Skip to main content
×
×
Home

Structural and Magnetic Properties of Co50 ± x Pt50 ± x Thin Films Prepared by Mbe Co-Evaporation on (001) MgO Substrate at Various Temperatures

  • V. Parasote (a1), M.-C. Cadevwlle (a1), V. Pierron-Bohnes (a1) and W. Grange (a1)
Abstract

Structural and magnetic properties of Co50 ± x Pt50± x films 25-50 nm thick, prepared by molecular beam epitaxy onto a Pt buffer grown on MgO (001) substrate have been investigated. A series of 3 samples with different compositions (x = 6, 0, -6) was grown at 800 K on a 10 nm thick Pt buffer and another series of 5 samples of equiatomic composition was prepared at various growth temperatures (390 K≤ TG≤ 780 K) on a Pt buffer 4 nm thick. X-ray diffraction and TEM studies show the presence of grains with [111] and [002] orientations, the [002] grains being a mixture of the tetragonal L10 ordered phase and of the fcc disordered one. Both the thickness of the buffer layer and the deposition temperature are determinant parameters of the structural quality of the films and of the degree of long range order (LRO). An apparent LRO parameter (ηapp) is deduced from the superstructure and main peak intensity ratio. Its increase with the growth temperature is described through a thermally activated model that yields a small activation energy of 0.28 eV, illustrating the role played by both surface diffusion and surface interactions in building the L10 compound in agreement with theoretical predictions. An average uniaxial magnetocrystalline anisotropy energy (Kuav) is deduced from the magnetization curves measured by a SQUID. The anisotropy energy of the [002] grains (Ku002) is deduced, assuming a linear relationship between the anisotropies and the phase percentages. One observes a continuous but not linear increase of Ku002 with ηapp.

Copyright
References
Hide All
1. Eurin, P. and Paulevé, J., IEEE Trans. on Magnetics Mag. 5, 216 (1969).
2. Lairson, B. M. et al. , J. Appl. Phys. 74 (3) 1922 (1993).
3. Visokay, M. R. and Sinclair, R., Appl. Phys. Lett. 66 (13) 1692 (1995).
4. Harp, G. R. et al. , Mat. Res. Soc. Symp. Proc. 313, 493 (1993).
5. Cadeville, M.C. et al. , Physica Scripta, T49 364372 (1993).
6. Leroux, C. et al. J. Phys. F: Met. Phys. 18, 2033 (1988).
7. Dahmani, C. E., PhD Thesis Université Louis Pasteur, Strasbourg, France (1985).
8. Cadeville, M. C., Dahmani, C.E. and Kern, F., JMMM 54–57, 1055 (1986).
9. Parasote, V., PhD thesis, Louis Pasteur University, Strasbourg, France (1998).
10. Berg, H. and Cohen, J. B., Metal. Trans., 3, 1797 (1972).
11. Bouzidi, L. et al. , Thin Solid Films, in press (1998) and Pierron-Bohnes, V. et al. , to be published in “Diffusion Mechanisms in Crystalline Materials” Mat. Res. Soc. Symp. Proc. (1998).
12. Stoeffler, D. and Gautier, F., Surface Science, 249, 265 (1991).
13. Gehanno, V., Marty, A., Gilles, B. and Samson, Y., Phys. Rev. B, 55, 12552 (1997).
14. Dahmani, C.E., Cadeville, M.C. and Pierron-Bohnes, V., Acta Metall., 3, 369 (1985).
15. Treglia, G., private communication.
16. Samuka, A., J. Phys. Soc. Jap., 63 3053 (1994).
17. Meneghini, C. et al. , J. Phys. IV France 7 (suppl.), C21115 (1997).
Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

MRS Online Proceedings Library (OPL)
  • ISSN: -
  • EISSN: 1946-4274
  • URL: /core/journals/mrs-online-proceedings-library-archive
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed