Direct neutron-diffraction-based measurement of magnetic order in brownmillerite SrCoO2.5 and La0.5Sr0.5CoO2.5 thin films

Postiglione, William M.; Liang, Jierui; Nandakumaran, Nileena; Figari, Lucca; Aczel, Adam A.; Leighton, Chris

doi:10.1063/5.0196646

Direct neutron-diffraction-based measurement of magnetic order in brownmillerite SrCoO_2.5 and La_0.5Sr_0.5CoO_2.5 thin films

Journal Article · Thu Apr 18 00:00:00 EDT 2024 · APL Materials

DOI:https://doi.org/10.1063/5.0196646· OSTI ID:2426044

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Univ. of Minnesota, Minneapolis, MN (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Epitaxial cobaltites have emerged as exemplary materials for electrochemical gating, in large part due to their topotactic perovskite (P) ↔ brownmillerite (BM) transformations. SrCoO_3-δ, for example, can be cycled between metallic ferromagnetic P SrCoO₃ and insulating BM SrCoO_2.5, realizing exceptional modulation of electronic, thermal, and optical properties. It is often presumed that such cycling also generates ferromagnetic–antiferromagnetic (F-AF) modulation due to the G-type AF order in bulk SrCoO_2.5. Little is understood about magnetism in thin-film BM SrCoO_2.5, however, meaning that the true magnetic property modulation is unclear. We address this here through a neutron diffraction study of BM La_1-xSr_xCoO_2.5 films at x = 0.5 and 1.0. Lightly compressively strained SrCoO_2.5 films are shown to retain G-type AF order, albeit with suppressed Néel temperature (~340 K). Of high interest for AF spintronics, room-temperature F–AF cycling is thus possible across the SrCoO_3-δ P ↔ BM transformation. At x = 0.5, however, BM La_0.5Sr_0.5CoO_2.5 films are found to exhibit no detectable G-type AF order but instead weak F order (Curie temperature ~115 K), unveiling a La_0.5Sr_0.5CoO_3-δ phase diagram with two distinct F phases. These results thus uncover new, unanticipated magnetic phase behavior in these materials, in addition to being directly relevant to cobaltite-based magnetoionics.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; SC0016371

OSTI ID:: 2426044

Journal Information:: APL Materials, Journal Name: APL Materials Journal Issue: 4 Vol. 12; ISSN 2166-532X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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