Nano Archive

Magnetic transitions in one- and two-dimensional nanostructures

Suzdalev, Yu and Kolchenko, N. and Novichikhin, S. and Imshennik, V. and Matveev, V. and Shub, B. and Eliseev, A. and Kharlamova, M. and Lukashin, A. and Tretyakov, Yuri D. and Smirnov, V. and Zemtsova, E. and Kirichenko, S. (2010) Magnetic transitions in one- and two-dimensional nanostructures. Nanotechnologies in Russia, 5 (3). pp. 214-222.

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One-dimensional nanostructures based on single-layer carbon nanotubes (CNTs) with FeBr2 chains and two-dimensional nanostructures with Fe-O-Fe layers deposited on the surface of silica gel by molecular layering have been synthesized. An Mössbauer spectroscopy examination has shown that a magnetic structure with T C = 21 K and B in = 29.8 ± 0.5 T is formed in nanotubes with FeBr2 · 2H2O at T = 15 K. In the case of the Fe-O-Fe layers, the surface of silica gel has a nonmagnetic monolayer along with α-Fe2O3 nanoclusters with B in(1) = 48.5 ± 0.5 T and B in(2) = 46.4 ± 0.5 T at T = 15 K and the temperature T C = 210 K. The variation in magnetization with temperature is calculated using three models of phase transitions, namely, the model of critical indices, the two-dimensional Ising model (the Onsager formula), and the three-dimensional Heisenberg model. The experimental data are fitted best by the model of critical indices with the critical parameters α = 0.22 and 0.18 for 1D and 2D structures, respectively, demonstrating that these nanosystems approach two-dimensional structures (α = 0.15).

Item Type:Article
ID Code:9180
Deposited By:Prof. Alexey Ivanov
Deposited On:13 May 2010 12:54
Last Modified:13 May 2010 13:19

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