Direct experimental evidence of tunable charge transfer at the LaNiO3/CaMnO3 ferromagnetic interface

Paudel, J. R.; Terilli, M.; Wu, T. -C.; Grassi, Joseph D.; Derrico, A. M.; Sah, Raj K.; Kareev, Mikhail; Wen, F.; Klewe, Christoph; Shafer, P.; Gloskovskii, Andrei; Schlueter, Christoph; Strocov, V. N.; Chakhalian, J.; Gray, A. X.

doi:10.1103/physrevb.108.054441

Direct experimental evidence of tunable charge transfer at the LaNiO3 / CaMnO3 ferromagnetic interface

Journal Article · Tue Aug 29 00:00:00 EDT 2023 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.108.054441· OSTI ID:2281676

Paudel, J. R. ^[1]; Terilli, M. ^[2]; Wu, T. -C. ^[2]; ^[1]; Derrico, A. M. ^[1]; ^[1]; ^[2]; Wen, F. ^[2]; ^[3]; Shafer, P. ^[3]; ^[4]; ^[4]; Strocov, V. N. ^[5]; Chakhalian, J. ^[2]; Gray, A. X. ^[1]

Temple Univ., Philadelphia, PA (United States)
Rutgers Univ., Piscataway, NJ (United States)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
Paul Scherrer Inst. (PSI), Villigen (Switzerland). Swiss Light Source

Interfacial charge transfer in oxide heterostructures gives rise to a rich variety of electronic and magnetic phenomena. Designing heterostructures where one of the thin-film components exhibits a metal-insulator transition opens a promising avenue for controlling such phenomena both statically and dynamically. In this work, we utilize a combination of depth-resolved soft x-ray standing-wave and hard x-ray photoelectron spectroscopies in conjunction with polarization-dependent x-ray absorption spectroscopy to investigate the effects of the metal-insulator transition in LaNiO₃ on the electronic and magnetic states at the LaNiO₃/CaMnO₃ interface. Here, we report a direct observation of the reduced effective valence state of the interfacial Mn cations in the metallic superlattice with an above-critical LaNiO₃ thickness (6 unit cells, u.c.) facilitated by the charge transfer of itinerant Ni 3d e_g electrons into the interfacial CaMnO₃ layer. Conversely, in an insulating superlattice with a below-critical LaNiO₃ thickness of 2 u.c., a homogeneous effective valence state of Mn is observed throughout the CaMnO₃ layers due to the blockage of charge transfer across the interface. The ability to switch and tune interfacial charge transfer enables precise control of the emergent ferromagnetic state at the LaNiO₃/CaMnO₃ interface and, thus, has far-reaching consequences on the future strategies for the design of next-generation spintronic devices.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); Rutgers Univ., Piscataway, NJ (United States)

Sponsoring Organization:: US Army Research Office (ARO); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC02-05CH11231; SC0012375; SC0019297

OSTI ID:: 2281676

Alternate ID(s):: OSTI ID: 2338077

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 5 Vol. 108; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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