Suppression of multiferroic order in hexagonal ceramics

Abstract

We have investigated the effects of substituting In for Mn on the antiferromagnetic phase transition in YMnO 3 using magnetic, dielectric, and specific heat measurements. We prepared a set of isostructural phase pure hexagonal YMn 1-x In x O 3 samples having x=0 to x=0.9, which exhibit a systematic decrease of the antiferromagnetic ordering temperature with increasing In content. The multiferroic phase, which develops below T N , appears to be completely suppressed for x≥0.5 in the temperature range investigated, which can be attributed solely to the dilution of magnetic interactions as the crystal structure remains hexagonal. Similar to previous reports, we find an enhancement of the magnetocapacitive coupling on dilution with non-magnetic ions.

Hexagonal Manganites—(RMnO3): Class (I) Multiferroics with Strong Coupling of Magnetism and Ferroelectricity

“…The sharp slope change is consistent with earlier reports for single crystals [144][145][146]. However, the magnetic signature at may be less clear in powder samples, possibly due to sample quality or grain size problems [43,90,95,[147][148][149][150].…”

Study of magnetic behavior in hexagonal-YMn1−Fe O3 (x=0 and 0.2) nanoparticles using remanent magnetization curves

“…Recently, Yoo et al [28] have also observed the SG phase in Cr-doped h-YMnO 3 and it was found that the transition temperature increases with Cr-doping due to double exchange interaction between Cr 3 þ and Mn 3 þ ions. However, it has also been observed that replacing Mn by non-magnetic In suppresses the magnetic ordering without introducing any new phase transitions below T N [29]. A spin-glass like freezing has been observed in γ-Fe 2 O 3 [30] and CoFe 2 O 4 [10] nanoparticles ( $ 3 nm), which was attributed to the collective blocking and localized spin canting in the low temperature regime.…”

Study of the low‐temperature properties of multiferroic YbMnO3 and YbMn0.7Ga0.3O3 single crystals

“…The interest in multiferroic manganites ReMnO 3 (Re = Gd  Lu, Y) remains rather high 1–7. The search of new materials is directed toward finding compounds with higher magnetic ordering temperature and stronger magnetoelectric coupling.…”