Oxygen vacancies induced ferromagnetic behaviors in Co3O4–δ: An experimental and first-principles study

P. Wang; C. Jin; Peng Li; Dongxing Zheng; J. L. Gong; H. L. Bai

doi:10.1016/j.tsf.2018.06.022

Oxygen vacancies induced ferromagnetic behaviors in Co₃O_4–δ: An experimental and first-principles study

P. Wang, C. Jin^*, Peng Li, Dongxing Zheng, J. L. Gong, H. L. Bai

^*Corresponding author for this work

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

13 Scopus citations

Abstract

The structural and magnetic properties of Co₃O_4–δ were investigated by both first-principles and experimental studies. The results of first-principles calculations indicate that the spin splitting induced by oxygen vacancies can lead to the net moment in the Co₃O_3.875. The density of states of Co₃O₄ shows a band gap of 2.2 eV, while the impurity states appear with the oxygen vacancies. Furthermore, the Co₃O_4–δ films with oxygen vacancies were grown on MgAl₂O₄ and SrTiO₃ substrates by using reactive sputtering. The structural analysis reveals that the Co₃O_4–δ films are epitaxial. Consistent with the first-principles study, magnetism is observed in the Co₃O_4–δ films, which attributes to the oxygen vacancies influencing spin structure by superexchange interaction.

Original language	English (US)
Pages (from-to)	287-293
Number of pages	7
Journal	Thin Solid Films
Volume	660
DOIs	https://doi.org/10.1016/j.tsf.2018.06.022
State	Published - Aug 30 2018
Externally published	Yes

Keywords

Cobalt oxide
Direct-current magnetron reactive sputtering
Magnetism
Oxygen vacancy
Thin films
Transmission electron microscopy

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Metals and Alloys
Materials Chemistry
Surfaces, Coatings and Films
Surfaces and Interfaces

Access to Document

10.1016/j.tsf.2018.06.022

Cite this

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title = "Oxygen vacancies induced ferromagnetic behaviors in Co3O4–δ: An experimental and first-principles study",

abstract = "The structural and magnetic properties of Co3O4–δ were investigated by both first-principles and experimental studies. The results of first-principles calculations indicate that the spin splitting induced by oxygen vacancies can lead to the net moment in the Co3O3.875. The density of states of Co3O4 shows a band gap of 2.2 eV, while the impurity states appear with the oxygen vacancies. Furthermore, the Co3O4–δ films with oxygen vacancies were grown on MgAl2O4 and SrTiO3 substrates by using reactive sputtering. The structural analysis reveals that the Co3O4–δ films are epitaxial. Consistent with the first-principles study, magnetism is observed in the Co3O4–δ films, which attributes to the oxygen vacancies influencing spin structure by superexchange interaction.",

keywords = "Cobalt oxide, Direct-current magnetron reactive sputtering, Magnetism, Oxygen vacancy, Thin films, Transmission electron microscopy",

author = "P. Wang and C. Jin and Peng Li and Dongxing Zheng and Gong, {J. L.} and Bai, {H. L.}",

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T2 - An experimental and first-principles study

AU - Wang, P.

AU - Jin, C.

AU - Li, Peng

AU - Zheng, Dongxing

AU - Gong, J. L.

AU - Bai, H. L.

PY - 2018/8/30

Y1 - 2018/8/30

N2 - The structural and magnetic properties of Co3O4–δ were investigated by both first-principles and experimental studies. The results of first-principles calculations indicate that the spin splitting induced by oxygen vacancies can lead to the net moment in the Co3O3.875. The density of states of Co3O4 shows a band gap of 2.2 eV, while the impurity states appear with the oxygen vacancies. Furthermore, the Co3O4–δ films with oxygen vacancies were grown on MgAl2O4 and SrTiO3 substrates by using reactive sputtering. The structural analysis reveals that the Co3O4–δ films are epitaxial. Consistent with the first-principles study, magnetism is observed in the Co3O4–δ films, which attributes to the oxygen vacancies influencing spin structure by superexchange interaction.

AB - The structural and magnetic properties of Co3O4–δ were investigated by both first-principles and experimental studies. The results of first-principles calculations indicate that the spin splitting induced by oxygen vacancies can lead to the net moment in the Co3O3.875. The density of states of Co3O4 shows a band gap of 2.2 eV, while the impurity states appear with the oxygen vacancies. Furthermore, the Co3O4–δ films with oxygen vacancies were grown on MgAl2O4 and SrTiO3 substrates by using reactive sputtering. The structural analysis reveals that the Co3O4–δ films are epitaxial. Consistent with the first-principles study, magnetism is observed in the Co3O4–δ films, which attributes to the oxygen vacancies influencing spin structure by superexchange interaction.

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KW - Direct-current magnetron reactive sputtering

KW - Magnetism

KW - Oxygen vacancy

KW - Thin films

KW - Transmission electron microscopy

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