A characteristic feature of most magnetic materials is that they have a hysteresis cycle. The energy of an alternating magnetic field, supplied to the nanoparticles during repeated passage of the hysteresis cycle by the magnetic field, is converted into heat in the environment. This is the usual mechanism of heating a malignant tumor in hyperthermia. In this paper, we consider the possibility of heating a part of the body under the resonant action of a radio-frequency field, where the resonant frequency is due to the flow of root-mean-square fluctuations of angular variables (rotational diffusion) that is cyclic motion. This method of heating the tumor area is different from those commonly used in magnetic hyperthermia. It is shown that by a selection of the parameters of the resonant field, it is possible to achieve an increase in tumor temperature by 6 degrees (sufficient for the destruction of malignant cells) in 27 minutes.