The 66th JSAP Spring Meeting, 2019

Presentation information

Oral presentation

10 Spintronics and Magnetics » 10.4 Semiconductor spintronics, superconductor, multiferroics

[12p-M101-1~14] 10.4 Semiconductor spintronics, superconductor, multiferroics

Tue. Mar 12, 2019 1:00 PM - 5:00 PM M101 (H101)

Yota Takamura(Tokyo Tech), DUC ANh LE(Univ. Tokyo)

3:15 PM - 3:30 PM

[12p-M101-9] Electronic structure of p-type ferromagnetic semiconductor (Ga,Fe)Sb: Valence band and impurity band

Takahito Takeda1, Masahiro Suzuki2, Le Duc Anh1,3, Yosuke Nonaka2, Thorsten Schmitt4, Satoshi Yoshida5, Masato Sakano5, Kyoko Ishizaka5, Yukiharu Takeda6, Shin-ichi Fujimori6, Munetoshi Seki1,3, Hitoshi Tabata1,3, Atsushi Fujimori2, Masaaki Tanaka1,3, Vladimir N. Strocov4, Masaki Kobayashi1,3 (1.Grad. Sch. Eng., Univ. of Tokyo, 2.Dep. Phys., Univ. of Tokyo, 3.CSRN, Univ. of Tokyo, 4.Swiss Light Source, 5.QPEC, Grad. Sch. Eng., Univ. of Tokyo, 6.JAEA/SPring-8)

Keywords:Ferromagnetic semiconductor, Angle-resolved photoemission spectroscopy

Ferromagnetic semiconductors (FMSs) are alloy semiconductors in which cations are partially replaced by magnetic impurities. FMSs have both the properties of ferromagnets and semiconductors and exhibit carrier-induced ferromagnetism, thereby attracting much attention as promising materials for semiconductor spintronics devices because one can control their magnetic properties by changing the carrier concentration. However, the Curie temperature (TC) of III-V based FMSs was much lower than room temperature (RT) despite tremendous efforts for the past two decades. Recently, Tu et al., have successfully grown p-type (Ga,Fe)Sb whose TC is higher than RT. Magnetic circular dichroism (MCD), magnetotransport, and magnetization measurements indicate that (Ga,Fe)Sb is an intrinsic ferromagnetic semiconductor . In this study, we conducted soft x-ray angle-resolved photoemission spectroscopy (SX-ARPES) measurements on (Ga1-x,Fex)Sb with x = 0.05 and GaSb thin films to reveal the band structure and to unveil the origin for the high-TC ferromagnetism above RT.