Journal of Materials Science

, Volume 46, Issue 13, pp 4638–4645 | Cite as

Morphological and magnetic properties of TiO2/Fe50Co50 composite films

  • A. Kulkarni
  • V. S. K. Chakravadhanula
  • V. Duppel
  • D. Meyners
  • V. Zaporojtchenko
  • T. Strunskus
  • L. Kienle
  • E. Quandt
  • F. FaupelEmail author


Nanocomposites of FeCo and TiO2 with wide range of metal volume fractions (MVFs) were prepared by co-sputtering. High resolution transmission electron microscopy analysis reveals that the microstructure of the nanocomposites depends on the MVF which determines the particle size and separation. FeCo nanoparticles are amorphous at lower MVF whereas crystallites are present at higher MVF. Likewise, the magnetic characteristics of these films depend on the MVF. At low MVF, composite films exhibit superparamagnetism whereas at high MVF, coalescence of crystalline nanoparticles results in the opening up of hysteresis loop. These composite films show a considerable room temperature tunnel magnetoresistance and being proportional to the square of the normalized magnetization (M/Ms)2.


Composite Film Select Area Electron Diffraction Pattern Aged Film Granular Film Langevin Function 



Financial support by the German Science Foundation (DFG) through the Collaborative Research Center (SFB) 677 “Function by Switching”—Project C7 is gratefully acknowledged. The authors thank Prof. Dr. Dr. h. c. Mult. A. Simon for enabling TEM experiments.


  1. 1.
    Gittleman J, Goldstein Y, Bozowski S (1972) Phys Rev B 5:3609CrossRefGoogle Scholar
  2. 2.
    Helman JS, Abeles B (1976) Phys Rev Lett 37:1429CrossRefGoogle Scholar
  3. 3.
    Fujimori H, Ohnuma S, Kobayashi S, Masumoto T (2006) J Magn Magn Mater 304:32CrossRefGoogle Scholar
  4. 4.
    Ohnuma S, Ohnuma M, Fujimori H, Masumoto T (2007) J Magn Magn Mater 310:2503CrossRefGoogle Scholar
  5. 5.
    Inoue J, Maekawa S (1996) Phys Rev B 53:R11927CrossRefGoogle Scholar
  6. 6.
    Yakushiji K, Mitani K, Ernult F, Takanashi K, Fujimori H (2007) Phys Rep 451:1CrossRefGoogle Scholar
  7. 7.
    Vovk A, Golub V, Malkinski L, Kravets A, Pogorily A, Shypil O (2004) J Magn Magn Mater 272Google Scholar
  8. 8.
    Wang C, Guo Z, Rong Y, Hsu TY (2004) Phys Stat Sol C 1(7):1736Google Scholar
  9. 9.
    Song HQ, Mei LM, Zhang YP, Yan SS, XL Ma, Wang Y, Zhang Z, Chen YL (2007) Phys B 388:130CrossRefGoogle Scholar
  10. 10.
    Schürmann U, Hartung W, Takele H, Zaporojtchenko V, Faupel F (2005) Nanotechnology 16:1078CrossRefGoogle Scholar
  11. 11.
    Takele H, Schuermann U, Greve H, Paretkar D, Zaporojtchenko V, Faupel F (2006) Eur Phys J Appl Phys 33:83CrossRefGoogle Scholar
  12. 12.
    Bayliss P (1941) Trans Am Soc Met 29:415Google Scholar
  13. 13.
    Díaz-Ortiz A, Drautz R, Fähnle M, Dosch H, Sanchez JM (2006) Phys Rev B 73:224208CrossRefGoogle Scholar
  14. 14.
    Owen EA, Madoc Jones D (1992) Proc Phys Soc B 67:456CrossRefGoogle Scholar
  15. 15.
    Hattink B, García del Muro M, Konstantinović Z, Batlle X, Labarta A, Varela M (2006) Phys Rev B 73:045418CrossRefGoogle Scholar
  16. 16.
    Honda S, Okada T, Nawate M, Tokumoto M (1997) Phys Rev B 56:22CrossRefGoogle Scholar
  17. 17.
    O’Handley R (1999) Modern magnetic materials. Principles and applications. Wiley Interscience, New YorkGoogle Scholar
  18. 18.
    Xiao G, Chien C (1987) J Appl Phys 61:3308CrossRefGoogle Scholar
  19. 19.
    Granquist C, Buhrman R (1976) J Appl Phys 47:2200CrossRefGoogle Scholar
  20. 20.
    Gong W, Li H, Zhao Z, Chen J (1991) J Appl Phys 69(8):15Google Scholar
  21. 21.
    Leslie-Pelecky D, Rieke R (1996) Chem Mater 8:1773CrossRefGoogle Scholar
  22. 22.
    Kwong H, Wong M, Wong Y, Wong K (2006) Appl Phy Lett 89:173109CrossRefGoogle Scholar
  23. 23.
    Zhu J, Park C (2006) Mater Today 9:36CrossRefGoogle Scholar
  24. 24.
    Parkin SSP, Kaiser C, Panchula A, Rice P, Hughes B, Samant M, Yang S-H (2004) Nat Mater 3:862CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • A. Kulkarni
    • 1
  • V. S. K. Chakravadhanula
    • 2
  • V. Duppel
    • 4
  • D. Meyners
    • 3
  • V. Zaporojtchenko
    • 1
  • T. Strunskus
    • 1
  • L. Kienle
    • 2
  • E. Quandt
    • 3
  • F. Faupel
    • 1
    Email author
  1. 1.Institute for Materials Science—Multicomponent Materials, Faculty of EngineeringUniversity of KielKielGermany
  2. 2.Institute for Materials Science—Synthesis and Real Structures, Faculty of EngineeringUniversity of KielKielGermany
  3. 3.Institute for Materials Science—Inorganic Functional Materials, Faculty of EngineeringUniversity of KielKielGermany
  4. 4.Max Planck Institute for Solid State ResearchStuttgartGermany

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