The heat generation material in the AC magnetic field for nano-sized Mg_(1-x)Cu_xFe_2O_4 prepared by beads milling

摘要

Magnetic materials having potential high heat generation ability in an AC magnetic field were investigated for new thermal coagulation therapy. In our previous study, the MgFe_2O_4 shows the highest heat generation in various commercial ferrites. Moreover, we found that the heating ability in an AC magnetic field was improved by Cu~(2+) ion substitution to the MgFe_2O_4. Reason for this high heat generation was increasing the hysteresis loss due to the phase separation ca. cubic MgFe_2O_4 and tetragonal CuFe_2O_4 from cubic single phase, and then the crystal distortion was caused by Cu~(2+) substitution. In this study, we prepared the Mg_(0.4)Cu_(0.6)Fe_2O_4 ferrite having highest heating ability in series of Mg_(1-x)Cu_xFe_2O_4 where X=0-1.0 by solid reaction method, and beads milled in order to discuss the effect of particle size for hysteresis loss.