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Photoinduced Spin Disorder in Half-Metal CrO2 films |
| WU Xue-Wei;NIU Dong-Lin;LIU Xiao-Jun |
| Key Laboratory of Modern Acoustics, Department of Electronic Science and Engineering, Nanjing University, Nanjing 210093 |
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| Cite this article: |
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WU Xue-Wei, NIU Dong-Lin, LIU Xiao-Jun 2006 Chin. Phys. Lett. 23 3072-3075 |
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Abstract We investigate the photoinduced effects on the spin state for half-metallic ferromagnet CrO2 (TC～390K), in which the conducting electrons are totally polarized, by means of the time-resolved pump--probe method at the temperature range from 300K to 470K. A significant negative change ΔT/T for the transmittance spectrum at 1.55eV under photo-excitation is found. The ΔT/T value monotonically decreases on approaching to TC from the low temperature side, suggesting a photoinduced spin disorder state. Furthermore, we calculate the saturation magnetization MS of CrO2 in both the ground and photo-excited states by using the local-spin-density approximation plus U (LSDA+U) method, and find a decrease of the MS-value in the photo-excited state. The suppressed MS-value in the photo-excited state is consistent with the experimental data.
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| Keywords:
74.62.Dh
71.30.+h
72.80.Ga
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Published: 01 November 2006
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| PACS: |
74.62.Dh
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(Effects of crystal defects, doping and substitution)
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71.30.+h
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(Metal-insulator transitions and other electronic transitions)
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72.80.Ga
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(Transition-metal compounds)
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