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Room Temperature Electric-Field Control of Magnetism in Layered Oxides with Cation Order

机译:阳离子序的层状氧化物中磁场的室温电场控制

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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) A(3)B(2)O(7) films exhibit P-NP transitions, which we substantiate with density functional calculations. By extending the guideline to B-site ordered A(3)BBO(7) 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) A(3)BBO(7) magnetic films, based on which we predict that cation ordered Ca3TcTiO7 may be a viable candidate for room-temperature electric-field control of magnetism.
机译: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BiFeO3基化合物为主要研究对象感兴趣。在这里,我们选择层状杂化不当铁电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站点有序的A(3)BBO(7)氧化物,我们发现更多的化合物表现出P-NP跃迁,其特征在于可以被官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)BBO(7)磁性膜中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Ca3TcTiO7可能是室温磁场控制磁场的可行选择。

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