Tuning of Magnetic and Optical Properties of Co0.8Zn0.2Fe2O4 Spinel Ferrite Thin Films Based on Post Annealing Temperature
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Abstract
This paper is dedicated to deposit zinc substituted cobalt ferrite (Co0.8Zn0.2Fe2O4) thin films on glass substrate using electron beam deposition technique. The effect of post annealing temperature on structural, magnetic, and optical properties of thin films has been investigated. Thin films have been characterized using x-ray diffraction (XRD), Raman spectroscopy, atomic force microscopy (AFM), vibrating sample magnetometer (VSM), UV-VIS spectroscopy, and spectroscopic ellipsometry (SE) analysis. The as-deposited thin films are amorphous in nature. After deposition, these thin films post annealed at different temperature ranges from 200 to 500 ∘C to enhance the crystallinity of films. The film post annealed at 200 ∘C is also amorphous in nature. As the post annealing temperature increases, the thin films become more crystalline. X-ray diffractometer and Raman analysis confirm the formation of cubical inverse spinel structure of thin films. The saturation magnetization of the thin films decreases with the annealing temperature due to the sites occupancy of cations between tetrahedral and octahedral. The reduction in coercivity is correlated with the anisotropy constant, but the anisotropy value is still high which is suitable to form stable magnetic storage memories. The band gap energy are decreased which is mainly attributed due to increase in grain size of the film. It is noted that the band gap energy of these thin films are higher than that of bulk material, so these may be suggested for use in wide band gap applications.
Keywords
Thin films E-beam deposition Magnetic properties Band gap energyReferences
- 1.Bragg, W. H.: Nature 95, 561 (1915)ADSCrossRefGoogle Scholar
- 2.Spaldin, N.A.: Magnetic materials: fundamentals and device applications, p. 119. Cambridge University Press, United Kingdom, (2003)Google Scholar
- 3.Jiles, D.C.: Introduction to Magnetism and Magnetic Materials, Chapman and Hall, USA 2nd edn, p. 89 (1998)Google Scholar
- 4.Cullity, B.D.: Introduction to Magnetic Materials, Wiley-IEEE Press, USA 2nd edn, p. 45 (2011)Google Scholar
- 5.Spaldin, N.A.: Magnetic Materials Fundamentals and Applications, Cambridge University Press, United Kingdom 2nd edn, p. 14 (2011)Google Scholar
- 6.Goldman, A.: Modern Ferrite Technology, Springer-Verlag New York Inc., United States 2nd edn, p 51 (2006)Google Scholar
- 7.Raj, K., Moskowitz, R., Casciari, R.: Advances in ferrofluid technology. J. Magn. Magn. Mater. 149, 174–180 (1995)ADSCrossRefGoogle Scholar
- 8.Shahbaz Tehrani, F.: Structural, magnetic and optical properties of zinc and copper substituted nickel ferrite nanocrystals. Mater. Sci. 1–16 (2012)Google Scholar
- 9.Mathew, D.S.: An overview of structure and magnetism of spinel ferrite nanoparticles and their synthesis in microemulsions. J. Chem. Eng. 129(3), 51–65 (2002)Google Scholar
- 10.Neelakanta, P.S.: Handbook of Electromagnetic Materials, CRC Press, Boca Raton, p 335 (1995)Google Scholar
- 11.Mathew, D.S.: An overview of structure and magnetism of spinel ferrite nanoparticles and their synthesis in microemulsion. J. Chem. Eng. 129, 51–65 (2007)CrossRefGoogle Scholar
- 12.Valenzuela, R.: Magneticceramics, pp 191–212. Cambridge University Press, Cambridge (1984)Google Scholar
- 13.Koseoglu, Y.: Effect of chromium addition on the structural, morphological and magnetic properties of nanocrystalline CoFe2O4 system. Ceram. Int. 38, 6671–6676 (2012)CrossRefGoogle Scholar
- 14.Ding, J.: Magnetic properties of mechanically alloyed CoFe2O4. Solid State Commun. 95, 31–33 (1995)ADSCrossRefGoogle Scholar
- 15.Singhal, S.: Cation distribution and magnetic properties in Cr-substituted nickel ferrites prepared using aerosol route. J. Solid State Chem. 180, 296–300 (2007)ADSCrossRefGoogle Scholar
