In order to improve the quality in some types of cancer treatment, such as the cases where surgery is not the best option for immediate action, new materials have been developed in recent years. In this way, composites based on bioactive glass-matrix can promote the interaction of the material with the organism in order to stimulate several new types of treatments. Recently, the development of bioglass-ceramics with good bioactivity containing magnetic properties has received much attention as a thermos-seed in hyperthermia treatment of cancer, especially deep-seated bone tumors. Since bioactive ferrimagnetic glass-ceramics possesses both bioactivity and magnetic properties having good prospect in hyperthermia, the physical properties of such materials have to be carefully investigated. The objective of the present work is to synthesize and to study the structural properties of bioactive ferrimagnetic glass-ceramics composites viewing their integration in biomedical applications. The material under study consist of a glassy system with the chemical formula $(94-2x){\mathrm{SiO}}_2-x{\mathrm{Na}}_2\mathrm{O}-x\mathrm{CaO}-6{\mathrm{P}}_2{\mathrm{O}}_5$, which acts as host-matrix for the magnetic phase (strontium ferrite). The samples were obtained by a modified incorporation method, where the magnetic phase, previously prepared by mixing oxides, is added to the glass-matrix in desired proportions. The physical properties were investigated considering the analysis of the X-ray diffraction patterns, as well as Raman spectroscopy, performed at room temperature. Results revealed the formation of partially crystallized bioglass-ceramics, with a strong influence of the magnetic phase on the crystallization kinetics, which suggests the obtained bioactive composites promising materials for clinical treatments.

$\mathbf{ACKNOWLEDGMENTS}\mathbf{:}$ The authors would like to thank to FAPEMIG and CNPq Brazilian agencies for financial support.