Controlling the Magneto-Optical Response in Ultrathin Films of EuO1–x via Interface Engineering with Ferroelectric BaTi2O5

Shah, Syed Q. A.; Annaorazov, Muhammet; Rimal, Gaurab; Wang, Jian; Borunda, Mario F.; Tang, Jinke; Yost, Andrew J.

doi:10.1021/acsami.2c18842

Controlling the Magneto-Optical Response in Ultrathin Films of EuO_1–x via Interface Engineering with Ferroelectric BaTi₂O₅

Journal Article · Sun Feb 12 00:00:00 EST 2023 · ACS Applied Materials and Interfaces

DOI:https://doi.org/10.1021/acsami.2c18842· OSTI ID:2335340

Shah, Syed Q. A. ^[1]; Annaorazov, Muhammet ^[2]; Rimal, Gaurab ^[3]; Wang, Jian ^[4]; Borunda, Mario F. ^[2]; Tang, Jinke ^[5]; ^[2]

University of Nebraska-Lincoln, NE (United States); University of Wyoming
Oklahoma State University, Stillwater, OK (United States)
Rutgers University, Piscataway, NJ (United States); University of Wyoming, Laramie, WY (United States)
Canadian Light Source Inc., Saskatchewan (Canada)
University of Wyoming, Laramie, WY (United States)

Utilizing pulsed laser deposition, a film of EuO_1–x was deposited onto a Si(001) substrate with MgO buffer and compared to the same heterostructure with an additional BaTi₂O₅ thin film on top of the EuO_1–x surface. X-ray diffraction (XRD) indicates the films crystallize into a preferred EuO(111) orientation; it also reveals the clear presence of EuSi₂, which suggests Si or Eu diffuses across the MgO buffer layer. EuO_1–x films exhibit a ferromagnetic (FM) signature and temperature-dependent exchange bias, indicated by MOKE measurements, suggesting the presence of a magnetic order well above the EuO Curie temperature with possible origins in charge carrier density near the interface. In comparison, an antiferromagnetic character persists well above the EuO Curie temperature of 69 K and the enhanced Curie temperature of 150 K for BaTi₂O₅ films grown on the EuO_1–x films. Furthermore, the antiferromagnetic behavior is not seen in thicker EuO_1–x thin films when integrated with other ferroelectric (FE) phases of the BaO–TiO₂ system, suggesting an origin in the perturbed charge population at the BaTi₂O₅/EuO_1–x interface.

View Accepted Manuscript (DOE)

Research Organization:: University of Wyoming, Laramie, WY (United States)

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

Grant/Contract Number:: SC0020074

OSTI ID:: 2335340

Journal Information:: ACS Applied Materials and Interfaces, Journal Name: ACS Applied Materials and Interfaces Journal Issue: 7 Vol. 15; ISSN 1944-8244

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Controlling the Magneto-Optical Response in Ultrathin Films of EuO1–x via Interface Engineering with Ferroelectric BaTi2O5

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Controlling the Magneto-Optical Response in Ultrathin Films of EuO_1–x via Interface Engineering with Ferroelectric BaTi₂O₅