  Molecular dynamics simulations and density functional theory calculations
have been used to demonstrate the possibility of preserving high spin states of
the magnetic cores within Ni-based core-shell bimetallic nanoalloys over a wide
range of temperatures. We show that, unlike the case of Ni-Al clusters, Ni-Ag
clusters preserve high spin states (up to 8 $\mu_{\mathrm{B}}$ in case of
Ni$_{13}$Ag$_{32}$ cluster) due to small hybridization between the electronic
levels of two species. Intriguingly, such clusters are also able to maintain
geometrical and electronic integrity of their cores at temperatures up to 1000
K (e.g. for Ni$_{7}$Ag$_{27}$ cluster). Furthermore, we also show the
possibility of creating ordered arrays of such magnetic clusters on a suitable
support by soft-landing pre-formed clusters on the surface, without introducing
much disturbance in geometrical and electronic structure of the cluster. We
illustrate this approach with the example of Ni$_{13}$Ag$_{38}$ clusters
adsorbed on the Si(111)-(7$\times$7) surface, which, having two distinctive
halves to the unit cell, acts as a selective template for cluster deposition.
