"Tuning Perpendicular Magnetic Anisotropy by Oxygen Octahedral Rotations in La1-xSrxMnO3)/(SrIrO3) Superlattices"

Di Yi: Charles L. Flint, Purnima P. Balakrishnan, Krishnamurthy Mahalingam, Brittany Urwin, Arturas Vailionis, Alpha T. N’Diaye, Padraic Shafer, Elke Arenholz, Yongseong Choi, Kevin H. Stone, Jiun-Haw Chu, Brandon M. Howe, Jian Liu, Ian R. Fisher, and Yuri Suzuki; Physical Review Letters, 08/14/17.

Additional Authors: Charles L. Flint, Purnima P. Balakrishnan, Krishnamurthy Mahalingam, Brittany Urwin, Arturas Vailionis, Alpha T. N’Diaye, Padraic Shafer, Elke Arenholz, Yongseong Choi, Kevin H. Stone, Jiun-Haw Chu, Brandon M. Howe, Jian Liu, Ian R. Fisher, and Yuri Suzuki

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 La1−x SrxMnO3 and SrIrO3, we find that all superlattices (0 ≤ x ≤ 1) exhibit ferromagnetism despite the fact that La1−x SrxMnO3 is antiferromagnetic for x > 0.5. PMA as high as 4 × 106 erg=cm3 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.