superlattices: Tunable ferromagnetic insulator
Abstract
Ferromagnetic insulators have great potential for spintronic applications. For such applications, it is essential to find materials with a robust and controllable ferromagnetic insulating phase. Yet, because ferromagnetism in functional transition-metal oxides is usually coupled to metallicity, ferromagnetic insulators are very rare and independent control of their magnetic and electrical properties is difficult. In this study, the electrical, magnetic, and optical properties of (LaCoO3)n/(SrCoO2.5)n superlattice films are investigated for the manipulation of the ferromagnetic insulating phase. While the superlattices remain insulating irrespective of the periodicity n, the electronic structure and magnetic state vary drastically. Superlattices with large periodicities n of 10 and 20 show a ferromagnetic transition at a critical temperature TC of ~80K. With decreasing periodicity and increasing interface density of the superlattices, system with n=4 becomes almost nonmagnetic, while in systems with n=2 and 1, a reentrant ferromagnetic phase is observed at TC of ~180 and ~225K, respectively. Optical spectroscopy reveals that the fine control of the magnetic ground state is achieved by the modified electronic structure associated with the spin-state transition. Our findings indicate an important design principle to create and manipulate the ferromagnetic insulating properties of Co-based oxide thin films.
- Authors:
-
- Hanyang Univ., Seoul (Korea, Republic of). Dept. of Physics
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Sungkyunkwan Univ., Suwon (Republic of Korea). Dept. of Physics
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; Ministry of Science, ICT and Future Planning; USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1561652
- Alternate Identifier(s):
- OSTI ID: 1558702
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 100; Journal Issue: 6; 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
Citation Formats
Noh, S. J., Ahn, G. H., Seo, J. H., Gai, Zheng, Lee, Ho Nyung, Choi, Woo Seok, and Moon, Soon J. (LaCoO3)n/(SrCoO2.5)n superlattices: Tunable ferromagnetic insulator. United States: N. p., 2019.
Web. doi:10.1103/physrevb.100.064415.
Noh, S. J., Ahn, G. H., Seo, J. H., Gai, Zheng, Lee, Ho Nyung, Choi, Woo Seok, & Moon, Soon J. (LaCoO3)n/(SrCoO2.5)n superlattices: Tunable ferromagnetic insulator. United States. https://doi.org/10.1103/physrevb.100.064415
Noh, S. J., Ahn, G. H., Seo, J. H., Gai, Zheng, Lee, Ho Nyung, Choi, Woo Seok, and Moon, Soon J. Thu .
"(LaCoO3)n/(SrCoO2.5)n superlattices: Tunable ferromagnetic insulator". United States. https://doi.org/10.1103/physrevb.100.064415. https://www.osti.gov/servlets/purl/1561652.
@article{osti_1561652,
title = {(LaCoO3)n/(SrCoO2.5)n superlattices: Tunable ferromagnetic insulator},
author = {Noh, S. J. and Ahn, G. H. and Seo, J. H. and Gai, Zheng and Lee, Ho Nyung and Choi, Woo Seok and Moon, Soon J.},
abstractNote = {Ferromagnetic insulators have great potential for spintronic applications. For such applications, it is essential to find materials with a robust and controllable ferromagnetic insulating phase. Yet, because ferromagnetism in functional transition-metal oxides is usually coupled to metallicity, ferromagnetic insulators are very rare and independent control of their magnetic and electrical properties is difficult. In this study, the electrical, magnetic, and optical properties of (LaCoO3)n/(SrCoO2.5)n superlattice films are investigated for the manipulation of the ferromagnetic insulating phase. While the superlattices remain insulating irrespective of the periodicity n, the electronic structure and magnetic state vary drastically. Superlattices with large periodicities n of 10 and 20 show a ferromagnetic transition at a critical temperature TC of ~80K. With decreasing periodicity and increasing interface density of the superlattices, system with n=4 becomes almost nonmagnetic, while in systems with n=2 and 1, a reentrant ferromagnetic phase is observed at TC of ~180 and ~225K, respectively. Optical spectroscopy reveals that the fine control of the magnetic ground state is achieved by the modified electronic structure associated with the spin-state transition. Our findings indicate an important design principle to create and manipulate the ferromagnetic insulating properties of Co-based oxide thin films.},
doi = {10.1103/physrevb.100.064415},
journal = {Physical Review B},
number = 6,
volume = 100,
place = {United States},
year = {Thu Aug 22 00:00:00 EDT 2019},
month = {Thu Aug 22 00:00:00 EDT 2019}
}
Web of Science
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