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
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موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
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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 â¼300Oe. 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 224.09-287.29â¯emu/cm3, 467.5-490.42â¯emu/cm3 and 18.31-20.61â¯emu/cm3 is obtained for γ-Fe2O3 (P/Sâ¯=â¯0.08-0.24), Fe3O4 (P/Sâ¯=â¯0.48, 0.56) and α-Fe2O3 (P/Sâ¯=â¯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 â¼115â¯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
Journal: Journal of Magnetism and Magnetic Materials - Volume 471, 1 February 2019, Pages 14-24
نویسندگان
Aseya Akbar, Hassan Yousaf, Saira Riaz, Shahzad Naseem,