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Unequivocal evidence of enhanced magnetodielectric coupling in Gd3+ substituted multiferroic Bi2Fe4O9

机译：Gd3 +取代的多二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二二铁

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摘要

We report an enhanced magnetodielectric (MD) coupling in antiferromagnetic Bi2Fe4O9 (BFO) lightly substituted by gadolinium (Gd3+). Rietveld refined X-ray diffraction and Raman spectra reveal the formation of orthorhombic phase for all the synthesized samples. Gd3+ substitution results in a notable increase of antiferromagnetic transition (T-N) from 250 K (x = 0, BFO) to 256 K (x = 0.02, BGFO2). At the same time, deviation from linear M-H behaviour in the substituted samples at T <= 30 K implies the onset of weak ferromagnetic ordering, along with a sudden rise in magnetisation around similar to 30 K. This result indicates the magnetically active nature of Gd3+ ions possessing a large magnetic moment of similar to 8 mu(B) and this is explained by considering the two sub-lattice mode. The temperature dependence of the dielectric study shows unusual oppression in epsilon' and tan loss plots at T similar to T-N which hints a plausible MD coupling in the above studied samples. A contrasting behaviour in the temperature dependant MD% is seen for BFO and the substituted samples have an enhancement of similar to 30% for BGFO2 at 300 K. Further, confirmation to this coupling is drawn by studying frequency and magnetic field dependant MD% at 300 K, where it is found that both obey a power law of the form alpha exp(omega)(n) and alpha(H)(m) respectively. Interestingly, the values of 'n' and 'm' obtained from fitting are found to lie in the range 0.45-0.5, thus signifying a similar dependence of MD on frequency as well as magnetic field. Lastly, the effect of Gd3+ substitution on P-E loop of BFO and its substituted samples at room temperature have been discussed.
机译：我们在由钆（GD3 +）轻度取代的反铁磁体BI2FE4O9（BFO）中报告了一种增强的磁电电（MD）偶联。 RIETVELD精制X射线衍射和拉曼光谱揭示了所有合成样品的正交相位的形成。 Gd3 +取代导致从250k（x = 0，bfo）至256k（x = 0.02，bgfo2）的反铁磁性转变（t-n）的显着增加。同时，在T <= 30k的取代样品中的线性MH行为偏差意味着弱铁磁性排序的发作，随着磁化的突然升高，与30k相似。该结果表明GD3 +的磁性活跃性质通过考虑两个子晶格模式，解释具有类似于8μm（b）的大磁矩的离子。介电研究的温度依赖性在类似于T-N的εant'和TaN损耗图中显示出不寻常的压迫，其暗示在上述研究中的可粘合MD偶联。对BFO的温度依赖性MD％中的对比度行为，取代的样品具有与300k的BGFO2相似的增强。此外，通过在300时研究频率和磁场依赖性MD％来绘制对该偶联的确认k，发现分别遵守αExp（ω）（n）和α（h）（m）的αExp（n）和α（m）的动力法。有趣的是，发现从拟合中获得的“N”和“M”的值被发现位于0.45-0.5的范围内，因此在频率以及磁场上引起了MD的类似依赖性。最后，已经讨论了GD3 +取代对BFO的P-E环的影响及其在室温下的替代样品。

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  • 来源
    《RSC Advances》 |2016年第113期|共10页
  • 作者

    Mohapatra S. R.; Swain A.; Yadav C. S.; Kaushik S. D.; Singh A. K.;

  • 作者单位

    Natl Inst Technol Dept Phys &

    Astron Rourkela 769008 Odisha India;

    Univ Hyderabad Sch Phys Hyderabad 500046 Andhra Pradesh India;

    Indian Inst Technol Mandi Sch Basic Sci Mandi 175001 HP India;

    BARC UGC DAE Consortium Sci Res Mumbai Ctr R-5 Shed Bombay 400085 Maharashtra India;

    Natl Inst Technol Dept Phys &

    Astron Rourkela 769008 Odisha India;

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