Abstract
We present a study of the magnetic properties of compact Cr clusters deposited on Fe(001). A Cr monolayer deposited on Fe(001) is found to be c(2×2) ferrimagnetic (AP) and the moments of a single adatom and very small clusters are antiferromagnetically aligned with the Fe substrate moments (P). Therefore a transition from P to AP order is expected when the cluster size increases. An Ising model is used to model the magnetic energy of two geometric configurations, a square-shaped and a diamond-shaped cluster. Self-consistent tight-binding calculations allow us to determine the P to AP transition which is obtained for a 400 adatoms square-shaped cluster. The pair magnetic energies have been estimated to −105.7 meV for the first neighbors Fe–Cr interaction and to −111.3 meV for the second neighbors Cr–Cr interaction in the Ising model.
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