Perpendicular magnetic anisotropic materials are of great interest for their huge potential to realize high‐density nonvolatile memory and logic chips. Designing such materials with lower cost and better magnetoelectric coupling still remains major challenges. In this work, aurivillius oxide ceramics with highly [00l]‐oriented grains were prepared by a facile pressureless sintering method, and the perovskite layer number was modified by varying the cobalt content. Afterwards, the unique perpendicular magnetic anisotropy and the intriguing anisotropic ferroelectric properties have been observed. The magnetic properties of the Aurivillius oxides with different layer numbers have been carefully investigated by field cooling, zero field cooling, and the magnetization with a varying field. The magnetic anisotropy in the oriented ceramics is demonstrated to be caused by the magnetocrystalline anisotropy with the easy magnetization direction along the c‐axis, which possibly arises from the unquenched 3d orbitals combined with the special layered crystal structures. The magnetocrystalline anisotropy becomes weaker in the ceramics with lower numbered perovskite layers, whereas the orientation degree of the ceramics and the ferroelectric anisotropy show quite opposite trends. Furthermore, the weak magnetoelectric coupling is also observed in the ceramics. This special anisotropic multiferroic properties may open up a new window for the Aurivillius materials.

中文翻译：

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钙钛矿层数不同的Co / Fe共掺杂Aurivillius氧化物中的磁晶各向异性

垂直磁各向异性材料因其实现高密度非易失性存储器和逻辑芯片的巨大潜力而​​备受关注。设计具有较低成本和更好的磁电耦合的材料仍然是主要的挑战。在这项工作中，具有高度[ 00l通过简便的无压烧结方法制备[]取向的晶粒，并通过改变钴含量来改变钙钛矿层数。之后，已经观察到独特的垂直磁各向异性和有趣的各向异性铁电性能。通过场冷却，零场冷却和随场变化的磁化作用，已仔细研究了具有不同层数的Aurivillius氧化物的磁性。事实证明，定向陶瓷中的磁各向异性是由沿c轴易磁化方向的磁晶各向异性引起的，这可能是由于未淬火的3 d引起的。轨道结合特殊的分层晶体结构。在具有较少的钙钛矿层的陶瓷中，磁晶各向异性变弱，而陶瓷的取向度和铁电各向异性显示出完全相反的趋势。此外，在陶瓷中还观察到弱的磁电耦合。这种特殊的各向异性多铁性可能会为Aurivillius材料打开一个新的窗口。