Abstract
The results of experiments on electrical conductivity and magnetic properties of thin cobalt-doped zinc oxide films are reported. The results indicate the predominance of the hoping conduction mechanism at low temperatures and the band mechanism at high temperatures. An increase in the cobalt concentration from 1.5 to 6.3 at % leads to the reduction of the electrical conductivity of the films. The contribution of hopping conduction to the conductivity increases due to a decrease in the crystallinity of the films and localization of a part of electron states upon an increase in the cobalt concentration. For cobalt-containing films, a hysteresis of the magnetic moment as a function of the magnetic field is observed. The dependence of the shape of the magnetization curves on the cobalt concentration is irregular. The paramagnetic contribution to the magnetic susceptibility increases with the cobalt concentration.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Ü. Özgür, Ya. I. Alivov, C. Liu, A. Teke, M. A. Reshchikov, S. Doǧan, V. Avrutin, S.-J. Cho, and H. Morkoç, J. Appl. Phys. 98, 041 301 (2005).
K. Ueda, H. Tabata, and T. Kawai, Appl. Phys. Lett. 79, 988 (2001).
Ü. Özgür, Ya. I. Alivov, C. Liu, A. Teke, M. A. Reshchikov, S. Doǧan, V. Avrutin, S.-J. Cho, and H. Morkoç, J. Appl. Phys. 98, 041301 (2005).
T. Jungwirth, J. Sinova, J. Mašek, J. Kučera, and A. H. MacDonald, Rev. Mod. Phys. 78, 809 (2006).
I. Žutić, O. Fabian, and S. Das Sarma, Rev. Mod. Phys. 76, 323 (2004).
Q. Liu, C. L. Gan, C. L. Yuan, and G. C. Han, Appl. Phys. Lett. 92, 032 501 (2008).
J. M. D. Coey, M. Venkatesan, and C. B. Fitzgerald, Nat. Mater. 4, 173 (2005).
N. H. Hong, J. Sakai, and V. Brizel, J. Phys.: Condens. Matter 19, 036 219 (2007).
S. D. Yoon, Y. Chen, A. Yang, T. L. Goodrich, X. Zuo, D. A. Arena, K. Ziemer, C. Vittoria, and V. G. Harris, J. Phys.: Condens. Matter 18, L355 (2006).
N. H. Hong, N. Poirot, and J. Sakai, Appl. Phys. Lett. 89, 042 503 (2006).
D. Kim, J.-H. Yang, and J. Hong, J. Appl. Phys. 106, 013 908 (2009).
Q. Wang, Q. Sun, G. Chen, Y. Kawazoe, and P. Jena, Phys. Rev. B: Condens. Matter 77, 205 411 (2008).
S. C. Wi, J.-S. Kang, J. H. Kim, S.-B. Cho, B. J. Kim, S. Yoon, B. J. Suh, S. W. Han, K. H. Kim, K. J. Kim, B. S. Kim, H. J. Song, H. J. Shin, J. H. Shim, and B. I. Min, J. Appl. Phys. 84, 4233 (2004).
L. El Mir, Z. Ben Ayadi, H. Rahmouni, J. El Ghoul, K. Djessas, and H. J. von Bardeleben, Thin Solid Films 517, 6007 (2009).
L. El Mir, Z. Ben Ayadi, H. Rahmouni, J. El Ghoul, K. Djessas, and H. J. von Bardeleben, Thin Solid Films 517, 6007 (2009).
B. I. Shklovskii and A. L. Efros, Electronic Properties of Doped Semiconductors (Nauka, Moscow, 1979; Springer, Berlin, 1984).
B. B. Straumal, A. A. Mazilkin, S. G. Protasova, A. A. Myatiev, P. B. Straumal, and B. Baretzky, Acta Mater. 56, 6246 (2008).
B. B. Straumal, F. F. Mazilkin, S. G. Protasova, A. A. Myatiev, P. B. Straumal, G. Schütz, P. A. van Aken, E. Goering, and B. Baretzky, Phys. Rev. B: Condens. Matter 79, 205 206 (2009).
S. Banerjee, M. Mandal, N. Gayathri, and M. Sardar, Appl. Phys. Lett. 91, 182 501 (2007).
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © V.G. Kytin, V.A. Kul’bachinskii, D.S. Glebov, L.I. Burova, A.R. Kaul, O.V. Reukova, 2010, published in Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2010, Vol. 138, No. 2, pp. 255–260.
Rights and permissions
About this article
Cite this article
Kytin, V.G., Kul’bachinskii, V.A., Glebov, D.S. et al. Electrical conductivity of Zn1−x Co x O ferromagnetic films at low temperatures. J. Exp. Theor. Phys. 111, 225–230 (2010). https://doi.org/10.1134/S106377611008011X
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S106377611008011X