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Structure Analysis of Co/Re Superlattice Grown on an Al2O3 (110) Substrate

  • Wentao Xu (a1), Timothy Charlton (a2) (a3), Lance E. De Long (a1) and David Lederman (a3)

Abstract

The structure of a Re(5 nm)/(Co(2 nm)/Re(3 nm))19 sample grown via magnetron sputtering was thoroughly analyzed via x-ray reflectivity (XRR) and transmission electron microscopy (TEM). Cross-sectional TEM results indicate that the sample is epitaxial, with the in-plane c-axis of the superlattice pointing along the c-axis of the substrate. A quantitative analysis of XRR yielded an average thickness of each layer and an interface roughness ∼ 0.4 nm between the Co and Re layers. A careful analysis of the TEM data reveals that the in-plane lattice parameters for Co, Re and Al2O3 are approximately 0.24 nm, 0.43 nm; 0.26 nm, 0.44 nm; and 0.24 nm, 0.44 nm, respectively. The lattice spacings of Al2O3 correspond to a/2 and c/3, where a, and c are lattice parameters, respectively. Interestingly, both high resolution and Z-contrast images show a very uniform period thickness. Z-contrast images, however, show that the initial interface roughness between the Re buffer layer and the first Co layer is amplified as the layers get farther away from the substrate. A high magnification TEM analysis shows that the bottom Co-Re interface roughness is about 0.2 nm, whereas the top Re-Co interface roughness is about 0.7 nm. Previous anistropic magnetoresistance measurements are discussed in light of these new structural data.

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1. Fullerton, E. E., Kelly, D. M., Guimpel, J., and Schuller, I. K., Phys. Rev. Lett. 68, 859 (1992).
2. Parkin, S. S. P., Phys. Rev. Lett. 71, 1641 (1993).
3. Pierce, D. T., Unguris, J., Celotta, R. J., and Stiles, M. D., J. Magn. Magn. Mater. 200, 290 (1999).
4. Dieny, B., J. Magn. Magn. Mater. 136, 335 (1994).
5. Charlton, T., Lederman, D., Yusuf, S. M., and Felcher, G. P., J. Appl. Phys. 85, 4436 (1999).
6. Charlton, T., McChesney, J., Lederman, D., Zhang, F., Hilt, J. Z., and Pechan, M. J., Phys. Rev. B 59, 11897 (1999).
7. Charlton, T. and Lederman, D., Phys. Rev. B 63, 94404 (2001).
8. Burgei, W., Pechan, M. J., Charlton, T. and Lederman, D., J. Appl. Phys. 91, 7529 (2002).
9. Grundy, P. J., J. Alloys and Compounds 326, 226 (2001).
10. Lauter, H., Lauter-Pasyuk, V., Toperverg, B., Romashev, L., Milyaev, M., Krinitsina, T., Kravtsov, E., Ustinov, V., Petrenko, A., and Aksenov, V., J. Magn. Magn. Mater. 258259, 338 (2003).

Structure Analysis of Co/Re Superlattice Grown on an Al2O3 (110) Substrate

  • Wentao Xu (a1), Timothy Charlton (a2) (a3), Lance E. De Long (a1) and David Lederman (a3)

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