“…Among these parameters, H c is considered as a key parameter characteristic of the magnetic hardness of cobalt ferrite, which is ascribed to the occupation of Co 2+ because it is ascribed to be a highly anisotropic ion. 25,26 In practice, it can be tuned H c via fabricating core/shell nanomaterials, 27 nanocomposites, 17,28 and nanostructures (nanoparticles, nanowires, nanobers, nanoribbons, and thin lms). 21,23,24,29,30 It is clear that an enhancement in H c can be realized upon changing the crystal shape and particle size, and/ or creating a high level of residual lattice strain and distortions inside particles.…”