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Electronic noise of diluted magnetic semiconductor (Ga,Mn)As around Curie point

Ji Yang Zhao Jian-Hua Yang Wei Luo Hai-Hui Ruan Xue-Zhong Wang Wei-Zhu

Electronic noise of diluted magnetic semiconductor (Ga,Mn)As around Curie point

Ji Yang, Zhao Jian-Hua, Yang Wei, Luo Hai-Hui, Ruan Xue-Zhong, Wang Wei-Zhu
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  • Received Date:  08 March 2009
  • Accepted Date:  28 April 2009
  • Published Online:  20 December 2009

Electronic noise of diluted magnetic semiconductor (Ga,Mn)As around Curie point

  • 1. (1)中国科学院半导体研究所,北京 100083; (2)中国科学院半导体研究所,北京 100083;中国科学院研究生院,北京 100049

Abstract: We have studied the spontaneous fluctuation noise spectrum of (Ga,Mn)As in frequency domian from 1 kHz to 250 kHz. We found that the electronic noise can be reduced by a magnetic field and its magnitude increases with increasing temperature of the (Ga,Mn)As sample. The electrical noise spectra at different frequencies have different temperature dependence and their amplitude changes at the phase transition temperature, suggesting that the phase transition process of (Ga,Mn)As is subtly different from normal magnetic materials. Our results may help understanding the origin of magnetism in (Ga,Mn)As.

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