We prepared very high-coercivity cobalt ferrite nanoparticles synthesized by a combustion
method and using short-time high-energy mechanical milling to increase strain and the
structural defects density. The coercivity (HC) of the milled sample reached 3.75 kOe—a
value almost five times higher than that obtained for the non-milled material (0.76 kOe). To
investigate the effect of the temperature on the magnetic behavior of the milled sample, we
performed a thermal treatment on the milled sample at 300, 400, and 600 C for 30 and 180 …