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Title: ( LaCo O 3 ) n / ( SrCo O 2.5 ) n 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:
 [1];  [1];  [1]; ORCiD logo [2]; ORCiD logo [2];  [3]; ORCiD logo [1]
  1. Hanyang Univ., Seoul (Korea, Republic of). Dept. of Physics
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. 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 Lab. (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. doi: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. doi: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 = {2019},
month = {8}
}

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