论文标题
Ni掺杂的cabaco $ _ {4} $ o $ $ _ {7} $中巨型磁电效应的增强
Enhancement of giant magnetoelectric effect in Ni-doped CaBaCo$_{4}$O$_{7}$
论文作者
论文摘要
The polar magnet CaBaCo$_{4}$O$_{7}$ is known to exhibit the largest magnetic-field-driven electric polarization change ($ΔP$) associated with an antiferromagnetic (AFM)-ferrimagnetic (FIM) transition in a narrow temperature range between 62 and 69 K. In this work, we investigate the effect of Ni doping on its multiferroic properties, by means of Cabaco $ _ {3.9} $ _ {0.1} $ _ {0.1} $ o $ _ {7} $最高50吨的单晶上的磁化，电化，介电常数和磁性测量。在沿任何晶体学轴上应用磁场后，观察到巨大的正$ΔP$最高$ 11 \ sim 12 $ mc/m $^{2} $，以及在78 K以下的整个温度范围内的AFM-FIM过渡。 （i）增加$ΔP$的幅度和（ii）扩大了出现巨大$ΔP$的温度范围。
The polar magnet CaBaCo$_{4}$O$_{7}$ is known to exhibit the largest magnetic-field-driven electric polarization change ($ΔP$) associated with an antiferromagnetic (AFM)-ferrimagnetic (FIM) transition in a narrow temperature range between 62 and 69 K. In this work, we investigate the effect of Ni doping on its multiferroic properties, by means of magnetization, electric polarization, dielectric constant, and magnetostriction measurements on single crystals of CaBaCo$_{3.9}$Ni$_{0.1}$O$_{7}$ up to 50 T. In the doped material, two kinds of AFM phases appear below 78 K, accompanying negative $ΔP$. Upon the application of a magnetic field along any crystallographic axis, giant positive $ΔP$ of up to $11 \sim 12$ mC/m$^{2}$ is observed along with an AFM-FIM transition in the whole temperature range below 78 K. The giant magnetoelectric effect inherent in CaBaCo$_{4}$O$_{7}$ can be further enhanced just by a small amount of chemical substitution, in terms of (i) increasing the magnitude of $ΔP$ and (ii) expanding the temperature range in which giant $ΔP$ appears.
