Chin. Phys. Lett.  2005, Vol. 22 Issue (10): 2666-2669    DOI:
Original Articles |
Modulation of Electric Current on Photoinduced Spin-Disorder in a Manganite Film
LIU Xiao-Jun
State Key Laboratory of Modern Acoustics, Nanjing University, Nanjing 210093
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LIU Xiao-Jun 2005 Chin. Phys. Lett. 22 2666-2669
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Abstract We investigate the photoinduced resistance change (Δ R/R) in a La0.6Sr0.4MnO3 film (Tc\sim 325K) at different applied dc currents I (0.1--2.0mA) at 295K. At I = 0.1mA, we have found a significant photoinduced ΔR/R~17% under photo-irradiation at excitation energy Eexc = 3.05eV and pump power Ppump = 2.5mJ/cm2, which has been ascribed to the photo-excited down-spin eg carriers and hence the spin-disorder in the ferromagnetic metallic state. With increasing applied electric current to 2.0mA, the magnitude of the photoinduced ΔR/R is reduced to 3%, which may be attributed to current-induced ordering of the localized spins.
Keywords: 75.47.Lx      75.90.+w      75.47.-m     
Published: 01 October 2005
PACS:  75.47.Lx (Magnetic oxides)  
  75.90.+w (Other topics in magnetic properties and materials)  
  75.47.-m (Magnetotransport phenomena; materials for magnetotransport)  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2005/V22/I10/02666
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