Ultra-high coercivity and terahertz ferromagnetic resonance in single-domain hexaferrite nano-ceramics

Record values of natural ferromagnetic resonance frequency up to 250 GHz and of coercive force up to 36 kOe were obtained in Ca-Al substituted strontium hexaferrite nano-ceramics. Variation of annealing time was shown to affect the magnetic properties and particle size of the ceramic materials.