Improving the Magnetic Properties Co2FeSi Heusler Compound by Modifying the Crystalline Order in Different Manufacturing Procedures

Authors

Research and Technology of Magnetism Lab. physics Department, Yazd University, Yazd, Iran.

Abstract

In this study, the improvement of the magnetic properties of Co2FeSi Heusler compound was followed by the utilization of different experimental synthesizing procedures. Comparing the crystal structure showed that the milled samples had a higher crystalline order than the arc-melted ones. Annealing of the milled sample improved the crystalline order, resulting in the highest saturation magnetization (5/24 μB/F.u.). The difference in the saturation magnetization of the other samples was explained by the core-shell model. Comparison of the various coercivity mechanisms showed that the decrease in the size of crystallites played a key role in the higher value of the milled samples coercivity.

Keywords


1. Miura, Y., Nagao, K., and Shirai, M., “Atomic Disorder Effects on Half-metallicity of the Full-heusler Alloys Co2(Cr1−xFex)Al: A First-principles Study”, Physical Review B, Vol. 69, p. 144413, 2004.
2. Kudryavtsev, Y. V., Uvarov, V. N., Oksenenko, V. A., Lee, Y. P., Kim, J. B., Hyun, Y. H., Kim, K. W., Rhee, J. Y., and Dubowik, J., “Effect of Disorder on Various Physical Properties of Co2CrAl Heusler Alloy Films: Experiment and Theory”, Physical Review B, Vol. 77, p. 195104, 2008.
3. Kobayashi, K., Umetsu, R. Y., Kainuma, R., Ishida, K., Oyamada, T., Fujita, A., and Fukamichi, K., “Phase Separation and Magnetic Properties of Half-metal-type Co2Cr1−xFexAl Alloys”, Applied Physics Letters, Vol. 85, p. 4684, 2004.
4. Wurmehl, S., Fecher, G. H., Kandpal, H. C., Ksenofontov, V., Felser, H., and Lin, H. J., “Investigation of Co2FeSi: The Heusler Compound with Highest Curie Temperature and Magnetic Moment”, Applied Physics Letters, Vol. 88, p. 032503-5, 2006.
5. Umetsu, R. Y., Okubo, A., and Kainuma, R., “Magnetic and Chemical Order-disorder Transformations in Co2Fe(Ga1−xSix) and Co2Fe(Al1−ySiy) Heusler Alloys”, Journal of Applied Physics, Vol. 111, p. 073909, 2012.
6. Graf, T., Felser, C., and Stuart, S., “Simple Rules for the Understanding of Heusler Compounds”, Progress in Solid State Chemistry, Vol. 39, p.1, 2011.
7. Kübler, J. J., Fecher, G. H., and Felser, C., “Understanding the Trend in the Curie Temperatures of Co2-based Heusler Iompounds: Ab Initio Calculations”, Physical Review B, Vol. 76, p. 024414, 2007.
8. Kandpal, H. C., Fecher, G. H., Felser, C., and Schönhense G., “Electron Correlations in Co2Mn1−xFexSi Heusler Compounds”, Physical Review B, Vol. 73, p. 094422, 2006.
9. Buschow, K. H. J., Van Engen, P. J., Jongebreur, R., “Magneto-Optical Properties of Metallic Ferromagnetic Materials”, Journal of Magnetism and Magnetic Materials, Vol. 38, p. 1, 1983.
10. Nakatani, T. M., Rajanikanth, A., Gercsi, Z., Takahashi, Y. K., Inomata, K., and Hono, K., “Structure, Magnetic Property, and Spin Polarization of Co2FeAlxSi1−x Heusler Alloys”, Journal of Applied Physics, Vol. 102, p. 033916, 2007.
11. Niculescu, V., Burch, T. J., Raj, K., and Budnick, J. I., “Properties of Heusler-type Materials Fe2TSi and FeCo2Si”, Journal of Magnetism and Magnetic Materials, Vol. 5, p. 60, 1977.
12. Wurmehl, S., Fecher, G. H., Kandpal, H. C., Ksenofontov, V., Felser, C., Lin, H. J., and Morais, J., “Geometric, Electronic, and Magnetic Structure of Co2FeSi: Curie Temperature and Magnetic Moment Measurements and Calculations”, Physical Review B, Vol. 72, p. 184434, 2005.
13. Hakimi, M., Kameli, P., and Salamati, H., “Structural and Magnetic Properties of Co2CrAl Heusler Alloys Prepared by Mechanical Alloying”, Journal of Magnetism and Magnetic Materials, Vol. 322, p. 3443, 2010.
14. Inomata, K., Okamura, S., Miyazaki, A., Kikuchi, M., Tezuka, N., Wojcik, M., and Jedryka, E., “Structural and Magnetic Properties and Tunnel Magnetoresistance for Co2(Cr,Fe)Al and Co2FeSi Full-heusler Alloys”, Journal of Physics D: Applied Physics, Vol. 39, p. 816, 2006.
15. Kumar, M., Nautiyal, T., and Auluck, S., “First-principles Calculations of Electronic and Optical Properties of Fe3−xVxAl (x = 0–3) Compounds”, Journal of Physics: Condensed Matter, Vol. 21, p. 196003, 2009.
16. Hakimi, M., Khajeh Aminian, M., “Effect of Extra Nonmagnetic Ga Atoms on Lattice Ordering and Magnetic Properties of Fe2CoGa and Co2FeGa Heusler Compounds”, Iranian Journal of Physics Research, Vol. 14, pp. 1-7, 2014.
17. Williamson, G. K., and Hall, W. H., “X-ray Line Broadening from Filed Aluminium and Wolfram”, Acta Metall, Vol. 1, p. 22, 1953.
18. Balke, B., Ouardi, S., Graf, T., Barth, J., Blum, C. G. F., Fecher, G. H., Shkabko, A, Weidenkaff, A., and Felser, C., “Seebeck Coefficients of Half-metallic Ferromagnets”, Solid State Communication, Vol. 150, pp. 529-532, 2010.
19. Khani, O., Zargar Shooshtari, M., Farbod, M., and Shams, M, “Synthesis and Study of the Structural and Electromagnetic Properties of Iron-carbon Core-shell Nanoparticles”, Journal of Research on Many-body Systems, Vol. 4, No. 8, pp. 13-20, 2015.
20. Toomver, T. T., and Ross, H. U., “Effect of Impurity Additions on the Remanence and Coercivity of Reduced Hematite Ores”, Journal of Canadian Metallurgical Quarterly, Vol. 9, pp. 365-371, 2013.
21. Buschow, K. H. J., and De Boer, F. R., Physics of Magnetism and Magnetic Materials, Kluwer Academic Publishers, 2003. Translated to Persian by Hakimi M., Shahidani M., Yazd Univercity Publishers.
22. Zhang, Sh., Qi, Z., Zhao, Y., Jiao, Q., Ni, X., Wang, Y., Chang, Y., and Ding, C., “Core/Shell Structured Composities of Hollow Spherical CoFe2O4 and CNTs as Absorbing Materials”, Journal of Alloys and Compounds, Vol. 694, pp. 309-312, 2017.
23. Mahdavi Matin, M., Hakim,i M., Mazloum-Ardakani, M., “Improvement of Magnetic Properties of Iron Oxide by Addition of Impurity in Co-precipitation and Hydrothermal Process and Study of Annealing Effect”, Journal of Research on Many-body Systems, submitted.

ارتقاء امنیت وب با وف ایرانی