INSTITUTO DE FISICA LA PLATA
Unidad Ejecutora - UE
congresos y reuniones científicas
Dipolar interaction and demagnetizing effects in magnetic nanoparticle dispersions
F. H. SÁNCHEZ; P. MENDOZA ZÉLIS; L. ARCINIEGAS; G. A. PASQUEVICH; M. B. FERNÁNDEZ VAN RAAP
Congreso; VI Reunión Nacional de Sólidos; 2015
Departamento de Física, UNLP
The problem of the influence of dipolar interactions on the magnetic response of nanoparticle (NP) dispersions has been a concern for decades and the subject of numerous papers. Although important advances were made, relevant aspects of dipolar interaction influence on NP response are frequently neglected, especially due to the lack of a simple conceptual frame useful for the treatment of this problem.Dipolar interactions between the NPs belonging to a solid or liquid dispersion give rise to modifications of susceptibility and NP magnetic moment characteristic time, in comparison to the values of these quantities in the absence of interactions. The appropriatedescription of this problem is relevant for applications of single domain magnetic NPs, for example in biomedicine.In this talk a useful approximation aimed to describe magnetic susceptibility of NP solid dispersions is introduced, and applied to experimental results.