[20p-E201-1~11] 21.1 Joint Session K "Wide bandgap oxide semiconductor materials and devices"

▲ [20p-E201-11] Crystal structure transformation of Fe₃O₄ from spinel type to rock salt type via ion irradiation

〇Yang Liu¹, Yuki Hisamatsu¹, Isao Harayama¹, Sonia Sharmin¹, Daiichiro Sekiba¹, Daiki Oshima⁴, Takeshi Kato³, Satoshi Iwata⁴, Eiji Kita², Hideto Yanagihara¹ (1.Tsukuba Univ., 2.Ibaraki Colg., 3.Nagoya Univ., 4.Nagoya IMaSS)

Keywords:Thin film, Ion irradiation, Structure transformation

An interesting topic of recent study is how spinel materials, such as MgAl₂O₄, MgGa₂O₄ and MgIn₂O₄¹, are affected by ion implantation, a technique which can change a material’s fundamental properties. However, hardly any investigation has been carried out on irradiated spinel ferrite materials. In the previous study, we investigated the effect of Kr ion implantation on the epitaxial CoFe₂O₄ thin films, and found that the magnetization decreased due to ion irradiation causing a structural transformation from spinel to rock salt type. However, the mechanism of topotactic reaction in epitaxial films was not well explained. In this study, we focus on prototype spinel Fe₃O₄ thin films and investigate the structural transformation from spinel to rock salt via Kr ion implantation.