Model for the growth of electrodeposited ferromagnetic aggregates under an in-plane magnetic field.
The quasi-two-dimensional deposition of ferromagnetic materials by electrochemical process under the influence of a magnetic field applied in the plane of the growth leads to a surprising symmetry breaking in the dendritic structures found. The reasons for these features are still not completely understood. The original dense circular envelope becomes rectangular, as well as the sparse figures have their shapes elongated. This paper reports the results of a diffusion-limited aggregation (DLA) -like simulation. The model proposed here, a modification of the original DLA model, can deal with ferromagnetic particles under the influence of an electric field and the dipolar interactions between particles, submitted to an applied magnetic field in the plane of growth of such structures. The results were produced varying the applied magnetic field and the magnetic moment of the particles and show that the balance between these interactions is an important mechanisms that can be responsible for the changes in shape of the aggregates observed in the experiments.
Cronemberger
C
C
CBPF-MCT, Rua Dr Xavier Sigaud, 150, 22290-180 Rio de Janeiro, RJ, Brazil. carolina@cbpf.br
Sampaio
L C
LC
Guimarães
A P
AP
Molho
P
P