Photoinduced Spin Disorder in Half-Metal CrO 2 films
Photoinduced Spin Disorder in Half-Metal CrO 2 films
复制标题
半金属CrO 2 薄膜中的光致自旋紊乱
DOI：
10.1088/0256-307x/23/11/052
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发表时间：
2006
影响因子：
3.5
通讯作者：
L. Xiaojun
中科院分区：
文献类型：
--
作者：
Wu Xue;Niu Dong;L. Xiaojun
利用时间分辨泵浦探测方法，研究了在300K到470K温度范围内，导电电子完全极化的半金属铁磁CrO2(TC~390K)的自旋态的光诱导效应，发现在1.55 eV的光激励下透射谱的ΔT/T有显著的负变化。Δ的T/T值在从低温侧接近TC时单调减小，表明存在光致自旋无序状态。此外，我们用局域自旋密度近似加U(LSDA+U)方法计算了CrO2在基态和光激发态的饱和磁化强度MS，发现光激发态的饱和磁化强度MS值有所下降。光激发态被抑制的MS值与实验数据一致。
We investigate the photoinduced effects on the spin state for half-metallic ferromagnet CrO2 (TC~390 K), in which the conducting electrons are totally polarized, by means of the time-resolved pump–probe method at the temperature range from 300 K to 470 K. A significant negative change ΔT/T for the transmittance spectrum at 1.55 eV 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.
自旋交叉复合体中的光学滞后
DOI：
--
发表时间：
2003
期刊：
Phys. Rev. B 67
影响因子：
--
作者：
X.;J.;Liu;et. al.
通讯作者：
et. al.