Abstract
A new strategy to enhance the magnetostriction parameters of cobalt ferrite (CoFe2O4) is illustrated. A composite comprising of nanocrystalline CoFe2O4 and bulk CoFe1.9Ga0.1O4 powders were mixed together then compacted and sintered at 1450 °C for 10 min. For a composite of 70 wt% CoFe2O4 and 30 wt% of CoFe1.9Ga0.1O4, maximum magnetostriction coefficient (λmax) of −350 ppm has been obtained at lower magnetic field which is nearly 20% and 65% higher than that obtained for CoFe2O4 and CoFe1.9Ga0.1O4, respectively. Moreover, the composite exhibited higher strain sensitivity [dλ/dH]max of −2.6 × 10−9 A−1 m against the individual components of the composite.
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