[18p-E311-1~18] 6.3 Oxide electronics

△ [18p-E311-7] New high-T_C ferromagnetic semiconductor: rare-earth monoxide GdO

〇(M2)Taku Yamamoto¹, Kenichi Kaminaga², Daichi Saito¹, Daichi Oka¹, Tomoteru Fukumura^1,2,3 (1.Tohoku Univ., 2.WPI-AIMR & Core Research Cluster, Tohoku Univ., 3.CSIS CSRN, Tohoku Univ.)

Keywords:ferromagntism, semiconductor, epitaxial

Ferromagnetic semiconductors capable of electrically controlling magnetism are one of the important spintronics materials. However, none of the materials satisfied both high Curie temperature (T_C) and strong spontaneous magnetization. We firstly succeeded in epitaxial synthesis of GdO thin films with anomalous divalent Gd ion, and discovered tha it is a new ferromagnetic semiconductor that satisfies both high T_C (279 K) and strong spontaneous magnetization. GdO is an n-type semiconductor, and its spontaneous magnetization and T_C depend on its carrier concentration.