Microstructure, magnetic properties and exchange–coupling interactions for one-dimensional hard/soft ferrite nanofibers

• Published in: Journal of solid state chemistry 2012-01, Vol.185, p.31-36
• Main Authors: Song, Fuzhan, Shen, Xiangqian, Liu, Mingquan, Xiang, Jun
• Format: Article
• Language: English
• Subjects: ALLOYS; CALCINATION; CARBON ADDITIONS; CHEMICAL REACTIONS; COMPETITION; Composite; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; COUPLING; DECOMPOSITION; Exact sciences and technology; Exchange; Exchange–coupling; FERRIMAGNETIC MATERIALS; FERRITE; FERRITES; Grains; INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; INTERACTIONS; IRON ALLOYS; IRON COMPOUNDS; Low-dimensional structures (superlattices, quantum well structures, multilayers): structure, and nonelectronic properties; MAGNETIC MATERIALS; MAGNETIC PROPERTIES; Magnetic properties and materials; Magnetic properties of nanostructures; Magnetic property; MASS; Mass ratios; MATERIALS; MICROSTRUCTURE; Nanofiber; Nanofibers; Nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals; NANOSTRUCTURES; OXYGEN COMPOUNDS; Phase distribution; PHYSICAL PROPERTIES; Physics; PYROLYSIS; Remanence; Structure of solids and liquids; crystallography; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties); THERMOCHEMICAL PROCESSES; TRANSITION ELEMENT ALLOYS; TRANSITION ELEMENT COMPOUNDS
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2011.10.009

SrFe12O19 (SFO)/Ni0.5Zn0.5Fe2O4 (NZFO) composite ferrite nanofibers with diameters about 120nm have been prepared by the electrospinning and calcination process. The SFO/NZFO composite ferrites are formed after calcined at 700°C for 2h and the composite nanofibers with various mass ratios obtained at 900°C are fabricated from NZFO grains about 16–40nm and SFO grains of 19–45nm with a uniform phase distribution. With the SFO ferrite content increasing, the coercivity (Hc) and remanence (Mr) for the composite ferrite nanofibers initially increase, reaching maximum values of 379.8kA/m (297K) and 242.2kA/m (77K), 39.1Am2/kg (297K) and 53.5Am2/kg (77K), respectively, at a mass ratio (SFO:NZFO) of 4, and then show a reduction tendency with a further increase of the mass ratio. This enhancement in magnetic properties is attributed to the competition of the exchange–coupling interaction and the dipolar interaction in the composite nanofibers. SrFe12O19 (SFO)/Ni0.5Zn0.5Fe2O4 (NZFO) composite ferrite nanofibers with a uniform phase distribution show competition of the exchange–coupling interaction and the dipolar interaction in the composite nanofibers. [Display omitted] ► Composite ferrite nanofibers have been prepared by the electrospinning. ► Magnetic exchange–coupling interaction for these nanofibers were analyzed. ► Nanofibers magnetic properties measured at 297K and 77K were discussed.