The Role of Interfacial Interactions and Oxygen Vacancies in Tuning Magnetic Anisotropy in LaCrO3/LaMnO3 Heterostructures

Zhang, Xuanyi; Al‐Tawhid, Athby H.; Schafer, Padraic; Zhang, Zhan; Kumah, Divine P.

doi:10.1002/admi.202400243

The Role of Interfacial Interactions and Oxygen Vacancies in Tuning Magnetic Anisotropy in LaCrO₃/LaMnO₃ Heterostructures

Journal Article · Tue Jul 23 00:00:00 EDT 2024 · Advanced Materials Interfaces

DOI:https://doi.org/10.1002/admi.202400243· OSTI ID:2440409

Zhang, Xuanyi ^[1]; Al‐Tawhid, Athby H. ^[2]; Schafer, Padraic ^[3]; Zhang, Zhan ^[4]; ^[5]

Duke Univ., Durham, NC (United States)
North Carolina State University, Raleigh, NC (United States)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Duke Univ., Durham, NC (United States); North Carolina State University, Raleigh, NC (United States)

The interplay of lattice, electronic, and spin degrees of freedom at epitaxial complex oxide interfaces provides a route to tune their magnetic ground states. Unraveling the competing contributions is critical for tuning their functional properties. The relationship between magnetic ordering and magnetic anisotropy and the lattice symmetry, oxygen content, and film thickness in compressively strained LaMnO₃ (LMO)/LaCrO₃ (LCO) superlattices is investigated. Mn–O–Cr antiferromagnetic superexchange interactions across the heterointerface result in a net ferrimagnetic magnetic structure. Bulk magnetometry measurements reveal isotropic in-plane magnetism for as-grown oxygen-deficient thin samples due to equal fractions of orthorhombic a+a-c-, and a-a+c- twin domains. As the superlattice thickness is increased, in-plane magnetic anisotropy emerges as the fraction of the a+a-c- domain increases. On annealing in oxygen, the suppression of oxygen vacancies results in a contraction of the lattice volume, and an orthorhombic to rhombohedral transition leads to isotropic magnetism independent of the film thickness. The complex interactions are investigated using high-resolution synchrotron diffraction and X-ray absorption spectroscopy. These results highlight the role of the evolution of structural domains with film thickness, interfacial spin interactions, and oxygen-vacancy-induced structural phase transitions in tuning the magnetic properties of complex oxide heterostructures.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC02-05CH11231; AC02-06CH11357

OSTI ID:: 2440409

Journal Information:: Advanced Materials Interfaces, Journal Name: Advanced Materials Interfaces Journal Issue: 25 Vol. 11; ISSN 2196-7350

Publisher:: Wiley-VCHCopyright Statement

Country of Publication:: United States

Language:: English

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