Open AccessElectronic noise of diluted magnetic semiconductor (Ga,Mn)As around Curie point
Author(s) -
Wei Yang,
Jinming Yang,
Luo Hai-Hui,
Ruan Xue-Zhong,
Wang Weizhu,
Jianhua Zhao
Publication year - 2009
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.58.8560
Subject(s) - condensed matter physics , curie temperature , materials science , magnetic semiconductor , noise (video) , magnetism , amplitude , phase transition , phase (matter) , semiconductor , nuclear magnetic resonance , physics , ferromagnetism , optoelectronics , optics , quantum mechanics , artificial intelligence , computer science , image (mathematics)
We have studied the spontaneous fluctuation noise spectrum of Ga,MnAs 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,MnAs 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,MnAs is subtly different from normal magnetic materials. Our results may help understanding the origin of magnetism in Ga,MnAs.