Effect of rare-earth (Er and Gd) substitution on the magnetic and multiferroic properties of DyFe_0.5Cr_0.5O₃

Abstract

We report the results of our investigations on the influence of partial substitution of Er and Gd for Dy on the magnetic and magnetoelectric properties of DyFe 0.5 Cr 0.5 O 3 , which is known to be a multiferroic system. Magnetic susceptibility and heat capacity data, apart from confirming the occurrence of magnetic transitions at ~ 121 and 13 K in DyFe 0.5 Cr 0.5 O 3 , bring out that the lower transition temperature only is suppressed by rare-earth substitution.Multiferroic behavior is found to persist in Dy 0.4 Ln 0.6 Fe 0.5 Cr 0.5 O 3 (Ln= Er and Gd). There is an evidence for magnetoelectric coupling in all these materials with qualitative differences in its behavior as the temperature is changed across these two transitions. Remnant electric polarization is observed for all the compounds. The most notable observation is that electric polarization is seen to get enhanced as a result of rare-earth substitution with respect to that in DyFe 0.5 Cr 0.5 O 3 . Interestingly, similar trend is seen in magnetocaloric effect, consistent with the existence of magnetoelectric coupling. The results thus provide evidence for the tuning of magnetoelectric coupling by rare-earth substitution in this family of oxides.2

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

“…Presence of two magnetic-moment containing transition metal ions in the perovskite structure make such compounds interesting from magnetism angle and its coupled properties. In this article, we focus on DyFe 0.5 Cr 0.5 O 3 [9,10], which has been shown to be a multiferroic, exhibiting significant magnetocaloric effect (MCE) with magnetoelectric (ME) coupling playing a role to enhance MCE [9]. We have recently found that a partial replacement of Dy by some other rare-earth ions leads to the enhancement of both MCE and electric polarization [10].…”

“…In this article, we focus on DyFe 0.5 Cr 0.5 O 3 [9,10], which has been shown to be a multiferroic, exhibiting significant magnetocaloric effect (MCE) with magnetoelectric (ME) coupling playing a role to enhance MCE [9]. We have recently found that a partial replacement of Dy by some other rare-earth ions leads to the enhancement of both MCE and electric polarization [10]. Such chemical substitutions do not involve any electron or hole doping.…”

Magnetic properties of pure and Fe doped HoCrO3 thin films fabricated via a solution route

“…In the last decade, magnetoelectric multiferroic (ME-MF) materials have attracted considerable attention due to their promising applications in multifunctional devices, such as computer memory, magnetic field sensors, novel spintronic devices, energy harvesting, etc [1][2][3][4]. One such system, namely rare-earth chromites (RCrO 3 ) have been explored widely for their ME-MF properties [5][6][7]. In some recent reports the magnetocaloric effect (MCE), which is mainly characterized by an isothermal magnetic entropy change (ΔS) achieved by adiabatic tuning of the magnetization, have also been investigated in the RCrO 3 system.…”

Quantitative Calculation of the Clustering Behavior of Fe‐Rich and Cr‐Rich REFepCr1−pO3 Crystals

“…As a result, it can be considered that T ¼ 11.97 K is the transition temperature that the ions' moment direction from order to disorder, which may correspond to the ordering temperature of Gd-Fe/Cr ferromagnetic exchange. [21,34,35] A second maximum, T ¼ 259.96 K, corresponds to the phase transition temperature T 2 of the superexchange interaction between Fe 3þ -O-Cr 3þ .…”