Role of polar compensation in interfacial ferromagnetism of LaNiO3/CaMnO3 superlattices

Flint, C. L.; Jang, H.; Lee, J.-S.; N'Diaye, A. T.; Shafer, P.; Arenholz, E.; Suzuki, Y.

doi:10.1103/physrevmaterials.1.024404

Role of polar compensation in interfacial ferromagnetism of LaNiO₃/CaMnO₃ superlattices

Journal Article · Wed Jul 05 00:00:00 EDT 2017 · Physical Review Materials

DOI:https://doi.org/10.1103/physrevmaterials.1.024404· OSTI ID:1634034

Flint, C. L. ^[1]; Jang, H. ^[2]; Lee, J.-S. ^[2]; N'Diaye, A. T. ^[3]; Shafer, P. ^[3]; Arenholz, E. ^[3]; Suzuki, Y. ^[1]

Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

Polar compensation can play an important role in the determination of interfacial electronic and magnetic properties in oxide heterostructures. Using x-ray absorption spectroscopy, x-ray magnetic circular dichroism, bulk magnetometry, and transport measurements, we find that interfacial charge redistribution via polar compensation is essential for explaining the evolution of interfacial ferromagnetism in LaNiO₃/CaMnO₃ superlattices as a function of LaNiO₃ layer thickness. In insulating superlattices (four unit cells or less of LaNiO₃), magnetism is dominated by Ni-Mn superexchange, while itinerant electron-based Mn-Mn double exchange plays a role in thicker metallic superlattices. X-ray magnetic circular dichroism and resonant x-ray scattering show that Ni-Mn superexchange contributes to the magnetization even in metallic superlattices. This Ni-Mn superexchange interaction can be explained in terms of polar compensation at the LaNiO₃-CaMnO₃ interface. Finally, these results highlight the different mechanisms responsible for interfacial ferromagnetism and the importance of understanding compensation due to polar mismatch at oxide-based interfaces when engineering magnetic properties.

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)

Grant/Contract Number:: AC02-05CH11231; AC02-76SF00515; SC0008505

OSTI ID:: 1634034

Alternate ID(s):: OSTI ID: 1368431

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 2 Vol. 1; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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