Orientation Control of Interfacial Magnetism at La0.67Sr0.33MnO3/SrTiO3 Interfaces

Guo, Er-Jia; Charlton, Timothy; Ambaye, Haile; Desautels, Ryan D.; Lee, Ho Nyung; Fitzsimmons, Michael R.

doi:10.1021/acsami.7b03252

Orientation Control of Interfacial Magnetism at La_0.67Sr_0.33MnO₃/SrTiO₃ Interfaces

Journal Article · Tue May 16 04:00:00 EDT 2017 · ACS Applied Materials and Interfaces

DOI:https://doi.org/10.1021/acsami.7b03252· OSTI ID:1362256

^[1]; Charlton, Timothy ^[1]; Ambaye, Haile ^[2]; Desautels, Ryan D. ^[1]; ^[3]; Fitzsimmons, Michael R. ^[4]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Instruments and Source Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy

Understanding the magnetism at the interface between a ferromagnet and an insulator is essential because the commonly posited magnetic “dead” layer close to an interface can be problematic in magnetic tunnel junctions. Previously, degradation of the magnetic interface was attributed to charge discontinuity across the interface. In this paper, the interfacial magnetism was investigated using three identically prepared La_0.67Sr_0.33MnO₃ (LSMO) thin films grown on different oriented SrTiO₃ (STO) substrates by polarized neutron reflectometry. In all cases the magnetization at the LSMO/STO interface is larger than the film bulk. We show that the interfacial magnetization is largest across the LSMO/STO interfaces with (001) and (111) orientations, which have the largest net charge discontinuities across the interfaces. In contrast, the magnetization of LSMO/STO across the (110) interface, the orientation with no net charge discontinuity, is the smallest of the three orientations. We show that a magnetically degraded interface is not intrinsic to LSMO/STO heterostructures. Finally, the approach to use different crystallographic orientations provides a means to investigate the influence of charge discontinuity on the interfacial magnetization.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Laboratory Directed Research and Development (LDRD) Program

Contributing Organization:: Univ. of Tennessee, Knoxville, TN (United States)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1362256

Journal Information:: ACS Applied Materials and Interfaces, Journal Name: ACS Applied Materials and Interfaces Journal Issue: 22 Vol. 9; ISSN 1944-8244

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Electrostatic potential and valence modulation in La0.7Sr0.3MnO3 thin films Trappen, Robbyn; Garcia-Castro, A. C.; Tra, Vu Thanh Scientific Reports, Vol. 8, Issue 1 https://doi.org/10.1038/s41598-018-32701-x	journal	September 2018
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Effect of oxygen stoichiometry on the magnetization profiles and negative magnetization in LSMO thin films Trappen, Robbyn; Grutter, Alexander J.; Huang, Chih-Yeh Journal of Applied Physics, Vol. 126, Issue 10 https://doi.org/10.1063/1.5111858	journal	September 2019
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Related Subjects

36 MATERIALS SCIENCE
charge discontinuity
interfacial magnetization
magnetic “dead” layer
polarized neutron reflectometry