Fabrication and magnetic properties of sintered SrFe12O19-NiFe2O4 nanocomposites

Tran Thi Viet Nga, To Thanh Loan

Abstract


Two series of nanocomposite ferrites sintered at 850oC and 950oC, respectively, were prepared using SrFe12O19 and NiFe2O4 nanopowders obtained via a sol- gel method. The powders were then compacted and sintered in air. The phase composition, surface morphology and magnetic properties of the composites were investigated using XRD, SEM and VSM respectively. For the SrFe12O19/NiFe2O4 ferrites with RV ranging from 61 to 21 and sintered in 850oC for 5 hours in air, all the specimens are composed of two phases but exhibit a typical single- phase magnetic behavior, indicating the existence of exchange coupling (EC) between the magnetically hard and soft phases. The value of coercivity Hc decreases from 6.19 kOe to 0.574 kOe when volume of SrFe12O19 decrease from 6 to 1. While the samples with a mass ratio of Rm= SrFe12O19/ NiFe2O4 from 31 to 13 sintered in 950oC for 5 hours characterized with a “bee waist” type hysteresis loop, implying that the magnetically  hard and soft magnetic phases are not exchange coupled. The saturation magnetization (MS) increase from 36 emu/g to 43.3 emu/g when Rm decrease from 31 to 13 and then decrease with Rm= 12 and 13.

 


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