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Related Experiment Video

Updated: May 10, 2026

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles

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Published on: March 2, 2016

Exchange bias in Fe@Cr core-shell nanoparticles.

Chris Binns¹, Muhammad T Qureshi, Davide Peddis

¹Department of Physics and Astronomy, University of Leicester , Leicester LE1 7RH, United Kingdom.

|June 11, 2013

Summary

Adding chromium shells to iron nanoparticles affects their magnetic properties. Two chromium layers are needed to create exchange bias and increase coercivity in these core-shell nanoparticles.

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Energy Dispersive X-ray Tomography for 3D Elemental Mapping of Individual Nanoparticles

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Published on: July 5, 2016

Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Core-shell nanoparticles offer tunable magnetic properties.
Understanding interfacial effects in magnetic nanostructures is crucial.

Purpose of the Study:

Investigate the magnetic behavior of iron (Fe) core and chromium (Cr) shell nanoparticles.
Determine the effect of Cr shell thickness on magnetic properties.
Analyze the conditions for achieving exchange bias.

Main Methods:

Utilized X-ray magnetic circular dichroism (XMCD) spectroscopy.
Employed magnetometry techniques.
Studied isolated Fe@Cr core-shell nanoparticles with varying Cr shell thicknesses (1-2 monolayers).

Main Results:

Chromium shells significantly reduced the spin magnetic moment of the Fe core.
Orbital magnetic moment remained largely unchanged with Cr shell addition.
A minimum of two Cr atomic layers was necessary to stabilize a ferromagnetic/antiferromagnetic interface.

Conclusions:

The interfacial coupling between Fe and Cr is critical for magnetic behavior.
Exchange bias and increased coercivity are observed only with sufficient Cr shell thickness.
Fe@Cr core-shell nanoparticles require specific interfacial engineering for desired magnetic functionalities.