Abstract
Hard/soft Co0.6Mg0.15NdxFe2.25–xO4/Co composites have been synthesized by reducing Co0.6Mg0.15NdxFe2.25–xO4 (CMNFO) at 550 °C in 5% H2–Ar atmosphere. The results of X-ray diffraction measurements confirm that CMNFO samples, calcined at 900 °C, consist of the main cubic MgFe2O4 phase in combination of trace amounts of Fe2O3 and FeNdO3 phases. The surface particles in the CMNFO are transformed into soft magnetic Co phase, and Fe2O3 phase disappears after being reduced at 550 °C for 30 min. The magnetic measurement shows that specific saturation magnetization of the CMNFO decreases with the increase in Nd3+ content. By contrast, specific saturation magnetization and coercivity of CMNFO/Co composites obviously increase. Co0.6Mg0.15Nd0.04Fe2.21O4/Co composite exhibits a maximum specific saturation magnetization value (73.56 emu/g) at a reduction time of 20 min. Co0.6Mg0.15Nd0.04Fe2.21O4/Co composite still behaves a single-phase hysteresis loop, attributed to coherent magnetization rotation and strong exchange-coupling between hard magnetic CMNFO and soft magnetic Co particles.
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