Chin. Phys. Lett.  2006, Vol. 23 Issue (11): 3072-3075    DOI:
Original Articles |
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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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.
Keywords: 74.62.Dh      71.30.+h      72.80.Ga     
Published: 01 November 2006
PACS:  74.62.Dh (Effects of crystal defects, doping and substitution)  
  71.30.+h (Metal-insulator transitions and other electronic transitions)  
  72.80.Ga (Transition-metal compounds)  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2006/V23/I11/03072
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