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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 
Lu, Weiming 
Han, Kun 
Huang, Zhen 
Zeng, Shengwei 
Wang, Xiao Renshaw
Yang, Ping 
Chen, Jingsheng 
Venkatesan, Thirumalai 
Tsymbal, Evgeny Y.
Li, Changjian 
Pennycook, Stephen John 
Keywords: Electronic reconstruction
Ferromagnetic insulators
Issue Date: 17-May-2019
Publisher: Wiley-VCH Verlag
Citation: Li, Mengsha, Tang, Chunhua, Paudel, Tula R., Song, Dongsheng, Lu, Weiming, Han, Kun, Huang, Zhen, Zeng, Shengwei, Wang, Xiao Renshaw, Yang, Ping, Ariando, Chen, Jingsheng, Venkatesan, Thirumalai, Tsymbal, Evgeny Y., Li, Changjian, Pennycook, Stephen John (2019-05-17). Controlling the Magnetic Properties of LaMnO3/SrTiO3 Heterostructures by Stoichiometry and Electronic Reconstruction: Atomic-Scale Evidence. ADVANCED MATERIALS 31 (27). ScholarBank@NUS Repository.
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. © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
ISSN: 09359648
DOI: 10.1002/adma.201901386
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