Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 54: Poster Session 3
CPP 54.45: Poster
Donnerstag, 3. April 2014, 15:00–19:00, P2
Meanfield approach to describe magnetic properties of anisotropic dipolar particles — •Taisia Prokopyeva1 and Sofia Kantorovich1,2 — 1Ural Federal University, Lenin av. 51, Ekaterinburg,620000, Russia — 2University of Vienna, Sensengasse 8, 1090, Wien, Austria
Various specially designed colloidal particles became accessible in experiment. The synthesis of such systems is still a challenge, and one needs reliable predictions for the relationship between the particle parameters (sizes, magnetic-nonmagnetic ratios, shape anisotropy) and the macro properties of large particle systems. Several types of magnetic colloids were synthesized, whose properties differed significantly from those of magnetic spherical single-domain nanoparticles in magnetic fluids. It is convenient to divide ``non-standard" magnetic colloids into two groups according to their anisotropy. If the anisotropy is related to the particle shape, then for magnetic particles the dipole-dipole interaction remains the same and the anisotropy only affects the steric interactions. Whereas, if the particles retain a spherical shape, however the dipole moment itself is shifted away from the particle centre of mass (anisotropic particles), the dipolar part of the Hamiltonian will change. Here, we focus our attention on the theoretical investigation of magnetic properties of recently introduced sd-particles [Kantorovich et al., Soft Mater, 2011] and magnetic Janus particles [Ruditskiy et al., Soft Mater, 2013]. We develop a first-order mean field approach to study the magnetization and susceptibility of these systems and verify our theory by comparing to the computer simulations.