Magnetocaloric effects in magnetic nanoparticle systems: A Monte Carlo study

Influence of the nanoparticle size on the blocking temperature of interacting systems: Monte Carlo simulations

“…1, the blocking temperature obtained from the peak of ZFC curves is plotted as a function of V/V o for different particle concentrations. Results have a relatively high error because for moderate and high applied fields or high particle concentrations the maximum is not well defined [7,9,10]. Also, the blocking temperatures at low volumes are less accurate and are subjected to larger calculation errors; so, some deviations at low V/V o can be observed.…”

“…A system of N = 64 monodisperse nanoparticles was placed in a cubic simulation cell where they have fixed positions with Lennard-Jones liquid-like arrangement [7][8][9][10]. The easy axes were chosen randomly.…”

Interplay between the magnetic field and the dipolar interaction on a magnetic nanoparticle system: A Monte Carlo study

“…The interest on these systems lays on the different magnetic properties that current materials exhibit at the nanometer scale [4], which strongly depend on both the intrinsic characteristics of the particles (shape, anisotropy, size) and on external parameters (applied magnetic field, dipolar interaction). In the literature it has been widely studied the role played by the magnetic field [5] and the magnetic dipolar interaction [6], although as separate influences. We present in this work a numerical approach to the interplay between the magnetic field and the dipolar interaction on the superparamagnetic properties of a magnetic nanoparticle system.…”

Controlling of magnetocaloric effect in Gd2O3@SiO2 nanocomposites by substrate dimensionality and particles’ concentration

“…At higher temperature region, slight increase of ∆S M with decreasing temperature can be seen. Gradual enhancement of -∆S M with the increase of magnetic field change is also evident for all the samples in the 23 and they are comparable with GdAl 2 @Al 2 O 3 nanocapsules, 21 where ∆S M (T) can reach the largest values of 18.02, 18.71, and 31.01 J/kgK at 7.5 K for field variation from 1-7 T, and oxalate-bridged Gd(III) coordination polymers 24 with ∆S M (T) = 32.9 J/kgK at 2.6 K for field variation 1-7 T.…”