کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10156438 1666395 2019 25 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Role of precursor to solvent ratio in tuning the magnetization of iron oxide thin films - A sol-gel approach
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Role of precursor to solvent ratio in tuning the magnetization of iron oxide thin films - A sol-gel approach
چکیده انگلیسی
Iron oxide (Fe3O4, γ-Fe2O3 and α-Fe2O3) is a versatile material that can be utilized in various spintronic devices. However, there is a need to explore preparation methods that can result in three important iron oxide phases using single route. For this purpose, we here report low cost sol-gel method to optimize different phases of iron oxide with iron nitrate as precursor. Precursor to solvent (water and ethylene glycol) (P/S) ratio is varied in the range of 0.08-0.8 (interval 0.08). Magnetic properties of iron oxide sols show S-type ferromagnetic behavior with coercivity of ∼300Oe. X-ray diffraction (XRD) results, of spin coated thin films, confirm the formation of phase pure γ-Fe2O3, Fe3O4 and α-Fe2O3 at P/S ratio of 0.08-0.24, 0.48-0.56 and 0.72-0.80, respectively. Whereas, P/S ratios 0.32, 0.40 and 0.64 result in mixed iron oxide phases. Formation of phase pure γ-Fe2O3, Fe3O4 and α-Fe2O3 is also confirmed using Raman spectroscopy. High saturation magnetization of 224.09-287.29 emu/cm3, 467.5-490.42 emu/cm3 and 18.31-20.61 emu/cm3 is obtained for γ-Fe2O3 (P/S = 0.08-0.24), Fe3O4 (P/S = 0.48, 0.56) and α-Fe2O3 (P/S = 0.72-0.8), respectively. Increase in saturation magnetization and decrease in coercivity at P/S of 0.08-0.24, 0.48-0.56, 0.72-0.8 is correlated with decrease in magnetocrystalline anisotropy. FC/ZFC curves indicate Verwey transition in Fe3O4 thin films at ∼115 K while no such transition is observed in case of γ-Fe2O3 thin films. FC/ZFC curves for α-Fe2O3 thin films exhibit spontaneous magnetization at low temperatures.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 471, 1 February 2019, Pages 14-24
نویسندگان
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