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Two-dimensional magnetic materials exhibiting antiferromagnetic properties at room temperature offer significant potential for developing next generation spintronic nanodevices. This work presents controlled synthesis of two-dimensional magnetite (Fe 3 O 4 ) nanosheets utilizing lost cost and convenient chemical vapor deposition (CVD) technique, Raman spectroscopy study of laser-heating and annealing induced oxidation reaction. X-ray diffraction, X-ray photoelectron spectroscopy, atomic force microscopy, and Raman spectroscopy characterizations demonstrated that Fe 3 O 4 nanosheets down to about 10 nm with good crystalline quality, surface uniformity, and minimal defects can be obtained by optimizing the growth parameters in our CVD synthesis. Both laser-heating and annealing studies of Fe 3 O 4 nanosheets indicated that ferrimagnetic Fe 3 O 4 nanosheets gradually change to antiferromagnetic α -Fe 2 O 3 nanosheets at about 400 °C. Our study showed that Raman spectroscopy provides a convenient and powerful method for estimating heat-induced temperature and investigating oxidation reaction.
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Xiang et al. (2024) studied this question.
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