Investigation of relationship between magnetic field intensity and heat generation rates of a small magnetic sphere

Abstract

This paper shows heat generation rates of a 1-mm-diameter magnetic sphere at different positions in a magnetic field. To determine the heat generation rates, temperature distributions of water around the sphere were measured by the near-infrared absorbance imaging method based on the temperature dependence of absorbance of water at the wavelength of 1150 nm. A two-dimensional map of the heat generation rates, corresponding to the distribution of magnetic field intensity, was constructed. These values of heat generation rates agreed with theoretically estimated values.