Abstract
Abstract Hard/soft Co 0.5 La x Fe 2.5– x O 4 /CoFe composites have been synthesized by reduction process at 550 o C in 5% H 2 -Ar atmosphere. As the precursor, Co 0.5 La x Fe 2.5– x O 4 is prepared by the ball-milling-assisted ceramic process. High-crystallized spinel Co 0.5 La x Fe 2.5– x O 4 ferrites are formed after calcined at 900 o C in air for 2 h. The Co 0.5 Fe 2.5 O 4 shows the highest specific saturation magnetization (78.48 emu/g), remanence (30.82 emu/g), and effective anisotropy constant (62323.48 erg/g) compared with La 3+ -doped Co 0.5 La x Fe 2.5– x O 4 . By contrast, the specific saturation magnetization for Co 0.5 La 0.04 Fe 2.46 O 4 /CoFe composite, reduced at 550 o C for 20 min, exhibits an enhanced specific saturation magnetization (81.00 emu/g). The hysteresis loop for Co 0.5 La x Fe 2.5– x O 4 /CoFe composites exhibits a good single-phase magnetic behavior. The improvement in magnetic properties for Co 0.5 La x Fe 2.5– x O 4 /CoFe composites is attributed to the exchange–coupling interaction between the hard and soft phases.
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