Exchange bias associated with phase separation in the perovskite cobaltite La1-xSrxCoO3

被引：176

作者：

Tang, Yan-kun

Sun, Young ^{[1
]}

Cheng, Zhao-hua

机构：

[1] Chinese Acad Sci, Inst Phys, State Key Lab Magnetism, Beijing 100080, Peoples R China

[2] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100080, Peoples R China

来源：

PHYSICAL REVIEW B | 2006年 / 73卷 / 17期

关键词：

D O I：

10.1103/PhysRevB.73.174419

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report the observation of exchange bias phenomena in the hole-doped perovskite cobaltites La1-xSrxCoO3 (x=0.12, 0.15, 0.18, and 0.30) in which a spontaneous phase separation occurs. When the La1-xSrxCoO3 samples are cooled in a static magnetic field through a freezing temperature, the magnetization hysteresis loops exhibit both horizontal and vertical shifts. We also observed training effect of the exchange bias, which can be interpreted by a spin configurational relaxation model. Moreover, exchange bias in La1-xSrxCoO3 is strongly dependent on the measuring field and the cooling field due to the influence of magnetic field on the relative proportion of the coexisting phases. These results suggest that the intrinsic phase inhomogeneity in a spontaneously phase-separated system may induce an interfacial exchange anisotropy.

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页数：6

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