Persistent photoinduced magnetization and hole droplets in La0.9Ca0.1MnO3 films -: art. no. 132404

被引：15

作者：

Huhtinen, H ^{[1
]}

Laiho, R ^{[1
]}

Zakhvalinskii, V ^{[1
]}

机构：

[1] Univ Turku, Dept Phys, Wihuri Phys Lab, FI-20014 Turku, Finland

来源：

PHYSICAL REVIEW B | 2005年 / 71卷 / 13期

关键词：

D O I：

10.1103/PhysRevB.71.132404

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Photoinduced magnetization following a stretched exponential growth with time is observed in La0.9Ca0.1MnO3 films exposed to near infrared light in magnetic fields of B >= 0.1 mT. The magnetic irreversibility observed below 56 K between zero-field-cooled and field-cooled films is strongly influenced by illumination, giving space to a persistent magnetic state with increased ferromagnetic interactions, modified magnetic anisotropy and decrease of the blocking temperature to 5 K. When the illumination and the magnetic field are removed the magnetization of the films decays very slowly after a short period of fast relaxation but recovers the original level when the field is applied again. Such behavior obeys predictions for domain pinning in narrow-wall random-field Ising systems. The results suggest trapping of photogenerated electrons by magnetic disorder while the holes contribute to growth of ferromagnetism in the films.

引用

页数：4

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