Room-Temperature Ferromagnetic Insulating State in Cation-Ordered Double-Perovskite Sr2Fe1+ xRe1− xO6Films

Changhee Sohn; Elizabeth Skoropata; Yongseong Choi; Xiang Gao; Ankur Rastogi; Amanda Huon; Michael A. McGuire; Lauren Nuckols; Yanwen Zhang; John W. Freeland; Daniel Haskel; Ho Nyung Lee

doi:10.1002/adma.201805389

Room-Temperature Ferromagnetic Insulating State in Cation-Ordered Double-Perovskite Sr₂Fe₁₊ _xRe₁₋ _xO₆Films

Changhee Sohn, Elizabeth Skoropata, Yongseong Choi, Xiang Gao, Ankur Rastogi, Amanda Huon, Michael A. McGuire, Lauren Nuckols, Yanwen Zhang, John W. Freeland, Daniel Haskel, Ho Nyung Lee

Research output: Contribution to journal › Article › peer-review

26 Scopus citations

Abstract

Ferromagnetic insulators (FMIs) are one of the most important components in developing dissipationless electronic and spintronic devices. However, FMIs are innately rare to find in nature as ferromagnetism generally accompanies metallicity. Here, novel room-temperature FMI films that are epitaxially synthesized by deliberate control of the ratio between two B-site cations in the double perovskite Sr₂Fe₁₊ _xRe_1- _xO₆ (−0.2 ≤ x ≤ 0.2) are reported. In contrast to the known FM metallic phase in stoichiometric Sr₂FeReO₆, an FMI state with a high Curie temperature (T_c ≈ 400 K) and a large saturation magnetization (M_S ≈ 1.8 µ_B f.u.⁻¹) is found in highly cation-ordered Fe-rich phases. The stabilization of the FMI state is attributed to the formation of extra Fe³⁺Fe³⁺ and Fe³⁺Re⁶⁺ bonding states, which originate from the relatively excess Fe ions owing to the deficiency in Re ions. The emerging FMI state created by controlling cations in the oxide double perovskites opens the door to developing novel oxide quantum materials and spintronic devices.

Original language	English
Article number	1805389
Journal	Advanced Materials
Volume	31
Issue number	4
DOIs	https://doi.org/10.1002/adma.201805389
State	Published - Jan 25 2019

Funding

This work was supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. This research used resources of the Center for Nanophase Materials Sciences (spectroscopic ellipsometry and STEM), which is a DOE Office of Science User Facility. Use of the Advanced Photon Source, which is also a DOE Office of Science User Facility, was supported by the US DOE, Office of Science, under Contract No. DE-AC02-06CH11357. L.N. was supported for the RBS work by the University of Tennessee Governor's Chair program. This work was supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. This research used resources of the Center for Nanophase Materials Sciences (spectroscopic ellipsometry and STEM), which is a DOE Office of Science User Facility. Use of the Advanced Photon Source, which is also a DOE Office of Science User Facility, was supported by the US DOE, Office of Science, under Contract No. DE-AC02-06CH11357. L.N. was supported for the RBS work by the University of Tennessee Governor’s Chair program.

Funders	Funder number
Center for Nanophase Materials Sciences
DOE Office of Science
University of Tennessee Governor
U.S. Department of Energy	DE-AC02-06CH11357
Office of Science
Basic Energy Sciences
Division of Materials Sciences and Engineering

Keywords

SrFeReO
epitaxy
ferromagnetic insulators
oxide perovskites
spectroscopy

Access to Document

10.1002/adma.201805389

Cite this

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title = "Room-Temperature Ferromagnetic Insulating State in Cation-Ordered Double-Perovskite Sr2Fe1+ xRe1− xO6Films",

abstract = "Ferromagnetic insulators (FMIs) are one of the most important components in developing dissipationless electronic and spintronic devices. However, FMIs are innately rare to find in nature as ferromagnetism generally accompanies metallicity. Here, novel room-temperature FMI films that are epitaxially synthesized by deliberate control of the ratio between two B-site cations in the double perovskite Sr2Fe1+ xRe1- xO6 (−0.2 ≤ x ≤ 0.2) are reported. In contrast to the known FM metallic phase in stoichiometric Sr2FeReO6, an FMI state with a high Curie temperature (Tc ≈ 400 K) and a large saturation magnetization (MS ≈ 1.8 µB f.u.−1) is found in highly cation-ordered Fe-rich phases. The stabilization of the FMI state is attributed to the formation of extra Fe3+Fe3+ and Fe3+Re6+ bonding states, which originate from the relatively excess Fe ions owing to the deficiency in Re ions. The emerging FMI state created by controlling cations in the oxide double perovskites opens the door to developing novel oxide quantum materials and spintronic devices.",

keywords = "SrFeReO, epitaxy, ferromagnetic insulators, oxide perovskites, spectroscopy",

author = "Changhee Sohn and Elizabeth Skoropata and Yongseong Choi and Xiang Gao and Ankur Rastogi and Amanda Huon and McGuire, {Michael A.} and Lauren Nuckols and Yanwen Zhang and Freeland, {John W.} and Daniel Haskel and Lee, {Ho Nyung}",

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AU - Sohn, Changhee

AU - Skoropata, Elizabeth

AU - Choi, Yongseong

AU - Gao, Xiang

AU - Rastogi, Ankur

AU - Huon, Amanda

AU - McGuire, Michael A.

AU - Nuckols, Lauren

AU - Zhang, Yanwen

AU - Freeland, John W.

AU - Haskel, Daniel

AU - Lee, Ho Nyung

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