Reversal and non-reversal ferroelectric polarizations in a Y-type hexaferrite
Reversal and non-reversal ferroelectric polarizations in a Y-type hexaferrite
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Y 型六角形铁氧体中的反转和非反转铁电极化
DOI：
10.1039/c8tc05247f
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发表时间：
2019
影响因子：
6.4
通讯作者：
Mingliang Tian
中科院分区：
文献类型：
--
作者：
Yongqiang Wang;Shile Zhang;W. K. Zhu;Langsheng Ling;Lei Zhang;Zhe Qu;Li Pi;Wei Tong;Mingliang Tian
铬离子掺杂的Y型六角铁氧体Ba0.5Sr1.5Zn2Fe11.4Cr0.6O22是一种很有前途的磁电材料，可以在较低的磁场下实现非零自发电极化的逆转。然而，磁电关联的潜在机制是什么，以及这种关联是如何随着温度和磁场的变化而演变的，仍然是一个悬而未决的问题。在这里，我们通过磁化强度、介电常数和电极化的综合测量和分析，建立了详细的相图。在不同的温度和磁场尺度下，发现了不同的磁相和铁电相，以及复杂而有趣的相变。在183K，一种新出现的转变将低场铁电相分成两个区域，分别具有反转和非反转极化，这在各种磁电铁氧体中是很少观察到的。提出了可能的与场相关的磁结构来定性地解释这种转变。
The Cr ion doped Y-type hexaferrite Ba0.5Sr1.5Zn2Fe11.4Cr0.6O22 has been found to be a promising magnetoelectric material for the non-zero spontaneous electric polarization that can be reversed by a relatively low magnetic field. However, it remains an open question what the underlying mechanism of the magnetoelectric correlation is and how this correlation evolves with the varying temperature and magnetic field. Here we establish a detailed phase diagram via the combined measurements and analyses of magnetization, dielectric constant, and electric polarization. Various magnetic and ferroelectric phases are discovered for different scales of temperature and magnetic field, as well as the complicated and intriguing phase transitions. A newly emerging transition at 183 K separates the low-field ferroelectric phase into two regions with reversal and non-reversal polarizations, respectively, which is rarely observed among various magnetoelectric ferrites. Possible field-dependent magnetic structures are proposed to qualitatively explain this transition.