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Title: Magnetism in iridate heterostructures leveraged by structural distortions

Abstract

Fundamental control of magnetic coupling through heterostructure morphology is a prerequisite for rational engineering of magnetic ground states. We report the tuning of magnetic interactions in superlattices composed of single and bilayers of SrIrO3 inter-spaced with SrTiO3 in analogy to the Ruddlesden-Popper series iridates. Magnetic scattering shows predominately c-axis antiferromagnetic orientation of the magnetic moments for the bilayer, as in Sr3Ir2O7. However, the magnetic excitation gap, measured by resonant inelastic x-ray scattering, is quite different between the two structures, evidencing a significant change in the stability of the competing magnetic phases. In contrast, the single layer iridate hosts a more bulk-like gap. We find these changes are driven by bending of the caxis Ir-O-Ir bond, which is much weaker in the single layer, and subsequent local environment changes, evidenced through x-ray diffraction and magnetic excitation modeling. Our findings demonstrate how large changes in the magnetic interactions can be tailored and probed in spin-orbit coupled heterostructures by engineering subtle structural modulations.

Authors:
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Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Univ. of Tennessee, Knoxville, TN (United States); Chinese Academy of Sciences (CAS), Beijing (China)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Defense Advanced Research Projects Agency (DARPA) (United States); Ministry of Science and Technology (MOST) (China); Chinese Academy of Sciences (CAS) (China)
OSTI Identifier:
1619503
Alternate Identifier(s):
OSTI ID: 1501560; OSTI ID: 1515548
Report Number(s):
BNL-211401-2019-JAAM
Journal ID: ISSN 2045-2322; 4263; PII: 39422
Grant/Contract Number:  
SC0012704; 1047478; AC02- 06CH11357; AC02-06CH11357; HR0011-16-1-0005; 2015CB921302; XDB07020200
Resource Type:
Published Article
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Name: Scientific Reports Journal Volume: 9 Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United Kingdom
Language:
English
Subject:
36 MATERIALS SCIENCE; magnetic properties and materials; phase transitions and critical phenomena

Citation Formats

Meyers, D., Cao, Yue, Fabbris, G., Robinson, Neil J., Hao, Lin, Frederick, C., Traynor, N., Yang, J., Lin, Jiaqi, Upton, M. H., Casa, D., Kim, Jong-Woo, Gog, T., Karapetrova, E., Choi, Yongseong, Haskel, D., Ryan, P. J., Horak, Lukas, Liu, X., Liu, Jian, and Dean, M. P. M. Magnetism in iridate heterostructures leveraged by structural distortions. United Kingdom: N. p., 2019. Web. doi:10.1038/s41598-019-39422-9.
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Meyers, D., Cao, Yue, Fabbris, G., Robinson, Neil J., Hao, Lin, Frederick, C., Traynor, N., Yang, J., Lin, Jiaqi, Upton, M. H., Casa, D., Kim, Jong-Woo, Gog, T., Karapetrova, E., Choi, Yongseong, Haskel, D., Ryan, P. J., Horak, Lukas, Liu, X., Liu, Jian, & Dean, M. P. M. Magnetism in iridate heterostructures leveraged by structural distortions. United Kingdom. https://doi.org/10.1038/s41598-019-39422-9
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Meyers, D., Cao, Yue, Fabbris, G., Robinson, Neil J., Hao, Lin, Frederick, C., Traynor, N., Yang, J., Lin, Jiaqi, Upton, M. H., Casa, D., Kim, Jong-Woo, Gog, T., Karapetrova, E., Choi, Yongseong, Haskel, D., Ryan, P. J., Horak, Lukas, Liu, X., Liu, Jian, and Dean, M. P. M. Tue . "Magnetism in iridate heterostructures leveraged by structural distortions". United Kingdom. https://doi.org/10.1038/s41598-019-39422-9.
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@article{osti_1619503,
title = {Magnetism in iridate heterostructures leveraged by structural distortions},
author = {Meyers, D. and Cao, Yue and Fabbris, G. and Robinson, Neil J. and Hao, Lin and Frederick, C. and Traynor, N. and Yang, J. and Lin, Jiaqi and Upton, M. H. and Casa, D. and Kim, Jong-Woo and Gog, T. and Karapetrova, E. and Choi, Yongseong and Haskel, D. and Ryan, P. J. and Horak, Lukas and Liu, X. and Liu, Jian and Dean, M. P. M.},
abstractNote = {Fundamental control of magnetic coupling through heterostructure morphology is a prerequisite for rational engineering of magnetic ground states. We report the tuning of magnetic interactions in superlattices composed of single and bilayers of SrIrO3 inter-spaced with SrTiO3 in analogy to the Ruddlesden-Popper series iridates. Magnetic scattering shows predominately c-axis antiferromagnetic orientation of the magnetic moments for the bilayer, as in Sr3Ir2O7. However, the magnetic excitation gap, measured by resonant inelastic x-ray scattering, is quite different between the two structures, evidencing a significant change in the stability of the competing magnetic phases. In contrast, the single layer iridate hosts a more bulk-like gap. We find these changes are driven by bending of the caxis Ir-O-Ir bond, which is much weaker in the single layer, and subsequent local environment changes, evidenced through x-ray diffraction and magnetic excitation modeling. Our findings demonstrate how large changes in the magnetic interactions can be tailored and probed in spin-orbit coupled heterostructures by engineering subtle structural modulations.},
doi = {10.1038/s41598-019-39422-9},
journal = {Scientific Reports},
number = 1,
volume = 9,
place = {United Kingdom},
year = {Tue Mar 12 00:00:00 EDT 2019},
month = {Tue Mar 12 00:00:00 EDT 2019}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1038/s41598-019-39422-9
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Cited by: 21 works
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Figures / Tables:

FIG. 1. FIG. 1.: a) Structure of the two SLs. White arrows show in- plane magnetic exchange pathways and the pink arrow shows the out-of-plane exchange in the bilayer. b) Left panel: Inte- grated intensity as a function of the azimuthal angle for the (0.5, 0.5, 9.5) magnetic re ection of themore » 2SIO/1STO sample are shown as red circles, along with the expected response for c-axis (solid grey line) and in-plane moment orientations (blue dashed lines). Right panel: Normalized magnetic Bragg peaks at maximum azimuth (90°) and where no intensity is expected for in-plane moments (7°).« less
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Works referenced in this record:

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    TABLE I (p. 6)table
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