Suzdalev, I. and Maksimov, Yu. and Imshennik, V. and Novichikhin, S. and Matveev, V. and Gudilin, E. and Petrova, O. and Tret`yakov, Yu. and Chuev, M. (2009) Magnetic phase transitions in nanostructures with different cluster orderings. Nanotechnologies in Russia, 4 . pp. 467-474.
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Official URL: http://dx.doi.org/10.1134/S1995078009070076
Nanostructures have been synthesized by (i) the micellar template method with the subsequent organization of Fe2O3 nanoclusters about 10 nm in size to a cluster crystal and (ii) by the aerosol method with the fixation of Fe2O3 nanoclusters about 10 nm in size in the NaCl matrix. The magnetic properties of the synthesized nanostructures have been studied. The Mössbauer spectroscopic examination of the cluster crystal revealed a magnetic phase transition of the first order, with the transition temperature being near the room temperature. This nanostructure is characterized by a steep magnetization curve, which is typical of an ordered structure with a weak intercluster interaction like a molecular crystal and a low energy of the magnetic anisotropy K = 3.5 × 104 J/m3. The disordered Fe2O3 nanostructure in the NaCl matrix is characterized by superparamagnetic behavior and smooth magnetization curves without saturation at 1 T and the magnetic anisotropy energy K = 2.5 × 104 J/m3, which is close to the corresponding value in bulk α- and γ-Fe2O3.
|Deposited By:||Prof. Alexey Ivanov|
|Deposited On:||11 Nov 2009 07:54|
|Last Modified:||11 Nov 2009 08:00|
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