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Study Of Weak Ferromagnetism In Polycrystalline Multiferroic Eu Doped Bismuth Ferrite

机译:多晶Eu铁掺杂铋铁氧体中弱铁磁性的研究

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Room temperature spontaneous magnetization and dielectric anomaly at Neel temperature are observed in 15% Eu doped bismuth ferrite indicating the multiferroic nature of the sample. With 15% Eu doping structural transformation from rhombohedral to triclinic is observed. Fe~(3+) and Eu~(3+) oxidation states are observed from ~(57)Fe and ~(151)Eu Mossbauer measurements, respectively. The high field ~(57)Fe Mossbauer spectrum in longitudinal geometry shows an enhancement in the intensity of lines corresponding to △m-0 transitions, i.e., second and fifth lines in six line pattern. This observation suggests that the origin of spontaneous magnetization is due to weak ferromagnetism of Dzyaloshinskii-Moriya type.
机译:在掺有15%Eu的铋铁氧体中观察到室温下Neel温度下的室温自发磁化和介电异常,表明样品具有多铁性。用15%的Eu掺杂,可以观察到从菱形到三斜晶的结构转变。从〜(57)Fe和〜(151)Eu Mossbauer测量分别观察到Fe〜(3+)和Eu〜(3+)氧化态。纵向几何形状的高场〜(57)Fe Mossbauer光谱显示出对应于△m-0跃迁的线(即,六线模式的第二和第五条线)的强度有所增强。该观察结果表明,自发磁化的起源是由于Dzyaloshinskii-Moriya类型的弱铁磁性。

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