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Title: | Control of magnetic anisotropy by orbital hybridization with charge transfer in (La0.67Sr0.33MnO3)n/(SrTiO3)n superlattice | Authors: | Zhang, B. Wu, L. Zheng, J. Yang, P. Yu, X. Ding, J. Heald, S.M. Rosenberg, R.A. Venkatesan, T.V. Chen, J. Sun, C.-J. Zhu, Y. Chow, G.M. |
Issue Date: | 2018 | Publisher: | Nature Publishing Group | Citation: | Zhang, B., Wu, L., Zheng, J., Yang, P., Yu, X., Ding, J., Heald, S.M., Rosenberg, R.A., Venkatesan, T.V., Chen, J., Sun, C.-J., Zhu, Y., Chow, G.M. (2018). Control of magnetic anisotropy by orbital hybridization with charge transfer in (La0.67Sr0.33MnO3)n/(SrTiO3)n superlattice. NPG Asia Materials 10 (9) : 931-942. ScholarBank@NUS Repository. https://doi.org/10.1038/s41427-018-0084-8 | Rights: | Attribution 4.0 International | Abstract: | Abstract: The chemical asymmetry at the hetero-structure interface offers an effective opportunity to design desirable electronic structures by controlling charge transfer and orbital hybridization across the interface. However, controlling the hetero-interface remains a daunting task. Here, we report the modulation of interfacial coupling of (La0.67Sr0.33MnO3)n/(SrTiO3)n superlattices by manipulating the periodic thickness with n unit cells of SrTiO3 and n unit cells of La0.67Sr0.33MnO3 with a fixed thickness of ~120 unit cells. The easy axis of magnetic anisotropy rotates ~45° towards the out-of-plane direction from n = 10 to n = 2 at reduced temperature TRe =T/TS = 0.87, where TS is the temperature at the onset of magnetization. Transmission electron microscopy reveals an enlarged tetragonal ratio >1 with breaking of volume conservation around the (La0.67Sr0.33MnO3)n/(SrTiO3)n interface and electronic charge transfer from Mn to Ti 3d orbitals across the interface. Orbital hybridization accompanying the charge transfer results in preferred occupancy of 3d3z2-r2 orbitals at the interface and induces a stronger electronic hopping integral and interfacial magnetic anisotropy along the out-of-plane direction, which contributes to the rotation towards the out-of-plane direction of an effective magnetic easy axis for n = 2. We demonstrate that interfacial orbital hybridization with charge transfer in the superlattice of strongly correlated oxides may be a promising approach to tailor electronic and magnetic properties in device applications. © 2018, The Author(s). | Source Title: | NPG Asia Materials | URI: | https://scholarbank.nus.edu.sg/handle/10635/211681 | ISSN: | 1884-4049 | DOI: | 10.1038/s41427-018-0084-8 | Rights: | Attribution 4.0 International |
Appears in Collections: | Elements Staff Publications |
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