Site-specific spectroscopic measurement of spin and charge in (LuFeO3)m/(LuFe2O4)1 multiferroic superlattices
Abstract
Interface materials offer a means to achieve electrical control of ferrimagnetism at room temperature as was recently demonstrated in (LuFeO3)m/(LuFe2O4)1 superlattices. A challenge to understanding the inner workings of these complex magnetoelectric multiferroics is the multitude of distinct Fe centres and their associated environments. This is because macroscopic techniques characterize average responses rather than the role of individual iron centres. Here, we combine optical absorption, magnetic circular dichroism and first-principles calculations to uncover the origin of high-temperature magnetism in these superlattices and the charge-ordering pattern in the m = 3 member. In a significant conceptual advance, interface spectra establish how Lu-layer distortion selectively enhances the Fe2+ → Fe3+ charge-transfer contribution in the spin-up channel, strengthens the exchange interactions and increases the Curie temperature. Comparison of predicted and measured spectra also identifies a non-polar charge ordering arrangement in the LuFe2O4 layer. This site-specific spectroscopic approach opens the door to understanding engineered materials with multiple metal centres and strong entanglement.
- Authors:
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Univ. of Tennessee, Knoxville, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF); Japan Society for the Promotion of Science (JSPS); USDOE
- OSTI Identifier:
- 1702282
- Alternate Identifier(s):
- OSTI ID: 1764547; OSTI ID: 1831752; OSTI ID: 1865805
- Grant/Contract Number:
- AC02-05CH11231; FG02-01ER45885; SC0002334; DMR-1644779; DMR-1229217; DMR-1719875; DMR-1539918; 19K05246
- Resource Type:
- Published Article
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Name: Nature Communications Journal Volume: 11 Journal Issue: 1; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; multiferroic superlattices; interface effects; multiferroic superlattices, interface effects, magnetic circular dichroism, high temperature magnetism, charge ordering pattern
Citation Formats
Fan, Shiyu, Das, Hena, Rébola, Alejandro, Smith, Kevin A., Mundy, Julia, Brooks, Charles, Holtz, Megan E., Muller, David A., Fennie, Craig J., Ramesh, Ramamoorthy, Schlom, Darrell G., McGill, Stephen, and Musfeldt, Janice L. Site-specific spectroscopic measurement of spin and charge in (LuFeO3)m/(LuFe2O4)1 multiferroic superlattices. United Kingdom: N. p., 2020.
Web. doi:10.1038/s41467-020-19285-9.
Fan, Shiyu, Das, Hena, Rébola, Alejandro, Smith, Kevin A., Mundy, Julia, Brooks, Charles, Holtz, Megan E., Muller, David A., Fennie, Craig J., Ramesh, Ramamoorthy, Schlom, Darrell G., McGill, Stephen, & Musfeldt, Janice L. Site-specific spectroscopic measurement of spin and charge in (LuFeO3)m/(LuFe2O4)1 multiferroic superlattices. United Kingdom. https://doi.org/10.1038/s41467-020-19285-9
Fan, Shiyu, Das, Hena, Rébola, Alejandro, Smith, Kevin A., Mundy, Julia, Brooks, Charles, Holtz, Megan E., Muller, David A., Fennie, Craig J., Ramesh, Ramamoorthy, Schlom, Darrell G., McGill, Stephen, and Musfeldt, Janice L. Wed .
"Site-specific spectroscopic measurement of spin and charge in (LuFeO3)m/(LuFe2O4)1 multiferroic superlattices". United Kingdom. https://doi.org/10.1038/s41467-020-19285-9.
@article{osti_1702282,
title = {Site-specific spectroscopic measurement of spin and charge in (LuFeO3)m/(LuFe2O4)1 multiferroic superlattices},
author = {Fan, Shiyu and Das, Hena and Rébola, Alejandro and Smith, Kevin A. and Mundy, Julia and Brooks, Charles and Holtz, Megan E. and Muller, David A. and Fennie, Craig J. and Ramesh, Ramamoorthy and Schlom, Darrell G. and McGill, Stephen and Musfeldt, Janice L.},
abstractNote = {Interface materials offer a means to achieve electrical control of ferrimagnetism at room temperature as was recently demonstrated in (LuFeO3)m/(LuFe2O4)1 superlattices. A challenge to understanding the inner workings of these complex magnetoelectric multiferroics is the multitude of distinct Fe centres and their associated environments. This is because macroscopic techniques characterize average responses rather than the role of individual iron centres. Here, we combine optical absorption, magnetic circular dichroism and first-principles calculations to uncover the origin of high-temperature magnetism in these superlattices and the charge-ordering pattern in the m = 3 member. In a significant conceptual advance, interface spectra establish how Lu-layer distortion selectively enhances the Fe2+ → Fe3+ charge-transfer contribution in the spin-up channel, strengthens the exchange interactions and increases the Curie temperature. Comparison of predicted and measured spectra also identifies a non-polar charge ordering arrangement in the LuFe2O4 layer. This site-specific spectroscopic approach opens the door to understanding engineered materials with multiple metal centres and strong entanglement.},
doi = {10.1038/s41467-020-19285-9},
journal = {Nature Communications},
number = 1,
volume = 11,
place = {United Kingdom},
year = {Wed Nov 04 00:00:00 EST 2020},
month = {Wed Nov 04 00:00:00 EST 2020}
}
https://doi.org/10.1038/s41467-020-19285-9
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