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    • Shape Dependent Multiferroic Behavior in Bi2Fe4O9 Nanoparticles

    Aditi Sahoo,Dipten Bhattacharya,Moumita Das,Prabhat Mandal

    Nanotechnology（2022）SCI 3区SCI 4区

    CSIR Cent Glass & Ceram Res Inst | Saha Inst Nucl Phys

    Cited 7|Views6
    Abstract
    Ferroelectric and magnetic properties are investigated for Bi2Fe4O9 nanoparticles with different shapes (cuboid and sphere-like) synthesized by hydrothermal and sol-gel method. The magnetic study reveals that coercivity, Neel temperature and remanent magnetization strongly depend on shape of the particle. The nanoparticle with sphere-like shape exhibits magnetization curve of antiferromagnetic (AFM) ordering with ferromagnetic (FM) component. As the particle shape changes from sphere-like to cuboid, the AFM component is dominating over the ferromagnetic component. A small exchange bias is also observed at low temperature in both the sphere-like and cuboid nanoparticle. The coercivity, remanent magnetization and Neel temperature of sphere-like nanoparticle is greater than cuboid nanoparticle. Ferroelectric measurement shows the remanent polarization of cuboid is greater than sphere-like nanoparticle but the coercivity is almost same. This Bi2Fe4O9 nanoparticle shows a small change in polarization under magnetic field. The polarization value decreases with magnetic field increases. The magnetoelectric coupling-measured by change of remanent polarization under magnetic field are found to be greater in Bi2Fe4O9 sphere-like nanoparticles. These shape dependent magnetic and ferroelectric properties are coming because of shape anisotropy.
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    Key words
    Bi2Fe4O9 nanoparticle,ferroelectricity,magnetism,magnetoelectric coupling,shape anisotropy
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    【要点】：论文研究了不同形状的Bi2Fe4O9纳米颗粒（立方体和球状）的磁电性质，发现形状依赖的磁性和铁电性行为，揭示了形状各向异性对磁电耦合的影响。
    

    【方法】：采用水热法和溶胶-凝胶法合成了不同形状的Bi2Fe4O9纳米颗粒，并通过磁性研究和铁电测量探讨了其性质。
    

    【实验】：通过磁性研究和铁电测量，使用的数据集包括不同形状纳米颗粒的磁化和铁电性质数据，结果显示球状纳米颗粒的磁化曲线表现为反铁磁有序与铁磁成分，而立方体形状的纳米颗粒则表现为反铁磁成分占主导。在低温下，两种形状的纳米颗粒均观察到小的交换偏置。铁电测量显示，立方体纳米颗粒的剩余极化大于球状纳米颗粒，但矫顽力几乎相同。磁电耦合测量发现，球状纳米颗粒在磁场下的剩余极化变化更大。