Ultrafast photoinduced magnetic moment in a charge-orbital-ordered antiferromagnetic Nd 0.5 Sr 0.5 MnO 3 thin film
Ultrafast photoinduced magnetic moment in a charge-orbital-ordered antiferromagnetic Nd 0.5 Sr 0.5 MnO 3 thin film
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DOI：
10.1103/physrevb.74.012401
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发表时间：
2006-07
影响因子：
3.7
通讯作者：
K. Miyasaka;M. Nakamura;Y. Ogimoto;H. Tamaru;K. Miyano
中科院分区：
文献类型：
--
作者：
K. Miyasaka;M. Nakamura;Y. Ogimoto;H. Tamaru;K. Miyano
通过亚皮秒光学泵浦和反铁磁锰矿中的探针测量，研究了电荷扇区中的光激发对磁化强度的影响。磁光克尔测量显示磁矩呈阶梯式增加，然后逐渐增长。阶梯状行为归因于激发态下的自旋翻转散射，而较慢的过程归因于自旋晶格热化，其表现出向反铁磁-铁磁转变温度的减慢。与铁磁锰氧化物的光致退磁时间相比，这些过程的时间尺度要快得多，并且反映了潜在的自旋电荷轨道顺序的影响。
The effect of photoexcitation in the charge sector on the magnetization has been studied with subpicosecond optical pump-and-probe measurements in an antiferromagnetic manganite. Magneto-optic Kerr measurements show a steplike increase of magnetic moment followed by a gradual growth. The steplike behavior is ascribed to the spin flip scattering in the excited states while the slower process to the spin-lattice thermalization, which exhibits slowing down toward the antiferromagnetic-ferromagnetic transition temperature. The time scale of these processes is much faster compared to the photoinduced demagnetization time of ferromagnetic manganites and reflects the effect of underlying spin-charge-orbital order.