[21p-P10-1~3] 9.5 New functional materials and new phenomena

[21p-P10-1] Heat Generation Characteristic of Fine Y₃Fe₅O₁₂ Powder in the AC Magnetic Field

〇(B)Reika Matsumoto¹, Kotomi Wakayama¹, Hideyuki Hirazawa¹, Shinya Matsutomo¹, Ayuka Tagashira¹, Masanori Sakamoto¹, Hiromichi Aono² (1.NIT, Niihama College, 2.Ehime Univ.)

Keywords:nanoparticle, YIG, AC magnetic field

The AC magnetic field cautery methods such as thermal coagulation techniques using magnetic material are attracting attention as a new treatment method for cancer tumors. In this treatment, a magnetic material that possesses a self-heating ability in an AC magnetic field is put in the cancerous tumor and generates heat over 42.5 ℃ to necrotize the cancerous tissue. To date, magnetite (Fe₃O₄) have been investigated as a candidate material for this therapy, but was found to have insufficient heat generation ability in an AC magnetic field. In our previous study, we found that the Y₃Fe₅O₁₂ has the highest heat generation ability among garnet-type structures. However, these Y₃Fe₅O₁₂ powder had large particle size that was caused by calcinations over 1100℃ in order to obtain a single phase of Y₃Fe₅O₁₂ structure. In this study, we attempted to synthesize in fine Y₃Fe₅O₁₂ powder by a modified coprecipitation method and solvothermal synthesis in order to clarify the mechanism of heat generation characteristic in an AC magnetic field .