S. V. Demishev, A. L. Chernobrovkin, V. V. Glushkov, A. V. Grigor'eva, E. A. Gudilin, N. E. Sluchanko, N. A. Samarin, A. V. Semeno, “FM-AFM crossover in vanadium oxide nanomaterials”, Pis'ma v Zh. Èksper. Teoret. Fiz., 2010, Volume 91, Issue 1,Pages <nobr>12

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CONDENSED MATTER

FM-AFM crossover in vanadium oxide nanomaterials

S. V. Demishev^a, A. L. Chernobrovkin^a, V. V. Glushkov^a, A. V. Grigor'eva^b, E. A. Gudilin^b, N. E. Sluchanko^a, N. A. Samarin^a, A. V. Semeno^a

^a General Physics Institute named after A. M. Prokhorov, Russian Academy of Sciences
^b Faculty of Materials Science, MSU

Abstract: The magnetic properties of nanomaterials based on vanadium oxide (multiwall nanotubes, nanorods, and nanolayers) have been investigated in the temperature range of 1.8–220 K by high-frequency (60-GHz) EPR. A transition from a ferromagnetic temperature dependence to an antiferromagnetic temperature dependence has been observed in nanorods and nanotubes with a decrease in the temperature. The FM-AFM crossover observed near T _C ~ 110 K is accompanied by a low-temperature increase in the Curie constant by a factor of 2.7–7. The comparison of the experimental data for various VO_x nanoparticles indicates that the most probable cause of the change in the type of magnetic interaction is a change in the concentration of V⁴⁺ magnetic ions.

Received: 05.11.2009