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Chin. Phys. B, 2018, Vol. 27(6): 067204    DOI: 10.1088/1674-1056/27/6/067204
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Room-temperature large photoinduced magnetoresistance in semi-insulating gallium arsenide-based device

Xiong He(何雄), Zhi-Gang Sun(孙志刚)
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
Abstract  It is still a great challenge for semiconductor based-devices to obtain a large magnetoresistance (MR) effect under a low magnetic field at room temperature. In this paper, the photoinduced MR effects under different intensities of illumination at room temperature are investigated in a semi-insulating gallium arsenide (SI-GaAs)-based Ag/SI-GaAs/Ag device. The device is subjected to the irradiation of light which is supplied by light-emitting diode (LED) lamp beads with a wavelength in a range of about 395 nm-405 nm and the working power of each LED lamp bead is about 33 mW. The photoinduced MR shows no saturation under magnetic fields (B) up to 1 T and the MR sensitivity S (S=MR/B) at low magnetic field (B=0.001 T) can reach 15 T-1. It is found that the recombination of photoinduced electron and hole results in a positive photoinduced MR effect. This work implies that a high photoinduced S under a low magnetic field may be obtained in a non-magnetic semiconductor device with a very low intrinsic carrier concentration.
Keywords:  GaAs      magnetoresistance      carrier recombination  
Received:  10 November 2017      Revised:  02 February 2018      Accepted manuscript online: 
PACS:  72.80.Ey (III-V and II-VI semiconductors)  
  75.47.-m (Magnetotransport phenomena; materials for magnetotransport)  
  72.20.Jv (Charge carriers: generation, recombination, lifetime, and trapping)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos.11574243 and 11174231).
Corresponding Authors:  Zhi-Gang Sun     E-mail:  sun_zg@whut.edu.cn

Cite this article: 

Xiong He(何雄), Zhi-Gang Sun(孙志刚) Room-temperature large photoinduced magnetoresistance in semi-insulating gallium arsenide-based device 2018 Chin. Phys. B 27 067204

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