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Controlling magnetic anisotropy (MA) is important in a variety of
applications including magnetic memories, spintronic sensors, and
skyrmion-based data distribution. The perovskite manganite family provides a
fertile playground for complex, intricate, and potentially useful
structure-magnetism relations. Here we report on the MA that emerges in 10% Ru
substituted $La_{0.7}Sr_{0.3}MnO_{3}$ (Ru-LSMO) films for which strong
perpendicular magnetization and anisotropic in-plane magnetization are found.
These moderately compressively strained films possess a rich microstructure,
consisting of coherently strained phase which evolves into a one dimensional
(1D) periodically-modulated structure above a critical thickness. We illustrate
how 10% Ru substitution plays a crucial role behind the observed MA, and how
the structural distortion and 1D periodic structural modulation produce the
anisotropic in-plane magnetization. We highlight the practical significance of
the observed MA, which could pave the way towards the realization of
cutting-edge oxide-based room temperature spintronic memory devices.
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