Antiferromagnetic resonance and dielectric properties of rare-earth ferroborates in the submillimeter frequency range

The magnetoresonance and dielectric properties of a number of crystals of a new family of multiferroics, namely, rare-earth ferroborates RFe 3 (BO 3 ) 4 (R = Y, Eu, Pr, Tb, Tb 0.25 Er 0.75 ), are studied in the sub-millimeter frequency range (ν = 3–20 cm −1 ). Ferroborates with R = Y, Tb, and Eu exh...

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Bibliographic Details
Published in:Journal of experimental and theoretical physics 2011-07, Vol.113 (1), p.113-120
Main Authors: Kuz’menko, A. M., Mukhin, A. A., Ivanov, V. Yu, Kadomtseva, A. M., Lebedev, S. P., Bezmaternykh, L. N.
Format: Article
Language:English
Subjects:
Analysis
ANISOTROPY
ANTIFERROMAGNETISM
BORATES
Classical and Quantum Gravitation
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTALS
Dielectrics
Disorder
Electrical conductivity
Elementary Particles
EXCHANGE INTERACTIONS
IRON COMPOUNDS
IRON IONS
MAGNETIC PROPERTIES
MAGNETIC RESONANCE
Order
Particle and Nuclear Physics
PERMITTIVITY
PHASE TRANSFORMATIONS
Phase Transition in Condensed System
Physics
Physics and Astronomy
Quantum Field Theory
RARE EARTH COMPOUNDS
Relativity Theory
Solid State Physics
TEMPERATURE DEPENDENCE
Toy industry
TRIGONAL LATTICES
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Summary:The magnetoresonance and dielectric properties of a number of crystals of a new family of multiferroics, namely, rare-earth ferroborates RFe 3 (BO 3 ) 4 (R = Y, Eu, Pr, Tb, Tb 0.25 Er 0.75 ), are studied in the sub-millimeter frequency range (ν = 3–20 cm −1 ). Ferroborates with R = Y, Tb, and Eu exhibit permittivity jumps at temperatures of 375, 198, and 58 K, respectively, which are caused by the R 32 → P 3 1 21 phase transition. Antiferromagnetic resonance (AFMR) modes in the subsystem of Fe 3+ ions are detected in the range of anti-ferromagnetic ordering ( T < T N = 30–40 K) in all ferroborates that have either an easy-plane (Y, Eu) or easy-axis (Pr, Tb, Tb 0.25 Er 0.75 ) magnetic structure. The AFMR frequencies are found to depend strongly on the magnetic anisotropy of a rare-earth ion and its exchange interaction with the Fe subsystem, which determine the type of magnetic structure and the sign and magnitude of an effective anisotropy constant. The basic parameters of the magnetic interactions in these ferroborates are found, and the magnetoelectric contribution to AFMR is analyzed.
ISSN:1063-7761
1090-6509
DOI:10.1134/S106377611105013X