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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 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}
}

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Works referenced in this record:

Physical Origins of the New Magnetoresistance in Pt / YIG
journal, June 2014


Topotactic Phase Transformation of the Brownmillerite SrCoO 2.5 to the Perovskite SrCoO 3- δ
journal, July 2013


Spin-Glass Behavior and Magnetic Phase Diagram of La 1- x Sr x CoO 3 ( 0 ≤ x ≤0.5) Studied by Magnetization Measurements
journal, April 1994

  • Itoh, Masayuki; Natori, Ikuomi; Kubota, Satoshi
  • Journal of the Physical Society of Japan, Vol. 63, Issue 4
  • DOI: 10.1143/JPSJ.63.1486

Control of Spin Waves in a Thin Film Ferromagnetic Insulator through Interfacial Spin Scattering
journal, September 2011


Reversal of the Lattice Structure in SrCoO x Epitaxial Thin Films Studied by Real-Time Optical Spectroscopy and First-Principles Calculations
journal, August 2013


Highly insulating ferromagnetic cobaltite heterostructures
journal, May 2017

  • Choi, Woo Seok; Kang, Kyeong Tae; Jeen, Hyoungjeen
  • Current Applied Physics, Vol. 17, Issue 5
  • DOI: 10.1016/j.cap.2017.02.013

Magnetic and Transport Properties of the System La1-xSrxCoO3-δ (0 < x ≤ 0.50)
journal, September 1995

  • Senarı́s-Rodrıiguez, M.; Goodenough, J.
  • Journal of Solid State Chemistry, Vol. 118, Issue 2, p. 323-336
  • DOI: 10.1006/jssc.1995.1351

Reversible redox reactions in an epitaxially stabilized SrCoOx oxygen sponge
journal, August 2013

  • Jeen, Hyoungjeen; Choi, Woo Seok; Biegalski, Michael D.
  • Nature Materials, Vol. 12, Issue 11
  • DOI: 10.1038/nmat3736

Dimensionality Control of d-orbital Occupation in Oxide Superlattices
journal, August 2014

  • Jeong, Da Woon; Choi, Woo Seok; Okamoto, Satoshi
  • Scientific Reports, Vol. 4, Issue 1
  • DOI: 10.1038/srep06124

Anomalous magnetism in strained La1-xSrxCoO3 epitaxial films (0 ≤ x ≤ 0.5)
journal, August 2014

  • Yang, H. W.; Zhang, H. R.; Li, Y.
  • Scientific Reports, Vol. 4, Issue 1
  • DOI: 10.1038/srep06206

Spin selective transport at the ferromagnet/semiconductor interface
journal, October 2003


Proximity-Induced Ferromagnetism in Graphene Revealed by the Anomalous Hall Effect
journal, January 2015


Strongly Coupled Magnetic and Electronic Transitions in Multivalent Strontium Cobaltites
journal, November 2017


Technique for measuring the reflectance of irregular, submillimeter-sized samples
journal, January 1993

  • Homes, Christopher C.; Reedyk, M.; Cradles, D. A.
  • Applied Optics, Vol. 32, Issue 16
  • DOI: 10.1364/AO.32.002976

Strain-induced high-temperature perovskite ferromagnetic insulator
journal, March 2018

  • Meng, Dechao; Guo, Hongli; Cui, Zhangzhang
  • Proceedings of the National Academy of Sciences, Vol. 115, Issue 12
  • DOI: 10.1073/pnas.1707817115

Suppression of spin-state transition in epitaxially strained LaCoO 3
journal, November 2008


Tuning the magnetic properties of La Co O 3 thin films by epitaxial strain
journal, January 2008


Thermally induced insulator-metal transition in LaCoO 3 :   A view based on the Mott transition
journal, July 1998


Spin Seebeck insulator
journal, September 2010

  • Uchida, K.; Xiao, J.; Adachi, H.
  • Nature Materials, Vol. 9, Issue 11
  • DOI: 10.1038/nmat2856

Spin-state configuration induced faster spin dynamics in epitaxial La1−xSrxCoO3 thin films
journal, May 2015


Electrical transport properties of La 1− x Sr x CoO 3 thin films
journal, October 2016

  • Liu, Bin; Wang, Yiqian; Liu, Guiju
  • Journal of Applied Physics, Vol. 120, Issue 15
  • DOI: 10.1063/1.4964946

Direct observation of double exchange in ferromagnetic La 0.7 Sr 0.3 CoO 3 by broadband ellipsometry
journal, January 2018


Ferromagnetic order in epitaxially strained La Co O 3 thin films
journal, April 2007


Magnetic properties of Co/Ni grain boundaries after annealing
journal, May 2018

  • Coutts, Chris; Arora, Monika; Hübner, René
  • AIP Advances, Vol. 8, Issue 5
  • DOI: 10.1063/1.5007689

Structural effects on the spin-state transition in epitaxially strained LaCoO 3 films
journal, February 2009


Strain-Induced Spin States in Atomically Ordered Cobaltites
journal, January 2012

  • Choi, Woo Seok; Kwon, Ji-Hwan; Jeen, Hyoungjeen
  • Nano Letters, Vol. 12, Issue 9
  • DOI: 10.1021/nl302562f