Abstract
The fine magnetic materials having a high heat generation ability in an AC magnetic field have been studied for use in new thermal coagulation therapy. The fine ferrite powder about La3+ added MgFe2O4 was prepared by beads milling. The highest heat generation properties of the La3+ added MgFe2O4 was obtained at milled for 240min using 0.1 mmφbeads. The maximum heat generation ability and hysteresis loss value were obtained for ca. 8.6nm in crystal size. A physical milling method using bead milling was very effective for preparing the nano-sized La3+ added MgFe2O4 powder.
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