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Pis'ma v Zh. Èksper. Teoret. Fiz., 2011, Volume 94, Issue 4, Pages 318–324 (Mi jetpl1997)  

This article is cited in 16 scientific papers (total in 16 papers)


Effects of the interaction between R and Fe modes of the magnetic resonance in RFe$_3$(BO$_3)_4$ rare-earth iron borates

A. M. Kuz'menkoa, A. A. Mukhina, V. Yu. Ivanova, A. M. Kadomtsevab, L. N. Bezmaternykhc

a General Physics Institute named after A. M. Prokhorov, Russian Academy of Sciences
b M. V. Lomonosov Moscow State University, Faculty of Physics
c L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences

Abstract: Resonance modes that are due to magnetic excitations in the exchange-coupled subsystems of rare-earth ions (R = Nd$^{3+}$, Sm$^{3+}$, Gd$^{3+}$) and Fe$^{3+}$ ions have been detected in submillimeter transmission spectra (0.1–0.6 THz) of RFe$_3$(BO$_3)_4$ iron borate-multiferroic single crystals. The strong interaction between spin oscillations of the Fe and R subsystems has been revealed, which determines the behavior of the modes depending on the anisotropy of the exchange splitting of the ground doublet of the R ion. It has been shown that the intensities of coupled modes (contributions to the magnetic permeability) depend strongly on the difference between the $g$ factors of Fe and R ions. This dependence makes it possible to determine the sign of the latter $g$ factor. In particular, a noticeable intensity of exchange Nd modes in NdFe$_3$(BO$_3)_4$ is due to an increase in their contribution at $g^Nd_{\perp,\parallel}<0$, while in GdFe$_3$(BO$_3)_4$ with $g_Gd\approx g_Fe\approx2$, the Fe and Gd contributions compensate each other and the exchange (Gd) mode is not observed. In spite of the weak interaction of Sm ions with the magnetic field, SmFe$_3$(BO$_3)_4$ exhibits resonance modes, which are attributed to the excitation of Sm ions through the Fe subsystem.

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English version:
Journal of Experimental and Theoretical Physics Letters, 2011, 94:4, 294–300

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Received: 03.06.2011

Citation: A. M. Kuz'menko, A. A. Mukhin, V. Yu. Ivanov, A. M. Kadomtseva, L. N. Bezmaternykh, “Effects of the interaction between R and Fe modes of the magnetic resonance in RFe$_3$(BO$_3)_4$ rare-earth iron borates”, Pis'ma v Zh. Èksper. Teoret. Fiz., 94:4 (2011), 318–324; JETP Letters, 94:4 (2011), 294–300

Citation in format AMSBIB
\by A.~M.~Kuz'menko, A.~A.~Mukhin, V.~Yu.~Ivanov, A.~M.~Kadomtseva, L.~N.~Bezmaternykh
\paper Effects of the interaction between R and Fe modes of the magnetic resonance in RFe$_3$(BO$_3)_4$ rare-earth iron borates
\jour Pis'ma v Zh. \`Eksper. Teoret. Fiz.
\yr 2011
\vol 94
\issue 4
\pages 318--324
\jour JETP Letters
\yr 2011
\vol 94
\issue 4
\pages 294--300

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