论文标题
四倍的perovskite namn $ _7 $ o $ _ {12} $中的非常规磁铁电力
Unconventional magnetic ferroelectricity in the quadruple perovskite NaMn$_7$O$_{12}$
论文作者
论文摘要
通过磁性，特异性的热和高电测量结果，我们报告了四倍的钙钛矿\ namno中的磁铁电性，其特征在于倾斜的抗铁磁（AFM）CE结构。出乎意料的是，铁电性与磁性磁滞回路的急剧扩展伴随，远低于AFM排序温度。这种非常规的行为表明，铁电域的形成是由局部规模的对称交换相互作用引起的，例如在磁域边界或缺陷处。与其他磁性多表情相比，以多晶样品测量的电动极化的值，$ p =0.027μ$ $ c cm $^{ - 2} $相对较大，这表明上述情况确实有望成为实践多材料的合理设计。
By means of magnetic, specific heat and pyroelectric measurements, we report on magnetic ferroelectricity in the quadruple perovskite \namno, characterized by a canted antiferromagnetic (AFM) CE structure. Surprisingly, ferroelectricity is concomitant to a dramatic broadening of the magnetic hysteresis loop, well below the AFM ordering temperature. This unconventional behavior shows that the formation of ferroelectric domains is induced by the symmetric exchange interaction in the local scale, e.g. at magnetic domain boundaries or defects. The value of electric polarization, $P = 0.027 μ$C cm$^{-2}$, measured in polycrystalline samples is comparatively large as compared to other magnetic multiferroics, suggesting that the above scenario is promising indeed for the rational design of practical multiferroic materials.
