Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/144644
Title: Controlling the magnetic properties of LaMnO3/SrTiO3 heterostructures by stoichiometry and electronic reconstruction : atomic-scale evidence
Authors: Li, Mengsha
Tang, Chunhua
Paudel, Tula R.
Song, Dongsheng
Lü, Weiming
Han, Kun
Huang, Zhen
Zeng, Shengwei
Wang, Renshaw Xiao
Yang, Ping
Ariando
Chen, Jingsheng
Venkatesan, Thirumalai
Tsymbal, Evgeny Y.
Li, Changjian
Pennycook, Stephen John
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2019
Source: Li, M., Tang, C., Paudel, T. R., Song, D., Lü, W., Han, K., . . . Pennycook, S. J. (2019). Controlling the magnetic properties of LaMnO3/SrTiO3 heterostructures by stoichiometry and electronic reconstruction : atomic-scale evidence. Advanced Materials, 31(27), 1901386-. doi:10.1002/adma.201901386
Journal: Advanced Materials
Abstract: Interface‐driven magnetic effects and phenomena associated with spin–orbit coupling and intrinsic symmetry breaking are of importance for fundamental physics and device applications. How interfaces affect the interplay between charge, spin, orbital, and lattice degrees of freedom is the key to boosting device performance. In LaMnO3/SrTiO3 (LMO/STO) polar–nonpolar heterostructures, electronic reconstruction leads to an antiferromagnetic to ferromagnetic transition, making them viable for spin filter applications. The interfacial electronic structure plays a critical role in the understanding of the microscopic origins of the observed magnetic phase transition, from antiferromagnetic at 5 unit cells (ucs) of LMO or below to ferromagnetic at 6 ucs or above, yet such a study is missing. Here, an atomic scale understanding of LMO/STO ambipolar ferromagnetism is offered by quantifying the interface charge distribution and performing first‐principles density functional theory (DFT) calculations across this abrupt magnetic transition. It is found that the electronic reconstruction is confined within the first 3 ucs of LMO from the interface, and more importantly, it is robust against oxygen nonstoichiometry. When restoring stoichiometry, an enhanced ferromagnetic insulating state in LMO films with a thickness as thin as 2 nm (5 uc) is achieved, making LMO readily applicable as barriers in spin filters.
URI: https://hdl.handle.net/10356/144644
ISSN: 0935-9648
DOI: 10.1002/adma.201901386
Rights: This is the accepted version of the following article: Li, M., Tang, C., Paudel, T. R., Song, D., Lü, W., Han, K., . . . Pennycook, S. J. (2019). Controlling the magnetic properties of LaMnO3/SrTiO3 heterostructures by stoichiometry and electronic reconstruction : atomic-scale evidence. Advanced Materials, 31(27), 1901386-. doi:10.1002/adma.201901386, which has been published in final form at http://doi.org/10.1002/adma.201901386. This article may be used for non-commercial purposes in accordance with the Wiley Self-Archiving Policy [https://authorservices.wiley.com/authorresources/Journal-Authors/licensing/self-archiving.html].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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