In this study, ferroelectric Pb(Fe_1/2Nb_1/2)O₃ with an antiferromagnetic polymorph at and below 150 K was converted into a room-temperature magnetoelectrically active multiferroic with soft ferromagnetism by disrupting the existing antiparallel spin alignment of Fe ions through the heavy replacement of Fe by Ni. To maximize the induced soft-ferromagnetic properties and the consequent nonlinear magnetoelectric coupling, the substitution level of Ni should be controlled such that the individual Ni ions are separated from one another to avoid mutual spin cancellation. The induced magnetoelectric coupling was found to originate from the collective contribution of oppositely canted pairs of spins in two nearby Fe³⁺ ions, which counterbalances the relatively smaller spin moment of the in-between Ni ions. The non-material specific nature of this strategy implies that it can be used in the development of new room-temperature multiferroic perovskite oxides.

中文翻译：

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Pb(Fe1/2Nb1/2)O3 中的室温磁电耦合通过自旋倾斜抵消不平衡的自旋矩

在这项研究中，铁电 Pb(Fe _1/2 Nb _1/2 )O ₃在 150 K 及以下具有反铁磁性多晶型物，通过破坏现有的 Fe 离子反平行自旋排列，将其转化为具有软铁磁性的室温磁电活性多铁性通过用 Ni 大量替代 Fe。为了最大限度地提高感应软铁磁特性和随之而来的非线性磁电耦合，应控制 Ni 的取代水平，使单个 Ni 离子彼此分离以避免相互自旋抵消。发现感应磁电耦合源于两个附近 Fe ³⁺中相反倾斜的自旋对的集体贡献离子，它抵消了中间 Ni 离子相对较小的自旋矩。这种策略的非材料特性意味着它可以用于开发新的室温多铁性钙钛矿氧化物。