Ferromagnetism in Fe-doped MgO nanoparticles

• DOI: 10.1007/s10854-015-3713-9
• Publication Date: 2015-09-03T05:26:08Z
• Authors: Sumalin Phokha; Jutharatana Klink...; Sitchai Hunpratub; Kornkanok Boonserm; Ekaphan Swatsitang; Santi Maensiri
• Keywords: 0103 physical sciences; 02 engineering and technology; 0210 nano-technology; 01 natural sciences

This work reports the study on magnetic properties of Mg1−xFexO (x = 0, 0.05 and 0.07) nanoparticles prepared by the polymer pyrolysis method. Phase, valence states and magnetic properties of these samples were characterized using X-ray diffraction (XRD), transmission electron microscopy, X-ray absorption near edge structure (XANES) and vibrating sample magnetometer (VSM), respectively. The XRD results show that the samples have a phase nature of the cubic structure with constant crystallite size of 25 ± 2 nm. XANES spectra reveal the existence of Fe3+ ions in the samples. VSM measurements exhibit the room temperature ferromagnetism with a maximum magnetization of 1.60 emu/g for x = 0.07. The origin of ferromagnetism is fitted on the bound magnetic polaron (BMP) model to indicate the numbers of BMPs involving overlapping of polarons via oxygen vacancy defects.