[15a-501-1~10] 10.4 半導体スピントロニクス・超伝導・強相関

▼ [15a-501-2] High-temperature ferromagnetism in a new n-type Fe-doped ferromagnetic semiconductor (In,Fe)Sb

〇Nguyen Tu Thanh¹、Pham Nam Hai^1,2、Le Duc Anh¹、Tanaka Masaaki¹ (1.Tokyo Univ.、2.Tokyo Tech. Inst.)

キーワード：Ferromagnetic semiconductors, high Curie temperature, semiconductor spintronics

We show high-temperature ferromagnetism in new n-type Fe-doped ferromagnetic semiconductor (In_1-x,Fe_x)Sb (x = 5-16%) thin films grown by low-temperature molecular beam epitaxy. Crystal structure analyses by X-ray diffraction, scanning transmission microscopy and transmission electron diffraction indicate that the (In_1-x,Fe_x)Sb thin films maintain the zinc-blende crystal structure up to x = 16%. Magnetic circular dichroism spectroscopy and anomalous Hall effect measurements indicate intrinsic ferromagnetism in (In,Fe)Sb thin films. The Curie temperature of reaches 350 K for x = 16%, which is the highest values reported so far in intrinsic III-V ferromagnetic semiconductors.