Open AccessObservation of current-induced polarization in (Ga,Mn)As via magneto-optic Kerr measurement
Author(s) -
Xue Gu,
Xuan Qian,
Jing Yang,
Changjian Lin,
Jianhua Zhao
Publication year - 2012
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.61.037801
Subject(s) - magneto optic kerr effect , kerr effect , polarization (electrochemistry) , condensed matter physics , wavelength , linear polarization , spectral line , optics , physics , magnetic field , absorption edge , materials science , band gap , laser , chemistry , quantum mechanics , nonlinear system , astronomy
Current-induced Kerr rotation spectra and reflectivity spectra of (Ga,Mn)As and p-GaAs were measured in the absence of the magnetic field via magneto-optic Kerr effect around the energy gap. The dependence of the Kerr rotation and the reflectivity on the laser wavelength show Lorentzian profile. The Kerr rotation depends linearly on the current and the reflectivity depends linearly on the square of the current. The Kerr rotation of P-GaAs is much weaker than that of the (Ga,Mn)As which indicate that the doping of Mn enhance the current-induced spin polarization . The dependence of the Kerr rotation and the reflectivity on the temperature was also measured, both showing red shift of their Lorentzian peaks, a familiar behavior as the absorption edge of GaAs. In addition, we observed the dependence of the Kerr signal on the polarizational direction of the incident beam.