15. 15.
    G. Belozerskii, C. Bohm, T. Ekdahl, D. Liljequist: Corros. Sci. 22(9) (1982) 831CrossRefGoogle Scholar
  16. 16.
    T. Yang, A. Krishnan, N. Benczer-Koller, G. Bayreuther: Phys.Rev.Lett. 48(18) (1982)Google Scholar
  17. 17.
    A.S. Kamzin, L.A. Grigor’ev: Sov. Phys. Tech. Phys. 35 (1990) 840Google Scholar
  18. 18.
    B. Stahl, R. Gellert, M. Müller, E. Kankeleit, A. Kamzin: Phys. Rev. Lett., 84 (2000) 5632CrossRefADSGoogle Scholar
  19. 19.
    D. Liljequist, T. Ekdahl, U. Baverstam: Nucl. Instr. Meth. 155 (1978) 529CrossRefGoogle Scholar
  20. 20.
    D. Liljequist: Nucl. Instr. Meth. B 174 (2001) 351–360CrossRefADSGoogle Scholar
  21. 21.
    B. Stahl, E. Kankeleit: Nucl. Instr. Meth. B 122 (1997) 149–161CrossRefADSGoogle Scholar
  22. 22.
    A.J. Freeman, Ru-qian Wu: J. Mag. Mag. Mat. 100 (1991) 497–514CrossRefADSGoogle Scholar
  23. 23.
    U. Gradmann: J. Mag. Mag. Mat. 100 (1991) 481–496CrossRefADSGoogle Scholar
  24. 24.
    T. Shinjo: Surf. Sc. Rep. 12(2) (1991)Google Scholar
  25. 25.
    M. Sato, H. Kikuchi, K. Kobayashi: IEEE Trans. Mag. 35(5) (1999) 2946–2948CrossRefADSGoogle Scholar
  26. 26.
    S. Cardoso, V. Gehanno, R. Ferreira, P. P. Freitas: IEEE Trans. Mag. 35(5) (1999) 2952–2954CrossRefADSGoogle Scholar
  27. 27.
    R.C. Sousa, Il Sun, V. Soares, P.P. Freitas, A. Kling: Appl. Phys. Lett. 73 (1998) 3288CrossRefADSGoogle Scholar
  28. 28.
    S.S.P. Parkin: The 43th annual Conference of MMM proceedings, GA-03 (1998) 255Google Scholar
  29. 29.
    T.E. Clark, F.B. Mancoff, S.X. Wang, B.M. Clemens, R. Sinclair: IEEE Trans. Mag.35(5) (1999) 2922–2924CrossRefADSGoogle Scholar
  30. 30.
    T. Campbell, R. Kalia, A. Nakano, P. Vashishta, S. Ogata, S. Rodgers: Phys. Rev. Lett. 82(24) (1999) 4866–4869CrossRefADSGoogle Scholar
  31. 31.
    J.C. Sanchez-Lopez, A.R. Gonzalez-Elipe, A. Fernandez: J. Mat. Res. 13(3) (1998) 703–710ADSCrossRefGoogle Scholar
  32. 32.
    E. Murad, J. H. Johnston: in Mössbauer Spectroscopy Applied to Inorganic Chemistry, Vol. 2 (ed. G.J. Long, Plenum Press, New York and London (1987)Google Scholar
  33. 33.
    S. Maekawa, U. Gäfvert: IEEE Trans. Magn. MAG-18 (1982) 707–708CrossRefADSGoogle Scholar
  34. 34.
    Y. Suezawa, Y. Gondo: Proc. Int. Symp. Phys. Magn. Mater, ed. M. Takahashi, S. Naekawa, Y. Gondo, N. Nose, World Sci. Singapore (1987) 303–306Google Scholar
  35. 35.
    J. Nowa, J. Rauluszkiewicz: J. Magn. Magn. Mater. 109 (1992) 79–90CrossRefADSGoogle Scholar
  36. 36.
    T. Mitsuzuka, K. Matsuda et al.: J. Appl. Phys. 85(8) (1999) 5807CrossRefADSGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2002

Authors and Affiliations

  • Branko Stahl
    • 1
    • 2
  • Horst Hahn
    • 1
  • Holger Schmitt
    • 1
  • Mohammad Ghafari
    • 1
  • Sarbari Bhattacharya
    • 1
  1. 1.Fachbereich Material- und GeowissenschaftenTU DarmstadtDarmstadtGermany
  2. 2.Institut für NanotechnologieForschungszentrum KarlsruheKarlsruheGermany

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