Abstract
The electrical properties of (Co45Fe45Zr10)x(Al2O3)1−x granular nanocomposites have been studied. The concentration dependences of electrical resistivity are S-shaped (in accordance with the percolation theory of conduction) with a threshold at a metallic component concentration of ∼41 at. %. An analysis of the temperature behavior carried out in the range 300–973 K revealed that structural relaxation and crystallization of the amorphous phase are accompanied by a decrease in the electrical resistivity of the composites above the percolation threshold and by its increase below the percolation threshold. For metallic phase concentrations x<41 at. %, variable range hopping conduction over localized states near the Fermi level was found to be dominant at low temperatures (77–180 K). A further increase in temperature brings about a crossover of the conduction mechanism from Mott’s law ln(σ) ∝ (1/T)1/4 to ln(σ) ∝ (1/T)1/2. A model of inelastic resonance tunneling over a chain of localized states of the dielectric matrix was used to find the average number of localized states involved in the charge transport between metallic grains.
Similar content being viewed by others
References
S. Honda, J. Magn. Magn. Mater. 165, 153 (1997).
K. Yakushiji, S. Mitani, and K. Takanashi, J. Magn. Magn. Mater. 212, 75 (2000).
N. Kobayashi, S. Ohnuma, T. Masumoto, and H. Fujimori, J. Appl. Phys. 90(8), 4159 (2001).
I. V. Bykov, E. A. Gan’shina, A. B. Granovskii, and V. S. Gushchin, Fiz. Tverd. Tela (St. Petersburg) 42(3), 487 (2000) [Phys. Solid State 42, 498 (2000)].
A. V. Kimel’, R. V. Pisarev, A. A. Rzhevskii, Yu. E. Kalinin, A. V. Sitnikov, O. V. Stognei, F. Bentivegna, and Th. Rasing, Fiz. Tverd. Tela (St. Petersburg) 45(2), 269 (2003) [Phys. Solid State 45, 283 (2003)].
N. E. Kazantseva, A. T. Ponomarenko, V. G. Shevchenko, I. A. Chmutin, Yu. E. Kalinin, and A. V. Sitnikov, Fiz. Khim. Obrab. Mater., No. 1, 5 (2002).
O. V. Stognei, Yu. E. Kalinin, A. V. Sitnikov, I. V. Zolotukhin, and A. V. Slyusarev, Fiz. Met. Metalloved. 91(1), 24 (2001) [Phys. Met. Metallogr. 91, 21 (2001)].
B. A. Aronzon, A. E. Varfolomeev, A. A. Likal’ter, V. V. Ryl’kov, and M. V. Sedova, Fiz. Tverd. Tela (St. Petersburg) 41(6), 944 (1999) [Phys. Solid State 41, 857 (1999)].
Yu. E. Kalinin, A. V. Sitnikov, O. V. Stognei, I. V. Zolotukhin, and P. V. Neretin, Mater. Sci. Eng. A 304–306, 941 (2001).
H. R. Khan, A. Granovsky, F. Brouers, E. Ganshina, J. P. Clerc, and M. Kurmichev, J. Magn. Magn. Mater. 183, 127 (1998).
J. C. Denardin, A. B. Pakhomov, M. Knobel, H. Liu, and X. X. Zhang, J. Phys.: Condens. Matter 12, 3397 (2000).
B. Abeles, R. W. Cohen, and G. W. Cullen, Phys. Rev. Lett. 17, 632 (1966).
P. Sheng, B. Abeles, and Y. Arie, Phys. Rev. Lett. 31(1), 44 (1973).
E. Cuevas, M. Ortuño, and J. Ruiz, Phys. Rev. Lett. 71(12), 1871 (1993).
E. Z. Meilikhov, Zh. Éksp. Teor. Fiz. 115(4), 1484 (1999) [JETP 88, 819 (1999)].
L. I. Glazman and K. A. Matveev, Zh. Éksp. Teor. Fiz. 94(6), 332 (1988) [Sov. Phys. JETP 67, 1276 (1988)].
L. I. Glazman and R. I. Shekhter, Zh. Éksp. Teor. Fiz. 94(1), 292 (1988) [Sov. Phys. JETP 67, 1462 (1988)].
L. V. Lutsev, T. K. Zvonareva, and V. M. Lebedev, Pis’ma Zh. Tekh. Fiz. 27(15), 84 (2001) [Tech. Phys. Lett. 27, 659 (2001)].
L. V. Lutsev, Yu. E. Kalinin, A. V. Sitnikov, and O. V. Stognei, Fiz. Tverd. Tela (St. Petersburg) 44(10), 1802 (2002) [Phys. Solid State 44, 1889 (2002)].
N. F. Mott and E. A. Davis, Electronic Processes in Non-Crystalline Materials (Clarendon, Oxford, 1971; Mir, Moscow, 1974).
S. Weng, S. Moehlecke, and M. Strongin, Phys. Rev. Lett. 50(22), 1795 (1983).
M. A. S. Boff, J. Geshev, J. E. Schmidt, W. H. Flores, A. B. Antunes, M. A. Gusmao, and S. R. Teixeira, J. Appl. Phys. 91(12), 9909 (2002).
I. V. Zolotukhin, Yu. E. Kalinin, P. V. Neretin, A. V. Sitnikov, and O. V. Stognei, Al’ternativ. Énerget. Ékol., No. 2, 7 (2002).
P. Olhafen, in Glassy Metals II: Atomic Structure and Dynamics, Electronic Structure, Magnetic Properties, Ed. by H. Beck and G. Güntherodt (Springer, Heidelberg, 1984; Mir, Moscow, 1986).
W. Heywang et al., in Amorphen und Polykristallinen Halbleiter, Ed. by W. Heywang (Springer, Heidelberg, 1984; Mir, Moscow, 1987).
Yu. E. Kalinin, A. N. Remizov, A. V. Sitnikov, and N. P. Samtsova, Perspekt. Mater., No. 3, 62 (2003).
Yu. R. Zakis, Defects in Vitreous State of Material (Zinatne, Riga, 1984) [in Russian].
Author information
Authors and Affiliations
Additional information
__________
Translated from Fizika Tverdogo Tela, Vol. 46, No. 11, 2004, pp. 2076–2082.
Original Russian Text Copyright © 2004 by Kalinin, Remizov, Sitnikov.
Rights and permissions
About this article
Cite this article
Kalinin, Y.E., Remizov, A.N. & Sitnikov, A.V. Electrical properties of amorphous (Co45Fe45Zr10)x(Al2O3)1−x nanocomposites. Phys. Solid State 46, 2146–2152 (2004). https://doi.org/10.1134/1.1825563
Received:
Issue Date:
DOI: https://doi.org/10.1134/1.1825563