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 |
|
Cite this article: |
WU Xue-Wei, NIU Dong-Lin, LIU Xiao-Jun 2006 Chin. Phys. Lett. 23 3072-3075 |
|
|
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)
|
|
|
|
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|