Related Experiment Video
Updated: Sep 27, 2025
08:55
Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
8.6K
Shape dependent multiferroic behavior in Bi2Fe4O9nanoparticles.
Aditi Sahoo1, Dipten Bhattacharya1, Moumita Das2
1CSIR-Central Glass & Ceramic Research Institute, Kolkata 700032, India.
Nanotechnology
|April 12, 2022
Summary
Shape significantly influences the magnetic and ferroelectric properties of Bismuth Ferrite nanoparticles. Sphere-like nanoparticles show stronger magnetic ordering and magnetoelectric coupling compared to cuboid shapes.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Bismuth Ferrite (Bi2Fe4O9) nanoparticles are explored for their multiferroic potential.
- Controlling nanoparticle morphology is crucial for tuning material properties.
- Understanding shape-dependent magnetic and ferroelectric behavior is key for device applications.
Purpose of the Study:
- To investigate the impact of particle shape (cuboid vs. sphere-like) on the magnetic and ferroelectric properties of Bi2Fe4O9 nanoparticles.
- To explore the magnetoelectric coupling in these shaped nanoparticles.
- To correlate observed properties with shape anisotropy.
Main Methods:
- Synthesis of Bi2Fe4O9 nanoparticles with distinct shapes (cuboid and sphere-like) using hydrothermal and sol-gel methods.
- Magnetic property characterization, including measurement of coercivity, Neel temperature, remanent magnetization, and exchange bias.
- Ferroelectric property characterization, including measurement of remanent polarization and coercivity.
- Investigation of magnetoelectric coupling by measuring polarization changes under an applied magnetic field.
Main Results:
- Magnetic properties (coercivity, Neel temperature, remanent magnetization) are strongly shape-dependent, with sphere-like particles exhibiting higher values.
- Sphere-like Bi2Fe4O9 nanoparticles display antiferromagnetic ordering with a ferromagnetic component, while cuboid shapes show dominant antiferromagnetic behavior.
- Ferroelectric measurements indicate higher remanent polarization in cuboid nanoparticles, but sphere-like nanoparticles exhibit greater magnetoelectric coupling.
- A decrease in polarization with increasing magnetic field was observed, signifying magnetoelectric coupling.
Conclusions:
- Nanoparticle shape anisotropy is the primary factor governing the distinct magnetic and ferroelectric properties of Bi2Fe4O9.
- Sphere-like Bi2Fe4O9 nanoparticles demonstrate superior magnetoelectric coupling, suggesting potential for applications in sensors and memory devices.
- The study highlights the importance of shape control in designing advanced multiferroic nanomaterials.
More Related Videos
10:45Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition
Published on: February 5, 2022
4.4K
09:06Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
8.2K
Related Concept Videos
01:31Ferromagnetism
2.5K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
2.5K
03:02Colors and Magnetism
12.4K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
12.4K
02:42Valence Bond Theory
9.8K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
9.8K
01:26Diamagnetism
2.5K
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
2.5K