Low Temperature Physics: 36, 511 (2010); https://doi.org/10.1063/1.3457390 (11 pages)
Fizika Nizkikh Temperatur: Volume 36, Number 6 (June 2010), p. 640-653    ( to contents , go back )

Magnetoelectric and magnetoelastic properties of rare earth iron borates

A.M. Кadomtseva, Yu.F. Popov, G.P. Vorob'ev, A.P. Pyatakov, S.S. Кrotov, К.I. Кamilov

Lomonosov Moscow State University, Vorob`evy gory, Moscow 119991, Russia
E-mail: kadomts@plms.ru

V.Yu. Ivanov, A.A. Mukhin, A.K. Zvezdin

A.M. Prokhorov General Physics Institute of RAS, 38 Vavilov Str., Moscow 119991, Russia

L.N. Bezmaternykh, I.A. Gudim, and V.L. Temerov

L.V. Kirensky Institute of Physics, Siberian Branch of Russian Academy of Sciences Krasnoyarsk 660036, Russia

Received November 5, 2009, revised December 12, 2009

Abstract

Complex studies of magnetic, ferroelectric, magnetoelectric and magnetoelastic properties of rare-earth iron borates RFe3(BO3)4 (R = Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er) and YFe3(BO3)4 were carried out. It is shown that not only magnetic properties but also magnetoelectric ones strongly depend on the type of rareearth ion, in particular on its anisotropy. This effect makes itself evident in strong temperature dependence of polarization below the Neel point and its peculiar magnetic field dependence, that is determined by the competition between f–d-exchange and external fields. It is found that the magnetoelectric and magnetoelastic anomalies are in close correlation at magnetic fieldinduced phase transitions. A spontaneous electric polarization is revealed in the rare earth iron borates below the Neel temperature TN. The ferroelectric ordering has an improper character and stipulates a strong magnetoelectric coupling below TN. In addition to the antiferromagnetic phase transition, the structural phase transition is also studied in the framework of Landau- Ginzburg approach, and the observed anomalies of dielectric and magnetoelectric properties are analyzed.

PACS: 75.80.+q Magnetomechanical effects, magnetostriction.

Key words: magnetoelectric effects, magnetoelastic effects, magnetostriction, multiferroics, iron borates, spontaneous electric polarization, structural phase transition.

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