Exchange Bias in Fe@Cr Core-Shell Nanoparticles
journal contributionposted on 11.09.2013, 14:39 by Christopher 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
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) and a Cr shell thickness varying between 1 and 2 monolayers. The addition of Cr shells significantly reduces the spin moment but does not change the orbital moment. At least two Cr atomic layers are required to stabilize a ferromagnetic/antiferromagnetic interface and generate the associated exchange bias and increase in coercivity.