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Amiruddin, E. (2016). Transmission Electron Microscopy Study of Magnetic Domain of Cobalt-Samarium Thin Films Fabricated Using DC Magnetron Sputtering Technique. KnE Engineering, 1(1). https://doi.org/10.18502/keg.v1i1.503

https://doi.org/10.18502/keg.v1i1.503

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  • Erwin Amiruddin
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Published Date

  • Sep 5, 2016

Transmission Electron Microscopy Study of Magnetic Domain of Cobalt-Samarium Thin Films Fabricated Using DC Magnetron Sputtering Technique

KnE Engineering / Conference on Science and Engineering for Instrumentation, Environment and Renewable Energy /

Abstract

Alloys of cobalt samarium (Co-Sm) in the form of thin films were fabricated using dc magnetron sputtering technique. The films were fabricated as a function of samarium concentration ranging from 0 to 28 at.% in order to investigate the relationship between microstructure, coercivity and magnetic domain structure. Magnetic domain structures in the films have been studied by Lorentz microscopy using transmission electron microscopy (TEM). In this technique, the TEM was operated in the defocused mode. The results show that the magnetic image of Co90Sm10 film has fairly coarse structure with magnetization ripple and the domains ranging over 200-300 nm. The domain size is much larger than the grain size of Co90Sm10 film. The “multiparticle” or interaction domains suggested that there is strong exchange coupling between the magnetization of the neighbouring grains inside each of them. The hysteresis loop for this film shows a small coercivity with high magnetization value and high loop squareness, indicating a greater proportion of magnetic material. 

References
[1] M. F. Doerner, K. Tang, T. Arnoldussen, H. Zeng, M. F. Toneyand, and D. Weller, Microstructural and thermal stability of advanced longitudinal media, IEEE Trans Magn, 36, 43–47, (2000).


[2] S. H. Charap, P. Lu, and Y. He, Thermal stability of recorded information at high densities, IEEE Trans. Magn., 33, p. 978, (1997).


[3] H. C. Theuerer, E. A. Nesbitt, and D. D. Bacon, High Coercive Force Rare Earth Alloy Films by Getter Sputtering J, Appl Phys (Berl), 10, p. 2994, (1969).


[4] E. MT. Velu and D. N. Lambeth, High density recording on SmCo/Cr thin film media, IEEE Trans Magn, 28, 3249–3254, (1992).


[5] E. M. T. Velu, D. N. Lambeth, J. T. Thornton, and P. E. Russel, AFM structure and media noiseofCoSm/Cr thin films and hard diskJ, Appl Phys (Berl), 75, p. 6132, (1994).


[6] V. Geiss, E. Kneller, and A. Nest, Magnetic behavior of amorphous Sm-Co Alloy films,J, Appl Phys, A Mater Sci Process, 27, 79–88, (1982).


[7] M. Benaissa, K. M. Krishnan, E. E. Fullerton, and J. S. Jiang, Magnetic anisotropy and its microstructural origin in epitaxially grown SmCo thin films, IEEE Trans Magn, 34, 1204–1206, (1998).


[8] S. A. Majetich, K. M. Chowdary, and E. M. Kirkpatrick, Size and interaction effects in the magnetization reversal in SmCo5 nanoparticles, IEEE Trans Magn, 34, 985–987, (1998).


[9] E. W. Sigleton, Z. S. Shan, Y. S. Jeong, and D. J. Sellmyer, Magnetic switching volumes ofCoSm thin films for high density longitudinal recording, IEEE Trans Magn, 31, 2743– 2745, (1995).


[10] B. Ghebouli, S.-M. Cherif, A. Layadi, B. Helifa, and M. Boudissa, Structural and magneticproperties of evaporated Fe thin films on Si(1 1 1), Si(1 0 0) and glass substrates, J Magn. Magn. Mater., 312, 194–199, (2007).


[11] A. Hubert and R. Schafer, in Magnetic Domains, The Analysis of Magnetic Microstructures, Springer, Berlin, 1998.


[12] Y. G. Park and D. Shindo, Electron holography on remanent magnetization distribution of melt-spun Nd-Fe-B magnets, J Electron Microsc (Tokyo), 53, 43–47, (2004).


[13] S. A. Bendson and J. H. Judy, Magneticproperties of cobalt rare-earth thin filmsIEEE Trans, Magn, 9, 627–631, (1973).