Magnetoelectric Coupling Triggered by Noncollinear Magnetic Structure in M-Type Hexaferrite
Magnetoelectric Coupling Triggered by Noncollinear Magnetic Structure in M-Type Hexaferrite
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M型六角铁氧体中非共线磁结构触发的磁电耦合
DOI：
10.1002/qute.202000096
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Zhu Jinsong
中科院分区：
文献类型：
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作者：
Shao Ye;Huang Fengzhen;Zhang Junting;Yan Shuo;Xiao Shuyu;Lu Xiaomei;Zhu Jinsong
在多功能材料的技术应用中，磁序和铁电序之间的直接磁电耦合可以在螺旋磁体中实现。多磁化BaFe 12 O 19以其优异的磁、介电性能以及在高密度信息存储中的应用而引人注目，但其共线自旋结构限制了铁电体和ME耦合的出现。在这项工作中，非零的Dzyaloshinskiii-Moriya（DM）相互作用是通过部分取代自旋下降的Fe 3+位点来诱导BaFe 12 O 19中的锥形自旋结构。较大的In 3+离子被引入，并且更倾向于占据自旋下降的4f 1和4f 2晶格位置。磁化强度随温度的变化提供了锥形磁结构的证据。结果表明，In掺杂的BaFe_（12）O_（19）陶瓷具有直接的磁电耦合和磁介电耦合.建立了层间DM相互作用模型，讨论了晶体结构、非共线磁结构和离子替代之间的内在联系。此外，还制备了BaZn 0.9Zr 0.9Fe 10.2O 19陶瓷，并且由于Zn 2+和Zr 4+也具有比Fe 3+更大的半径并且更喜欢进入自旋下降位置，因此表现出非共线磁性结构和直接ME耦合。这一结果为普遍存在的M型六角铁氧体中的多铁性和磁电耦合提供了一条可行的途径。
Direct magnetoelectric (ME) coupling between magnetic and ferroelectric orders, which can be realized in spiral magnets, is vital in technological applications of multifunctional materials. Multisusceptible BaFe12O19is noteworthy for its excellent magnetic, dielectric properties and thus the application in high‐density information storage, while its collinear spin structure limits the emergence of ferroelectrics and ME coupling. In this work, nonzero Dzyaloshinskii–Moriya (DM) interaction is created by partial substitution of the spin‐down Fe3+sites to induce conical spin structure in BaFe12O19. Larger In3+ions are introduced and prefer to occupy the spin‐down 4f1and 4f2lattice sites. The evolution of magnetization versus temperature adduces evidence of conical magnetic structure. As a result, direct ME and magnetodielectric coupling are obtained in In‐doped BaFe12O19ceramics. An interlayer DM interaction model is built to discuss the intrinsic relationship among crystal structure, noncollinear magnetic structure, and ionic substitution. Moreover, BaZn0.9Zr0.9Fe10.2O19ceramics are also prepared, and exhibit noncollinear magnetic structure and direct ME coupling since Zn2+and Zr4+also possess larger radii than Fe3+and prefer to enter the spin‐down sites. The present result provides a feasible avenue to develop multiferroic and magnetoelectric coupling in ubiquitous M‐type hexaferrite.