title: A two-population analysis of the magnetic dipolar interaction in superparamagnetic systems: a Monte Carlo study.
abstract: To understand the influence of the magnetic dipolar interaction on the blocking temperature (T(B)) of superparamagnetic systems, usual models treat the dipolar energy as an additional term to the single-particle anisotropy energy barrier. However, such approaches cannot describe non-monotonic T(B)(c) dependences as reported both experimental and theoretically. Therefore, alternative approaches should be explored. For such a purpose, in this work we investigate a simple approach based on splitting the total population of the system into two subgroups, depending on its relative orientation (parallel- or antiparallel-aligned) with respect to the applied magnetic field direction. The suitability of such approach was explored by means of a Monte Carlo technique that provided us with a good insight into the properties of the system. Our results indicate that this two-population analysis can be a promising way to understand the SPM behaviour of interacting nanomagnetic systems.
authors.affiliation: Instituto de Investigacións Tecnolóxicas and Departamento de Física Aplicada, Universidade de Santiago de Compostela, E-15782 Galiza, Spain.
authors.forename: D
authors.initials: D
authors.lastname: Serantes
authors.forename: M
authors.initials: M
authors.lastname: Pereiro
authors.forename: D
authors.initials: D
authors.lastname: Baldomir