Magnetic properties of ultra-thin (Fe, Co) films coupled by Ir(001) spacers

A Perspective on Modelling Metallic Magnetic Nanoparticles in Biomedicine: From Monometals to Nanoalloys and Ligand-Protected Particles

“…When ultrathin films of cobalt atoms were deposited on Rh (111) and Pt(111) surfaces, the MAE values measured were −0.37 ± 0.05 and −0.29 meV per Co atom, respectively [334]. The combination of Co and Ir in a three-layer system gave rise to a similar anisotropy of 0.46 meV per atom, whereas only 0.02 meV MAE per atom was calculated for the Fe-Co-Ir system [335]. Furthermore, significant oscillations were observed in the interlayer exchange coupling for systems of varying numbers of Co and 4d transition-metal series layers, and the following quantitative trends of magnetic properties were formulated as a result: across the noble metals and Pd, a ferromagnetic interlayer coupling was found; for the post-noble metals and most 4d transition metals (with the exception of Mo), an antiferromagnetic interlayer coupling was obtained, meaning that the choice of the metal can influence the easy axis of magnetisation [336].…”