中文摘要：

对不同外磁场强度（B=0T，5T和10T）下退火的纳米BiFeO3颗粒进行了室温和液氮温度下的拉曼光谱研究。实验发现，与0T磁场下退火样品的Raman光谱相比，同一温度下，纳米BiFeO3颗粒中的Raman振动模式峰的线宽随着磁场的增加而减小，表明在外磁场的作用下，纳米BiFeO3颗粒内部的缺陷在减少，晶格完整性得到改善。经外磁场处理的纳米BiFeO3颗粒位于139cm^-1处的A一1模式峰明显向紫端移动，说明磁有序的程度可以影响到声子一自旋耦合。5T和10T磁场下退火的样品相比，该峰峰位没有明显改变，说明影响样品中磁有序排列的磁场存在一个临界值。三块样品的低温拉曼光谱证实了磁场的作用确实影响样品内磁有序的排列。

英文摘要：

Raman scattering study of BiFeO3 nanopariticles annealed by different magnetic field was carried out at room temperature and 77K. It is found that, comparing with Ra- man spectra of sample annealed directly, line widths of Raman vibration mode peaks decrease with extra magnetic field intensity increasing, indicating that inner detects reduce and lattice integrality improve in BiFeO3 nanopariticles affected by extra magnetic field, A- 1 mode peak around 139 cm-1 in BiFeOa nanopariticles annealed by extra magnetic field ob- viously shift to the higher frequency, showing that magnetic ordering may affect phononspin coupling. Comparing the samples annealed by 5T and 10T extra magnetic field, no distinct change is found, explaining that there is a critical magnetic value affecting a-rangement of magnetic ordering. Raman spectra of three samples at 77 K reconfirm that magnetic field actually affected arrangement of magnetic ordering.