Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

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
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

1.4K
In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
1.4K
Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

961
An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
961
Diamagnetism01:26

Diamagnetism

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....
2.5K
Colors and Magnetism03:02

Colors and Magnetism

12.3K
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...
12.3K
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

1.1K
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
1.1K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Superparamagnetic Nanoparticles with Phosphorescent Complexes as Hybrid Contrast Agents: Integration of MRI and PLIM.

Small science·2025
Same author

Superconducting NbC nanoparticles synthesized by laser ablation in a liquid.

Physical chemistry chemical physics : PCCP·2024
Same author

Photoluminescence and magnetic properties of isostructural europium(III), gadolinium(III) and terbium(III) oxamate-based coordination polymers.

Dalton transactions (Cambridge, England : 2003)·2024
Same author

Control of Anisotropy and Magnetic Hyperthermia Effect by Addition of Cobalt on Magnetite Nanoparticles.

ACS applied materials & interfaces·2024
Same author

Iron Oxide Nanoparticles in a Dynamic Flux: Magnetic Hyperthermia Effect on Flowing Heavy Crude Oil.

ACS omega·2023
Same author

Observation of magnetic vortex configuration in non-stoichiometric Fe<sub>3</sub>O<sub>4</sub> nanospheres.

Nanoscale advances·2023
Same journal

Spider-Silk-Like Single-Fiber Actuators with Two Actuation Modes Driven by Water.

Nano letters·2026
Same journal

Clicking 1,4-Dithiin Conjugated Dimaleimides for Chiroptical Evolution and Nanofabrication.

Nano letters·2026
Same journal

Dynamic Quantum Gate Based on Controllable Chiral Liquid Crystal Nanostructure.

Nano letters·2026
Same journal

Activating Phase-Transition Toughening in van der Waals Semiconductor GaTe.

Nano letters·2026
Same journal

Dual-Mode Nucleation and Dynamic Alloying of Silicon on Ag(111).

Nano letters·2026
Same journal

Surface-Neutralized HgCdSe Quantum Dots for High-Detectivity Infrared Photodetectors.

Nano letters·2026
See all related articles

Related Experiment Video

Updated: Sep 12, 2025

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
07:42

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

Published on: July 20, 2022

2.9K

Engineering Graded Magnetic Anisotropy via Cation Interdiffusion in Core/Shell Nanoparticles.

Juan M Orozco-Henao1, Adriele A Almeida2, Fernando Fabris2,3

  • 1Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas, Universidad Nacional de La Plata-CONICET, Diagonal 113 y 64 S/N, La Plata 1900, Argentina.

Nano Letters
|August 8, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed compositionally graded spinel ferrite nanoparticles by controlling cation diffusion. This method enhances magnetic properties like coercivity and anisotropy, offering a new way to tune nanomaterial characteristics.

Keywords:
cation diffusioncore/shell nanoparticlesgraded interfacemagnetic anisotropyspinel ferrite

More Related Videos

Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition
10:45

Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition

Published on: February 5, 2022

4.3K
Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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

Related Experiment Videos

Last Updated: Sep 12, 2025

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
07:42

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

Published on: July 20, 2022

2.9K
Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition
10:45

Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition

Published on: February 5, 2022

4.3K
Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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

Area of Science:

  • Materials Science
  • Nanotechnology
  • Magnetism

Background:

  • Spinel ferrite nanoparticles (NPs) offer diverse functional properties.
  • Engineering nonhomogeneous composition profiles in NPs is challenging.

Purpose of the Study:

  • To develop a method for preparing compositionally graded spinel ferrite NPs.
  • To investigate the impact of graded composition on magnetic properties.

Main Methods:

  • Utilized Fe3O4/CoFe2O4 core/shell NPs as precursors.
  • Employed controlled interfacial diffusion of metal cations via thermal annealing.
  • Analyzed cation redistribution using electron microscopy and elemental mapping.

Main Results:

  • Achieved compositionally graded spinel structures with a Co-rich outer layer after annealing above 200 °C.
  • Observed significant increases in coercivity and high-field susceptibility.
  • Quantitatively described enhanced effective anisotropy by modeling Co diffusion.

Conclusions:

  • Demonstrated a robust strategy for creating anisotropy-graded spinel ferrite NPs.
  • This approach allows for precise tailoring of complex metal oxide nanostructures.
  • Provides a broadly applicable method for property tuning in nanomaterials.