Please use this identifier to cite or link to this item: https://doi.org/10.1038/s41427-018-0084-8
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
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