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arXiv · 1707.03460

Tuning Perpendicular Magnetic Anisotropy by Oxygen Octahedral Rotations in (La$_{1-x}$Sr$_{x}$MnO$_{3}$)/(SrIrO$_{3}$) Superlattices

Di Yi·Charles L. Flint·Purnima P. Balakrishnan·Krishnamurthy Mahalingam·Brittany Urwin·Arturas Vailionis·Alpha T. NDiaye·Padraic Shafer·Elke Arenholz·Yongseong Choi·Kevin H. Stone·JiunHaw Chu·Brandon M. Howe·Jian Liu·Ian R. Fisher·Yuri Suzuki
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Abstract

Perpendicular magnetic anisotropy (PMA) plays a critical role in the development of spintronics, thereby demanding new strategies to control PMA. Here we demonstrate a conceptually new type of interface induced PMA that is controlled by oxygen octahedral rotation. In superlattices comprised of La$_{1-x}$Sr$_{x}$MnO$_{3}$ and SrIrO$_{3}$, we find that all superlattices (0$\leq$x$\leq$1) exhibit ferromagnetism despite the fact that La$_{1-x}$Sr$_{x}$MnO$_{3}$ is antiferromagnetic for x$>$0.5. PMA as high as 4$\times$10$^6$ erg/cm$^3$ is observed by increasing x and attributed to a decrease of oxygen octahedral rotation at interfaces. We also demonstrate that oxygen octahedral deformation cannot explain the trend in PMA. These results reveal a new degree of freedom to control PMA, enabling discovery of emergent magnetic textures and topological phenomena.

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Di Yi, Charles L. Flint, Purnima P. Balakrishnan, Krishnamurthy Mahalingam, Brittany Urwin, Arturas Vailionis, Alpha T. NDiaye, Padraic Shafer, Elke Arenholz, Yongseong Choi, Kevin H. Stone, JiunHaw Chu, Brandon M. Howe, Jian Liu, Ian R. Fisher, Yuri Suzuki. 2017-08-06. Tuning Perpendicular Magnetic Anisotropy by Oxygen Octahedral Rotations in (La$_{1-x}$Sr$_{x}$MnO$_{3}$)/(SrIrO$_{3}$) Superlattices. https://doi.org/10.1103/physrevlett.119.077201

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