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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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| Cite this article: |
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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.
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| Keywords:
75.47.Lx
75.90.+w
75.47.-m
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Published: 01 October 2005
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| PACS: |
75.47.Lx
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(Magnetic oxides)
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75.90.+w
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(Other topics in magnetic properties and materials)
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75.47.-m
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(Magnetotransport phenomena; materials for magnetotransport)
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