講演情報
[8p-E207-2]Effects of growth temperature on the magnetic properties of (Ga,Fe)Sb
〇(M1)Trang ThiHuyen Bui1, Masaaki Tanaka1,2,3, Anh Duc Le1,3 (1.Dept. of EEIS, The Univ. of Tokyo, 2.CSRN, The Univ. of Tokyo, 3.INQIE, The Univ. of Tokyo)
キーワード：
Ferromagnetic semiconductor、Molecular beam epitaxy、Growth temperature
Ferromagnetic semiconductors (FMSs) are promising materials for spintronic applications because they combine semiconducting and ferromagnetic functionalities. Among them, (Ga,Fe)Sb exhibits a high Curie temperature (TC > 300 K), and its magnetic properties strongly depend on the Fe distribution. In this work, (Ga,Fe)Sb thin films with a constant Fe concentration of 15% were grown by low-temperature molecular beam epitaxy at growth temperatures TS = 220–350°C. X-ray diffraction measurements show that the lattice constant increases with TS and saturates above 320°C. Correspondingly, the coercive field increases with TS and reaches ~0.17 T at TS = 300°C, about 11 times higher than that at 220°C. The TC exceeds 320 K for samples grown above 280°C, while the blocking temperature shifts to higher values with increasing TS. A clear anomalous Hall effect is observed for TS = 220–300°C but disappears above 300°C, suggesting possible phase separation. The film grown at 300°C exhibits the most favorable magnetic properties among all samples. These results demonstrate the strong influence of growth temperature on the structural and magnetic properties of (Ga,Fe)Sb.