Enhanced magnetic properties and room temperature magnetodielectric response in (1-x) Bi2Fe4O9 – (x) La0·67Sr0·33MnO3 (x = 0.1-0.3) composites

IF 4.9 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of Physics and Chemistry of Solids Pub Date : 2025-09-02 DOI:10.1016/j.jpcs.2025.113159

Abhipsa Pati , S.R. Mohapatra , S.D. Kaushik , Soumen Dhara , D.P. Sahu , A.K. Singh , Jyotika Nanda , Satya N. Tripathy

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引用次数: 0

Abstract

We report an enhanced magnetic and magnetodielectric (MD) coupling in antiferromagnetic (AFM) spin frustrated Bi₂Fe₄O₉ (BFO) turned composite with substantial variation of La₀_·₆₇Sr₀_·₃₃MnO₃ (LSMO). Phase formation is confirmed from room temperature Rietveld refinement of X-ray diffraction data. The composite shows orthorhombic crystal structure with space-group ‘Pbam + Pbnm’ which is also well supported from Raman spectra. XPS analysis confirmed the existence of multiple valence states of magnetic ions such as Fe²⁺:Fe³⁺:Fe⁴⁺ = 41:45:14 and Mn³⁺:Mn⁴⁺ = 88:12, within experimental limit. This triggers super-exchange and double-exchange interactions thereby contributing significantly to the dielectric and magnetic order parameters. At the same time, with increase in LSMO content an increase in AFM transition temperature (T_N) close to room temperature is observed. An irreversibility in ZFC-FC data is evidenced for T < 350 K along with an opening in M − H plot, indicating spin-glass behaviour and an onset of weak ferromagnetism in the composites. The latter is found to get enhanced significantly with increase in LSMO content and is also verified from Arrott plots. The dielectric measurements at 0 T and 1.3 T shows anomaly around T_N, hinting at plausible MD coupling. Further, confirmation to the intrinsic MD coupling is assisted by temperature and magnetic field variation of magnetodielectric effect (MD%) which shows enhanced MD effect effective at room temperature. This intriguing MD coupling could be attributed to inverse Dzyalonshinskii-Moriya interactions between magnetic ions present in the composite due to strong cross coupling. Lastly, from Landau free energy expression, the existence of biquadratic nature of magnetoelectric coupling (P²M²) emerging from the coupling term ‘γP²M²’ is established. At 300 K, γ is ∼1.6 × 10⁻² (emu/g)⁻² for BL70-30 and shows ∼2 % MD response – a nearly eight-fold increase as compared to parent BFO. Hence, the above outcomes highlight the significance of the composite as a viable candidate for multifunctional applications.

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增强了（1-x） Bi2Fe4O9 - (x) La0·67Sr0·33MnO3 （x = 0.1-0.3）复合材料的磁性能和室温磁介电响应

我们报道了反铁磁（AFM）自旋受挫Bi2Fe4O9 （BFO）翻转复合材料的磁性和磁介电（MD）耦合增强，La0·67Sr0·33MnO3 （LSMO）发生了实质性变化。相形成是由室温里特维尔德细化x射线衍射数据证实。该复合材料具有空间基为“Pbam + Pbnm”的正交晶型结构，拉曼光谱也证实了这一点。XPS分析证实了Fe2+:Fe3+:Fe4+ = 41:45:14、Mn3+:Mn4+ = 88:12等多种价态的存在，在实验范围内。这触发了超交换和双交换相互作用，从而对介电和磁序参数做出了重大贡献。同时，随着LSMO含量的增加，AFM转变温度（TN）逐渐升高，接近室温。ZFC-FC数据的不可逆性在T <； 350 K时被证明，同时在M - H图中有一个开口，表明复合材料具有自旋玻璃行为和弱铁磁性的开始。后者随着LSMO含量的增加而显著增强，Arrott图也证实了这一点。在0 T和1.3 T处的介电测量显示在TN附近有异常，暗示可能存在MD耦合。此外，磁介电效应（MD%）的温度和磁场变化有助于确认本征磁介电耦合，表明室温下磁介电效应有效增强。这种有趣的MD耦合可以归因于复合材料中存在的磁性离子之间由于强交叉耦合而产生的逆Dzyalonshinskii-Moriya相互作用。最后，从朗道自由能表达式出发，证明了耦合项“γP2M2”产生的磁电耦合（P2M2）存在双二次性质。在300 K时，BL70-30的γ为~ 1.6 × 10−2 (emu/g)−2，并显示出~ 2%的MD响应-与母体BFO相比增加了近8倍。因此，上述结果突出了复合材料作为多功能应用的可行候选材料的重要性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Physics and Chemistry of Solids 工程技术-化学综合

CiteScore

7.80

自引率

2.50%

发文量

605

审稿时长

40 days

期刊介绍： The Journal of Physics and Chemistry of Solids is a well-established international medium for publication of archival research in condensed matter and materials sciences. Areas of interest broadly include experimental and theoretical research on electronic, magnetic, spectroscopic and structural properties as well as the statistical mechanics and thermodynamics of materials. The focus is on gaining physical and chemical insight into the properties and potential applications of condensed matter systems. Within the broad scope of the journal, beyond regular contributions, the editors have identified submissions in the following areas of physics and chemistry of solids to be of special current interest to the journal: Low-dimensional systems Exotic states of quantum electron matter including topological phases Energy conversion and storage Interfaces, nanoparticles and catalysts.