Magnetic exchange interactions of rare-earth-substitutedDyCrO3bulk powders

Abstract

Effects of the substitution of rare-earths R = Y, Er, and Ho on the magnetic properties of Dy 0.7 R 0.3 CrO 3 are reported here in order to probe the nature of magnetism and related exchange interactions in these materials. By fitting the temperature dependence of the magnetic susceptibility to a modified Curie-Weiss law, which includes a correction for the Dzyaloshinskii-Moriya (DM) interaction, the strengths of the symmetric and antisymmetric Cr 3+-Cr 3+ exchange interactions were determined. It was found that the rare-earth substitutions had a slight effect on the strength of the symmetric Cr 3+-Cr 3+ interaction (reflected in the slight changes in the Néel temperatures) while the antisymmetric Cr 3+-Cr 3+ interaction remained unchanged. Isothermal magnetic measurements of the samples at successive temperatures revealed a plateau in the temperature dependent magnetic coercivity data, which was explained by the magnetic properties of the substituted ions. It was found that the Y substitution lead to the reduction of the strength of the magnetization and a larger peak value of magnetic coercivity as compared to that in pure DyCrO 3. The observed increase in coercivity with Er and Ho substitution can be attributed to an increased R 3+-Cr 3+ interaction strength dominated by the DM mechanism.

Magnetic structure, magnetoelastic coupling, and thermal properties ofEuCrO3nanopowders

“…In fact, the rare earth orthochromites have been demonstrated to exhibit ferroelectric polarization either induced by an external magnetic field (ME) or a spontaneous polarization as a consequence of internal magnetic fields induced by long-range magnetic ordering (MF). [3][4][5][6][7][8] The potential of the RCrO 3 was especially seen in their high magnetic ordering temperatures compared to what was observed in the orthomanganites series, RMnO 3 , (e.g. T N ∼ 27 K in TbMnO 3 ) which brought about some of the most prominent MF systems.…”

Enhancement of magnetic ordering temperature and magnetodielectric coupling by hole doping in a multiferroic DyFe0.5Cr0.5O3

“…1(d)). It is possible that there is a change in the relative alignment of transition-metal and rare-earth sublattice moments with T, which can also result in ferromagnetic and antiferromagnetic components [14,15].…”

Effect of rare-earth (Er and Gd) substitution on the magnetic and multiferroic properties of DyFe0.5Cr0.5O3

“…In this context, various transition metal oxides like orthomanganites [3], orthoferrites [4], nickelates and cobaltites [5], doped defossities [6], vanadites [7] etc which show multiferroic properties have been investigated. Though rare-earth orthochromites (LnCrO 3 , Ln = rare-earths) have been studied for several decades for their interesting physical properties [8][9][10][11][12][13], the interest to search for multiferroic behaviour and magnetoelectric (ME) coupling occurred during last few years only. Such investigations revealed multiferroic behaviour in these materials [14][15].…”