Highly insulating ferromagnetic cobaltite heterostructures

Woo Seok Choi; Kyeong Tae Kang; Hyoungjeen Jeen; Zheng Gai; Ho Nyung Lee

doi:10.1016/j.cap.2017.02.013

Highly insulating ferromagnetic cobaltite heterostructures

Woo Seok Choi, Kyeong Tae Kang, Hyoungjeen Jeen, Zheng Gai, Ho Nyung Lee

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8 Scopus citations

Abstract

Ferromagnetic insulators are rather rare but possess great technological potential in, for example, spintronics. Individual control of ferromagnetic properties and electronic transport provides a useful design concept of multifunctional oxide heterostructures. We studied the close correlation among the magnetism, atomic structure, and electronic structure of oxide heterostructures composed of the ferromagnetic perovskite LaCoO₃ and the antiferromagnetic brownmillerite SrCoO_2.5 epitaxial thin film layers. By reversing the stacking sequence of the two layers, we could individually modify the electric resistance and saturation magnetic moment. The ferromagnetic insulating behavior in the heterostructures was understood in terms of the electronic reconstruction at the oxide surface/interfaces and crystalline quality of the constituent layers.

Original language	English
Pages (from-to)	722-726
Number of pages	5
Journal	Current Applied Physics
Volume	17
Issue number	5
DOIs	https://doi.org/10.1016/j.cap.2017.02.013
State	Published - May 1 2017

Funding

This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. The data analysis on the physical property measurements was supported by Basic Science Research Programs through the National Research Foundation of Korea (NRF-2014R1A2A2A01006478). The magnetic measurement was conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility.

Funders	Funder number
U.S. Department of Energy
Office of Science
Basic Energy Sciences
Division of Materials Sciences and Engineering
National Research Foundation of Korea	NRF-2014R1A2A2A01006478

Keywords

Cobaltite
Epitaxial heterostructre
Ferromagnetic insulator
Magnetism
Transition metal oxide

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10.1016/j.cap.2017.02.013

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abstract = "Ferromagnetic insulators are rather rare but possess great technological potential in, for example, spintronics. Individual control of ferromagnetic properties and electronic transport provides a useful design concept of multifunctional oxide heterostructures. We studied the close correlation among the magnetism, atomic structure, and electronic structure of oxide heterostructures composed of the ferromagnetic perovskite LaCoO3 and the antiferromagnetic brownmillerite SrCoO2.5 epitaxial thin film layers. By reversing the stacking sequence of the two layers, we could individually modify the electric resistance and saturation magnetic moment. The ferromagnetic insulating behavior in the heterostructures was understood in terms of the electronic reconstruction at the oxide surface/interfaces and crystalline quality of the constituent layers.",

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AU - Choi, Woo Seok

AU - Kang, Kyeong Tae

AU - Jeen, Hyoungjeen

AU - Gai, Zheng

AU - Lee, Ho Nyung

PY - 2017/5/1

Y1 - 2017/5/1

N2 - Ferromagnetic insulators are rather rare but possess great technological potential in, for example, spintronics. Individual control of ferromagnetic properties and electronic transport provides a useful design concept of multifunctional oxide heterostructures. We studied the close correlation among the magnetism, atomic structure, and electronic structure of oxide heterostructures composed of the ferromagnetic perovskite LaCoO3 and the antiferromagnetic brownmillerite SrCoO2.5 epitaxial thin film layers. By reversing the stacking sequence of the two layers, we could individually modify the electric resistance and saturation magnetic moment. The ferromagnetic insulating behavior in the heterostructures was understood in terms of the electronic reconstruction at the oxide surface/interfaces and crystalline quality of the constituent layers.

AB - Ferromagnetic insulators are rather rare but possess great technological potential in, for example, spintronics. Individual control of ferromagnetic properties and electronic transport provides a useful design concept of multifunctional oxide heterostructures. We studied the close correlation among the magnetism, atomic structure, and electronic structure of oxide heterostructures composed of the ferromagnetic perovskite LaCoO3 and the antiferromagnetic brownmillerite SrCoO2.5 epitaxial thin film layers. By reversing the stacking sequence of the two layers, we could individually modify the electric resistance and saturation magnetic moment. The ferromagnetic insulating behavior in the heterostructures was understood in terms of the electronic reconstruction at the oxide surface/interfaces and crystalline quality of the constituent layers.

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Highly insulating ferromagnetic cobaltite heterostructures

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Keywords

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