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Room Temperature Electric‐Field Control of Magnetism in Layered Oxides with Cation Order
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2016-12-12 , DOI: 10.1002/adfm.201604312 Xue-Zeng Lu 1 , James M. Rondinelli 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2016-12-12 , DOI: 10.1002/adfm.201604312 Xue-Zeng Lu 1 , James M. Rondinelli 1
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Searching for materials with room‐temperature electric‐field control of magnetism has interested researchers for many years with three‐dimensional perovskite BiFeO3‐based compounds as the main focus. Here we choose the layered hybrid improper ferroelectric Ruddlesden‐Popper oxides as a platform from which to realize electric field controllable magnetism, leveraging a recently identified strain tunable polar‐to‐nonpolar (P‐NP) transition. We first propose a design principle for selecting the required A and B cation chemistries that will ensure (001) A3B2O7 films exhibit P‐NP transitions, which we substantiate with density functional calculations. By extending the guideline to B‐site ordered A3BB′O7 oxides, we identify more compounds exhibiting P‐NP transitions marked by the disappearance of an in‐plane polarization that can be functionalized. We then demonstrate that weak ferromagnetism can be tuned by an electric field at the boundary of the P‐NP transition in B‐site ordered (001) A3BB′O7 magnetic films, based on which we predict that cation ordered Ca3TcTiO7 may be a viable candidate for room‐temperature electric‐field control of magnetism.
中文翻译：
阳离子序的层状氧化物中室温磁场的磁场控制
多年来，寻找具有磁性的室温电场控制材料的研究人员一直对以三维钙钛矿BiFeO 3基化合物为主要研究对象感兴趣。在这里，我们选择层状混合不当铁电Ruddlesden-Popper氧化物作为平台，利用最近确定的应变可调极性到非极性（P-NP）跃迁来实现电场可控的磁性。我们首先提出一种设计原则，用于选择所需的A和B阳离子化学物质，以确保（001）A 3 B 2 O 7膜具有P-NP跃迁，我们通过密度泛函计算来证实这一点。通过将指南扩展到B站点订购的A 3 BB'O在7种氧化物中，我们发现更多的化合物表现出P-NP跃迁，其特征是可以进行功能化的面内极化消失。然后，我们证明了弱铁磁性可以通过B位有序（001）A 3 BB'O 7磁性薄膜中P-NP跃迁的边界处的电场来调谐，基于此我们可以预测阳离子有序Ca 3 TcTiO 7可能是室温室温磁场控制的可行选择。
更新日期：2016-12-12
中文翻译：
阳离子序的层状氧化物中室温磁场的磁场控制
多年来，寻找具有磁性的室温电场控制材料的研究人员一直对以三维钙钛矿BiFeO 3基化合物为主要研究对象感兴趣。在这里，我们选择层状混合不当铁电Ruddlesden-Popper氧化物作为平台，利用最近确定的应变可调极性到非极性（P-NP）跃迁来实现电场可控的磁性。我们首先提出一种设计原则，用于选择所需的A和B阳离子化学物质，以确保（001）A 3 B 2 O 7膜具有P-NP跃迁，我们通过密度泛函计算来证实这一点。通过将指南扩展到B站点订购的A 3 BB'O在7种氧化物中，我们发现更多的化合物表现出P-NP跃迁，其特征是可以进行功能化的面内极化消失。然后，我们证明了弱铁磁性可以通过B位有序（001）A 3 BB'O 7磁性薄膜中P-NP跃迁的边界处的电场来调谐，基于此我们可以预测阳离子有序Ca 3 TcTiO 7可能是室温室温磁场控制的可行选择。
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