Abstract
In this paper, SrFe12O19@ZnFe2O4(Sr@Zn) core–shell composite fibers with molar ratios of 1:1,1:2,1:3,1:4 were prepared by coaxial electrostatic spinning. XRD revealed the coexistence of hexagonal ferrite and spinel phases in different proportions in the prepared composites. SEM and TEM showed that all samples showed the obvious fiber structure with uniform diameter distribution and length up to several microns. With the change of the molar ratio of soft magnetic phase, the magnetic properties of the composite first increase and then decrease, and the M2 composite exhibits the highest Ms(55 emu/g), Hc(4745 Oe) and Mr/Ms(0.51). In addition, the single-phase magnetization behavior of the hysteresis loop and the highest single peak in the SFD curve also confirm that the exchange coupling interaction of M2 composite is the highest. By adjusting the molar ratio of soft phase, the magnetic properties and exchange coupling effects of the composites are improved, which provides evidence for the development of composites with higher magnetic properties.
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