Transition metal oxide thin films and heterostructures are promising platforms to achieve full control of the antiferromagnetic (AFM) domain structure in patterned features as needed for AFM spintronic devices. In this work, soft x-ray photoemission electron microscopy was utilized to image AFM domains in micromagnets patterned into La0.7Sr0.3FeO3 (LSFO) thin films and La0.7Sr0.3MnO3 (LSMO)/LSFO superlattices. A delicate balance exists between magnetocrystalline anisotropy, shape anisotropy, and exchange interactions such that the AFM domain structure can be controlled using parameters such as LSFO and LSMO layer thickness, micromagnet shape, and temperature. In LSFO thin films, shape anisotropy gains importance only in micromagnets where at least one extended edge is aligned parallel to an AFM easy axis. In contrast, in the limit of ultrathin LSFO layers in the LSMO/LSFO superlattice, shape anisotropy effects dominate such that the AFM spin axes at micromagnet edges can be aligned along any in-plane crystallographic direction.

中文翻译：

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控制图案化 La0.7Sr0.3FeO3 薄膜中的反铁磁畴

过渡金属氧化物薄膜和异质结构是有前途的平台，可以根据 AFM 自旋电子器件的需要，完全控制图案化特征中的反铁磁 (AFM) 畴结构。在这项工作中，软 X 射线光电电子显微镜被用来对微磁体中的 AFM 域成像，这些微磁体被图案化为 La0.7Sr0.3FeO3 (LSFO) 薄膜和 La0.7Sr0.3MnO3 (LSMO)/LSFO 超晶格。磁晶各向异性、形状各向异性和交换相互作用之间存在微妙的平衡，因此可以使用 LSFO 和 LSMO 层厚度、微磁体形状和温度等参数控制 AFM 域结构。在 LSFO 薄膜中，形状各向异性仅在微磁体中变得重要，其中至少一个延伸边缘与 AFM 易轴对齐。相比之下，