Ultrafast control of magnetization by photocarrier injection in La 0.9 Sr 0.1 MnO 3 /SrTiO 3 heterostructures
Ultrafast control of magnetization by photocarrier injection in La 0.9 Sr 0.1 MnO 3 /SrTiO 3 heterostructures
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DOI：
10.1103/physrevb.83.165408
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发表时间：
2011-04
影响因子：
3.7
通讯作者：
H. Yada;M. Matsubara;Hiroyuki Yamada;A. Sawa;H. Matsuzaki;H. Okamoto
中科院分区：
文献类型：
--
作者：
H. Yada;M. Matsubara;Hiroyuki Yamada;A. Sawa;H. Matsuzaki;H. Okamoto
利用时间分辨磁光克尔效应研究了由钙钛矿锰氧化物La${}_{0.9}$Sr${}_{0.1}$MnO${}_{3}$和钛酸盐SrTiO${}_{3}$（STO）组成的氧化物异质结构的光控制磁化。在STO的光激发下，锰氧化物的磁化强度在0.2 ps内增加，并持续500 ps。这种超快的磁化归因于快速的空穴注入到锰氧化物由于强带弯曲的STO附近的接口，而磁化的长寿命是由于电子注入到锰氧化物层的延迟。详细讨论了界面上的光生载流子动力学。
We investigated photocontrol of magnetization in oxide heterostructures consisting of a perovskite manganite La${}_{0.9}$Sr${}_{0.1}$MnO${}_{3}$ and a titanate SrTiO${}_{3}$ (STO) by time-resolved magneto-optical Kerr effect measurements. On photoexcitation of STO, the magnetization of the manganite increases within 0.2 ps and persists for \ensuremath{\sim}500 ps. This ultrafast magnetization is ascribed to rapid hole injection from STO into the manganite due to strong band bending of STO near the interface, while the long lifetime of the magnetization is attributed to a delay in electron injection to the manganite layer. The photocarrier dynamics across the interface is discussed in detail.