4.6 Article

Shape dependent multiferroic behavior in Bi2Fe4O9 nanoparticles

Journal

NANOTECHNOLOGY
Volume 33, Issue 30, Pages -

Publisher

IOP Publishing Ltd
DOI: 10.1088/1361-6528/ac667d

Keywords

Bi2Fe4O9 nanoparticle; ferroelectricity; magnetism; magnetoelectric coupling; shape anisotropy

Funding

  1. Department of Science Technology (DST)

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Ferroelectric and magnetic properties are investigated for Bi2Fe4O9 nanoparticles with different shapes. 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. These shape dependent magnetic and ferroelectric properties are coming because of shape anisotropy.
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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