(LaCoO3)n/(SrCoO2.5)n superlattices: Tunable ferromagnetic insulator

Noh, S. J.; Ahn, G. H.; Seo, J. H.; Gai, Zheng; Lee, Ho Nyung; Choi, Woo Seok; Moon, Soon J.

doi:10.1103/physrevb.100.064415

${(LaCo O_{3})}_{n} / {(SrCo O_{2.5})}_{n}$ superlattices: Tunable ferromagnetic insulator

Journal Article · Thu Aug 22 00:00:00 EDT 2019 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.100.064415· OSTI ID:1561652

Noh, S. J. ^[1]; Ahn, G. H. ^[1]; Seo, J. H. ^[1]; ^[2]; ^[2]; Choi, Woo Seok ^[3]; ^[1]

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

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/(SrCoO_2.5)_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 T_C 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 T_C 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.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: Ministry of Science, ICT and Future Planning; USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1561652

Alternate ID(s):: OSTI ID: 1558702

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 6 Vol. 100; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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