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We discuss experimentally realizable situations in which surface effects may"screen out" the dipolar interactions in an assembly of nanomagnets, which thenbehaves as a noninteracting system. We consider three examples of physicalobservables, equilibrium magnetization, ac susceptibility and ferromagneticresonance spectrum, to illustrate this screening effect. For this purpose, wesummarize the formalism that accounts for both the intrinsic features of thenanomagnets and their collective effects within an assembly the condition forscreening.

Single-particle versus collective effects in assemblies of nanomagnets: screening