Exchange Bias in Fe@Cr Core–Shell Nanoparticles

• DOI: 10.1021/nl401587t
• Publication Date: 2013-06-07T18:50:18Z
• Authors: Chris Binns; Muhammad T. Qureshi; Davide Peddis; Stephen H. Baker; Paul B. Howes; Adrian Boatwright; Stuart A. Cavill; Sarnjeet S. Dhesi; Leonardo Lari; Roland Kröger; Sean Langridge
• Keywords: Exchange bias; Magnetism; Ferrihydrite

We have used X-ray magnetic circular dichroism and magnetometry to study isolated Fe@Cr core–shell nanoparticles with an Fe core diameter of 2.7 nm (850 atoms) a Cr shell thickness varying between 1 2 monolayers. The addition shells significantly reduces the spin moment but does not change orbital moment. At least two atomic layers are required stabilize ferromagnetic/antiferromagnetic interface generate associated exchange bias increase in coercivity.