Two-dimensional Monte Carlo Simulations of a Colloidal Dispersion Composed of Polydisperse Ferromagnetic Particles: For the Case of No External Magnetic Field

2003 ◽  
Vol 29 (5) ◽  
pp. 646-652 ◽  
Author(s):  
Masayuki Aoshima ◽  
Akira Satoh
Keyword(s):  
Magnetic Field ◽  
Monte Carlo ◽  
External Magnetic Field ◽  
Monte Carlo Simulations ◽  
Colloidal Dispersion ◽  
Two Dimensional ◽  
Ferromagnetic Particles

Domain Analysis and Magnetic Relaxation in Thin Films

1998 ◽  
Vol 09 (06) ◽  
pp. 821-825 ◽  
Author(s):  
Tatiana G. Rappoport ◽  
F. S. de Menezes ◽  
L. C. Sampaio ◽  
M. P. Albuquerque ◽  
F. Mello
Keyword(s):  
Magnetic Field ◽  
Thin Films ◽  
Monte Carlo ◽  
Ising Model ◽  
Monte Carlo Simulations ◽  
Magnetic Relaxation ◽  
Film Plane ◽  
Relative Strength ◽  
Two Dimensional ◽  
Magnetic Domains

We have simulated the magnetic relaxation (M(t)) and the nucleation of magnetic domains in the presence of magnetic field in thin films with anisotropy perpendicular to the film plane. We have used Monte Carlo simulations based on the two-dimensional classical Ising model including the long-range dipole–dipole and Zeeman interactions. Domains nucleated during the magnetic relaxation exhibit very rough interfaces. We analyze the roughness and the M(t) as a function of the relative strength of dipole–dipole and Zeeman terms.

EQUILIBRIUM PATTERNS OF CHAIN CLUSTERS COMPOSED OF FERROMAGNETIC PARTICLES IN AN EXTERNAL MAGNETIC FIELD

2002 ◽  
Vol 16 (17n18) ◽  
pp. 2352-2356 ◽  
Author(s):  
TOMOFUMI UKAI ◽  
TORU MAEKAWA ◽  
HISAO MORIMOTO
Keyword(s):  
Magnetic Field ◽  
Monte Carlo ◽  
Dipole Moment ◽  
External Magnetic Field ◽  
Thermal Energy ◽  
Colloidal System ◽  
Control Parameters ◽  
Ordered Structures ◽  
Pattern Formations ◽  
Ferromagnetic Particles

We carry out Monte Carlo simulations of a ferromagnetic colloidal system, which is subjected to an external magnetic field, to investigate the structures formed by chain clusters. The control parameters are the ratio of the dipole moment energy to thermal energy, λ, and the ratio of the interactive energy between the dipole and the external magnetic field to thermal energy, ξ. We investigate the effect of the system height on the pattern formations for λ=18 and ξ=30, ∞. Note that the system becomes paramagnetic when ξ=∞. We find that as the system height increases, chains coagulate to form fat clusters and spatially ordered structures are created when ξ=30, whereas chains form thin meandering walls when ξ=∞.

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