- 16.Sankpal, A.M.: Magnetization studies on aluminium and chromium substituted Ni-Zn ferrites. J. Magn. Magn. Mater. 186, 349 (1998)ADSCrossRefGoogle Scholar
- 17.Martin, P.M.: Handbook of Deposition Technologies for Films and Coatings, William Andrew Publishing, Boston 3rd edn (2009)Google Scholar
- 18.Pierson, H.O.: Handbook of Chemical Vapour Deposition, WILLIAM ANDREW PUBLISHING, LLC. Norwich, New York, U.S.A 2nd edn (1999)Google Scholar
- 19.Mattox, D.M.: Handbook of Physical Vapour Deposition Processing, William Andrew, United States of America 2nd edn (2010)Google Scholar
- 20.Barlow, F.: Film Deposition Techniques and Processes (2000)Google Scholar
- 21.Patil, V.: Effect of annealing on structural. Morphological, electrical and optical studies of nickel oxide thin films. J. Surf. Eng. Mater. Adv. Technol. 25, 35–41 (2011)Google Scholar
- 22.Singhal, S., Namgyal, T.: Effect of Zn-substitution on the magnetic properties of cobalt ferrite nano particles prepared via sol-gel route. J. Electromagn. Anal. Appl. 2, 376–381 (2010)Google Scholar
- 23.Arulmurugan, R., Jeyadevan, B.: Effects of zinc substitution on Co-Zn and Mn-Zn ferrite nanoparticles prepared by co-precipitation. J. Magn. Magn. Mater. 288, 470–477 (2005)Google Scholar
- 24.Sathishkumar, G.: Synthesis, structural and dielectric studies of nickel substituted cobalt zinc ferrite. Mater. Sci. Appl. 1, 19–24 (2010)Google Scholar
- 25.Dey, S., Ghose, J.: Synthesis, characterization and magnetic studies on nanocrystalline Co0.2Zn0.8Fe2O4. Mater. Res. Bull. 38, 1653–1660 (2003)CrossRefGoogle Scholar
- 26.Kittel, C.: Introduction to Solid State Physics, Wiley India Pvt Ltd 7th edn (2007)Google Scholar
- 27.Cullity, B.D.: Elements of X-ray Diffraction. Addison-Wesley, Reading (1956)MATHGoogle Scholar
- 28.Dixit, G.: Structural, magnetic and optical studies of NiFe2O4 thin films. Adv. Mater. Lett. 3(1), 21–28 (2012)CrossRefGoogle Scholar
- 29.Ravindra, A.V., Padhan, P.: Electronic Structure and Optical Band Gap of CoFe2O4 Thin Films. Indian Institute of Technology, India (2012)Google Scholar
- 30.Koseoglu, Y.: Effect of Cr addition on the structural, morphological and magnetic properties of nano-crystalline cobalt ferrite system. Ceram. Int. 38, 6671–6676 (2012)CrossRefGoogle Scholar
- 31.Mahesh Kumar, A., Appa Rao, P., Chaitanya Varma, M., Choudary, G.S.V.R.K., Rao, K.H.: Cation distribution in Co0.7Me0.3Fe2O4 (Me = Zn, Ni and Mn). J. Mod. Phys. 2, 1083–1087 (2011)CrossRefGoogle Scholar
- 32.Ahmed, Y.M.Z., Hessien, M.M., Rashad, M.M., Ibrahim, I.A.: Nano crystalline copper ferrites from secondary iron oxide (Mill scale). J. Magn. Magn. Mater. 321(16), 181–187 (2009)ADSCrossRefGoogle Scholar
- 33.Stoner Wohlfarth, E.C.: Philos. Trans. R. Soc. A 240, 599 (1948). Reprinted by IEEE Trans. Magn. 27, 3475 (1991)ADSCrossRefGoogle Scholar
- 34.George, M., Nair, S.S., John, A.M., Joy, P.A., Anantharamam, M.R.: Structural, magnetic and electrical properties of the sol-gel prepared Li0.5Fe2.5O4 fine particles. J. Phys. D: Appl. Phys. 39, 900–910 (2006)ADSCrossRefGoogle Scholar
- 35.Faruk, Y.O., Haluk, S., Mehmet, S., Basol, B.M.: Phys. Scr. 71, 221–224 (2005)ADSCrossRefGoogle Scholar
- 36.Khoshman, J.M., Ingram, D.C., Kordesch, M.E.: J. Non-Cryst. Solids 354(19), 2783–2786 (2008)ADSCrossRefGoogle Scholar
- 37.Benno, G., Joachi, K.: Optical properties of thin semiconductor films October, 2003Google Scholar
- 38.Rancour, J.: Optical Thin Films User’s Handbook. McGraw-Hill, New York (1987)Google Scholar
- 39.Abdelmoneim, H.M.: Optical properties of Ti0:5Li0.5La0.1Fe1.9O4 ferrite thin films. Phys. B J. 405, 1551–1557 (2010)ADSCrossRefGoogle Scholar
- 40.Faruk, Y.O., Haluk, S., Mehmet, S., Basol, B.M.: Phys. Scr. 71, 221–224 (2005)ADSCrossRefGoogle Scholar