Photo-induced magnetic phase transition in spin crossover complexes

研究了自旋交叉材料中低自旋态和高自旋态之间的光刻蚀过程，如自旋交叉络合物和半磁半导体。主要结果如下：(1)自旋交叉络合物中的光致磁相变通过测量吸收光谱和磁化率，研究了Fe^&lt；2&gt；自旋交叉络合物中的光致磁相变。在低自旋态和高自旋态之间的光摆动过程中，观察到了类阈值行为、潜伏期和相分离等非线性特性。这些结果表明，由自旋-晶格相互作用介导的协同系间交叉在一类新的非平衡现象的驱动过程中起着关键作用。观察到磁极化子的塞曼位移和结合能减小。用锰自旋的加热效应解释了这种光谱特征。首次观察到了自旋加热的偏振依赖性，揭示了激子和磁性离子之间的自旋反转对加热过程的贡献。

Photowithching process between low- and high-spin states in is investigated in spin crossover materials, such as spin crossover complexes and semimagnetic semiconductors. The outline of the achieved results is shown as follows.(1) Photo-induced magnetic phase transition in spin crossover complexesDetails of the photo-induced magnetic phase transition in Fe^<2+> spin crossover complexes were investigated by measuring absorption spectrum and magnetic susceptibility. In the photoswithing process between low- and high-spin states, nonlinear characteristics such as thresholdlike behavior, incubation period, and phase separation have been observed. These results demonstrate that the cooperative intersystem crossing mediated by spin-lattice interaction plays a key role in driving process of a new class of nonequilibrium phenomena. In addition, it turned out that this photo-induced magnetic phase transition process was greatly influenced by an external magnetic field.(2) Photo-induced magnetic phase transition in semimagnetic semiconductorsTime-resolved Magneto-photoluminescence experiments were carried out in a semimagnetic semiconductor Cd _<0.9>Mn_<0.1>Te with varing exciton density. A reduction of the Zeeman shift and the binding energy of magnetic polaron is observed. The spectral feature is interpreted by the heating effect of manganese spins. Polarization dependence of the spin heating is observed for the first time, revealing the contribution of spin flip between excitons and magnetic ions to the heating process.