Exchange-Interaction-Like Behavior in Ferroelectric Bilayers,Advanced Materials

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Exchange-Interaction-Like Behavior in Ferroelectric Bilayers
Advanced Materials ( IF 27.4 ) Pub Date : 2023-06-09 , DOI: 10.1002/adma.202301934
Pravin Kavle _{1,

2} , Aiden M Ross ₃ , Jacob A Zorn ₃ , Piush Behera _{1,

2} , Eric Parsonnet ₄ , Xiaoxi Huang _{1,

2} , Ching-Che Lin _{1,

2} , Lucas Caretta _{2,

5,

6} , Long-Qing Chen ₃ , Lane W Martin _{1,

2}

Affiliation

Interlayer coupling in materials, such as exchange interactions at the interface between an antiferromagnet and a ferromagnet, can produce exotic phenomena not present in the parent materials. While such interfacial coupling in magnetic systems is widely studied, there is considerably less work on analogous electric counterparts (i.e., akin to electric “exchange-bias-like” or “exchange-spring-like” interactions between two polar materials) despite the likelihood that such effects can also engender new features associated with anisotropic electric dipole alignment. Here, electric analogs of such exchange interactions are reported, and their physical origins are explained for bilayers of in-plane polarized Pb_1−xSr_xTiO₃ ferroelectrics. Variation of the strontium content and thickness of the layers provides for deterministic control over the switching properties of the bilayer system resulting in phenomena analogous to an exchange-spring interaction and, leveraging added control of these interactions with an electric field, the ability to realize multistate-memory function. Such observations not only hold technological promise for ferroelectrics and multiferroics but also extend the similarities between ferromagnetic and ferroelectric materials to include the manifestation of exchange-interaction-like phenomena.

中文翻译：

铁电双层中的类交换相互作用行为

材料中的层间耦合，例如反铁磁体和铁磁体之间界面处的交换相互作用，可能会产生母体材料中不存在的奇异现象。虽然磁系统中的这种界面耦合得到了广泛的研究，但对类似的电对应物（即类似于两种极性材料之间的电“交换偏压”或“交换弹簧”相互作用）的研究却相当少，尽管有可能这种效应还可以产生与各向异性电偶极子排列相关的新特征。在这里，报道了这种交换相互作用的电类似物，并解释了面内极化 Pb _1−x Sr _x TiO ₃铁电体双层的物理起源。层的锶含量和厚度的变化提供了对双层系统的开关特性的确定性控制，从而产生类似于交换弹簧相互作用的现象，并且利用对这些与电场的相互作用的附加控制，能够实现多态-记忆功能。这些观察结果不仅为铁电体和多铁性材料带来了技术前景，而且还扩展了铁磁材料和铁电材料之间的相似性，包括类似交换相互作用现象的表现。

更新日期：2023-06-09

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