Exploring Origin of Ferromagnetism from Abnormal Exchange Bias in Mn-Doped BiFeO 3 Nanoparticles
Exploring Origin of Ferromagnetism from Abnormal Exchange Bias in Mn-Doped BiFeO 3 Nanoparticles
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DOI：
10.1166/sam.2014.1965
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发表时间：
2014-09
影响因子：
0.9
通讯作者：
L. Wu;Jy Li;C. Dong;C. Jiang;D. Xue
中科院分区：
文献类型：
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作者：
L. Wu;Jy Li;C. Dong;C. Jiang;D. Xue
采用共沉淀法合成了BiFe_（1-x）Mn_xO_3（x = 0，0.10，0.15，0.20）单晶。饱和磁化强度M-s从x = 0时的0.05emu/g增加到x = 0.20时的0.5emu/g，表明铁磁性随x的增加而增强。在同一场冷却过程中，观察到交换偏置场随x变化的反常现象，在x = 0.10时，交换偏置场最大，达到2000 Oe。由于Mn离子占据了Fe离子的位置，使得体系的净磁矩增加，反铁磁交换积分J（AFM）减小，最终在x = 0.10处出现最大交换偏置场.
Monocrystalline BiFe1-xMnxO3 (x = 0, 0.10, 0.15, 0.20) were synthesized by co-precipitation method. Saturation magnetization M-s increased from 0.05 emu/g at x = 0 to 0.5 emu/g at x = 0.20, which indicated the enhancement of ferromagnetism with the increase of x. Abnormal exchange bias field changing with different x in same field cooling process was observed, in which maximum value 2000 Oe was obtained at x = 0.10. Since Mn ions occupied the position of Fe ions, the increase of net magnetic moments and the decrease of antiferromagnetic exchange integrals J(AFM) were obtained, which eventually led to maximum exchange bias field at x = 0.10.