The mapping of ferrimagnetic ceramics has been determined by developing a tool that shows the magnitude and magnetic changes in ferrimagnetic ceramics. Cobalt ferrite (CoFe2O4) was used to develop and fabricate the ferrimagnetic ceramic. The ferrimagnetic ceramic was processed using oxide mixing, uniaxial pressing, and sintering techniques. Once the ferrimagnetic ceramic was magnetized, its magnetic field was characterized, mapping in X-Y with steps of 1 mm in a length of 20 mm for X and Y, which originated on the ferrimagnetic ceramic. Subsequently, the Curie temperature (782 K) was obtained. In addition, the magnetic change of the ceramic was plotted versus temperature, showing the results of the top view, two-dimensionally and in 3D. This led to examining the behavior of the bound magnetic field as a temperature sensor through the design and development of a sensor in which the magnetic field of the ferrimagnetic ceramic varies with temperature, which was measured with a Hall effect device from room temperature up to 673 K and compared with a thermocouple reaching 268 k. In this area, the hot ferrimagnetic ceramic (CoFe2O4), with the monitoring of its magnetic field related to its temperature, has great possibilities to be used in biomedical engineering, i.e., in dermatology as a surgical treatment with controlled heat on the skin to remove warts, acne, skin cancer, or even cauterize tissues, in Laparoscopy, that is surgical without having to make large incisions in the skin, known as minimally invasive surgery.