Dielectric screening and electric field control of ferromagnetism at the CaMnO3/CaRuO3 interface
Abstract
Control of magnetism by an applied electric field is a desirable technique for the functionalization of magnetic materials. Motivated by recent experiments, we study the electric field control of the interfacial magnetism of CaRuO3/CaMnO3 (CRO/CMO) (001), a prototype interface between a non-magnetic metal and an antiferromagnetic insulator. Even without the electric field, the interfacial CMO layer acquires a ferromagnetic moment due to a spin-canted state, caused by the Anderson-Hasegawa double exchange (DEX) between the Mn moments and the leaked electrons from the CRO side. An electric field would alter the carrier density at the interface, leading to the possibility of controlling the magnetism, since DEX is sensitive to the carrier density. We study this effect quantitatively using density-functional calculations in the slab geometry. We find a text-book like dielectric screening of the electric field, which introduces polarization charges at the interfaces and the surfaces. The extra charge at the interface enhances the ferromagnetism via the DEX interaction, while away from the interface the original AFM state of the Mn layers remains unchanged. The effect could have potential application in spintronics devices.
- Authors:
-
- Univ. of Missouri, Columbia, MO (United States); Ames Lab., and Iowa State Univ., Ames, IA (United States)
- Univ. of Missouri, Columbia, MO (United States)
- Publication Date:
- Research Org.:
- Univ. of Missouri, Columbia, MO (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
- OSTI Identifier:
- 1831276
- Grant/Contract Number:
- FG02-00ER45818
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 104; Journal Issue: 8; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Dielectric screening; Ferromagnetism; interface
Citation Formats
Bhandari, Churna, and Satpathy, S. Dielectric screening and electric field control of ferromagnetism at the CaMnO3/CaRuO3 interface. United States: N. p., 2021.
Web. doi:10.1103/physrevb.104.085134.
Bhandari, Churna, & Satpathy, S. Dielectric screening and electric field control of ferromagnetism at the CaMnO3/CaRuO3 interface. United States. https://doi.org/10.1103/physrevb.104.085134
Bhandari, Churna, and Satpathy, S. Tue .
"Dielectric screening and electric field control of ferromagnetism at the CaMnO3/CaRuO3 interface". United States. https://doi.org/10.1103/physrevb.104.085134. https://www.osti.gov/servlets/purl/1831276.
@article{osti_1831276,
title = {Dielectric screening and electric field control of ferromagnetism at the CaMnO3/CaRuO3 interface},
author = {Bhandari, Churna and Satpathy, S.},
abstractNote = {Control of magnetism by an applied electric field is a desirable technique for the functionalization of magnetic materials. Motivated by recent experiments, we study the electric field control of the interfacial magnetism of CaRuO3/CaMnO3 (CRO/CMO) (001), a prototype interface between a non-magnetic metal and an antiferromagnetic insulator. Even without the electric field, the interfacial CMO layer acquires a ferromagnetic moment due to a spin-canted state, caused by the Anderson-Hasegawa double exchange (DEX) between the Mn moments and the leaked electrons from the CRO side. An electric field would alter the carrier density at the interface, leading to the possibility of controlling the magnetism, since DEX is sensitive to the carrier density. We study this effect quantitatively using density-functional calculations in the slab geometry. We find a text-book like dielectric screening of the electric field, which introduces polarization charges at the interfaces and the surfaces. The extra charge at the interface enhances the ferromagnetism via the DEX interaction, while away from the interface the original AFM state of the Mn layers remains unchanged. The effect could have potential application in spintronics devices.},
doi = {10.1103/physrevb.104.085134},
journal = {Physical Review B},
number = 8,
volume = 104,
place = {United States},
year = {Tue Aug 17 00:00:00 EDT 2021},
month = {Tue Aug 17 00:00:00 EDT 2021}
}
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