Mechanism‐based tuning of room‐temperature ferromagnetism in Mn‐doped β‐Ga2O3 by annealing atmosphere

Mn‐doped β‐Ga2O3 (GMO) films with room‐temperature ferromagnetism (RTFM) are synthesized by polymer‐assisted deposition, and the effects of annealing atmosphere (air or pure O2 gas) on their structures and physical properties are investigated. The characterizations show that the concentrations of va...

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Bibliographic Details
Published inJournal of the American Ceramic Society Vol. 106; no. 1; pp. 374 - 380
Main Authors Dai, Xu, Zhang, Xi, Xiang, Gang
Format Journal Article
LanguageEnglish
Published Columbus Wiley Subscription Services, Inc 01.01.2023
Subjects
Annealing
annealing atmosphere
bound magnetic polaron
Ferromagnetism
Gallium oxides
Lattice parameters
Lattice vacancies
Magnetic moments
Magnetic saturation
Manganese ions
Mn‐doped Ga2O3
oxygen vacancies
Physical properties
room‐temperature ferromagnetism
Tuning
Valence
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Summary:Mn‐doped β‐Ga2O3 (GMO) films with room‐temperature ferromagnetism (RTFM) are synthesized by polymer‐assisted deposition, and the effects of annealing atmosphere (air or pure O2 gas) on their structures and physical properties are investigated. The characterizations show that the concentrations of vacancy defects and Mn dopants in various valence states and lattice constants of the samples are all modulated by the annealing atmosphere. Notably, the samples annealed in air (GMO–air) exhibit a saturation magnetization as strong as 170% times that of the samples annealed in pure O2 gas (GMO–O2), which can be quantitatively explained by oxygen vacancy (VO)‐controlled ferromagnetism due to bound magnetic polarons established between delocalized hydrogenic electrons of VOs and local magnetic moments of Mn2+, Mn3+, and Mn4+ ions in the samples. Our results provide insights into mechanism‐based tuning of RTFM in Ga2O3 and may be useful for design, fabrication, and application of related spintronic materials.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.18733