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

Abstract

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.

Authors:
 [1];  [2];  [2];  [3];  [3];  [3];  [1]
+ Show Author Affiliations
  1. Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1634034
Alternate Identifier(s):
OSTI ID: 1368431
Grant/Contract Number:  
AC02-05CH11231; SC0008505; AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Materials
Additional Journal Information:
Journal Volume: 1; Journal Issue: 2; Journal ID: ISSN 2475-9953
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE

Citation Formats

Flint, C. L., Jang, H., Lee, J.-S., N'Diaye, A. T., Shafer, P., Arenholz, E., and Suzuki, Y. Role of polar compensation in interfacial ferromagnetism of LaNiO3/CaMnO3 superlattices. United States: N. p., 2017. Web. doi:10.1103/physrevmaterials.1.024404.
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Flint, C. L., Jang, H., Lee, J.-S., N'Diaye, A. T., Shafer, P., Arenholz, E., & Suzuki, Y. Role of polar compensation in interfacial ferromagnetism of LaNiO3/CaMnO3 superlattices. United States. https://doi.org/10.1103/physrevmaterials.1.024404
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Flint, C. L., Jang, H., Lee, J.-S., N'Diaye, A. T., Shafer, P., Arenholz, E., and Suzuki, Y. Wed . "Role of polar compensation in interfacial ferromagnetism of LaNiO3/CaMnO3 superlattices". United States. https://doi.org/10.1103/physrevmaterials.1.024404. https://www.osti.gov/servlets/purl/1634034.
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@article{osti_1634034,
title = {Role of polar compensation in interfacial ferromagnetism of LaNiO3/CaMnO3 superlattices},
author = {Flint, C. L. and Jang, H. and Lee, J.-S. and N'Diaye, A. T. and Shafer, P. and Arenholz, E. and Suzuki, Y.},
abstractNote = {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.},
doi = {10.1103/physrevmaterials.1.024404},
journal = {Physical Review Materials},
number = 2,
volume = 1,
place = {United States},
year = {Wed Jul 05 00:00:00 EDT 2017},
month = {Wed Jul 05 00:00:00 EDT 2017}
}
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https://doi.org/10.1103/physrevmaterials.1.024404
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    Works referencing / citing this record:

    Tailoring colossal magnetoresistance and magnetoresistive memory effect by two-dimension-like phase competition in electron-doped manganite superlattices
    journal, June 2018

    • Xiang, Ping-Hua; Zhong, Ni; Sun, Lin
    • Journal of Physics D: Applied Physics, Vol. 51, Issue 27
    • DOI: 10.1088/1361-6463/aac86c

    Electronic Reconstructions in the Transition Metal–Free Heterostructures: LaAlO3/SrGeO3
    journal, November 2019

    Emergent c-axis magnetic helix in manganite-nickelate superlattices
    text, January 2018

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