Effect of initial states on the phase diagram of the structural pattern inmagnetic fluid films under perpendicular magnetic field

Citation
Cy. Hong et al., Effect of initial states on the phase diagram of the structural pattern inmagnetic fluid films under perpendicular magnetic field, APPL PHYS L, 79(15), 2001, pp. 2360-2362
Citations number
6
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
APPLIED PHYSICS LETTERS
ISSN journal
0003-6951 → ACNP
Volume
79
Issue
15
Year of publication
2001
Pages
2360 - 2362
Database
ISI
SICI code
0003-6951(20011008)79:15<2360:EOISOT>2.0.ZU;2-G
Abstract
When a magnetic fluid thin film is subjected to a magnetic field perpendicu lar to the plane of the film, a portion of magnetic particles is condensed out from the initially monodispersed magnetic fluid and forms magnetic colu mns. These columns evolve from a disordered column phase to a two-dimension al ordered structural pattern as the field strength reaches some critical v alue, H-h. The structural pattern formative process of the ordered structur es that follows depends on the condition of the disordered column phase. In the letter, the effect of the initial disordered column phase, which can b e altered by changing the initial field strength, H-i, on the formative pro cess of the ordered structures is studied, and a phase diagram on the H-H-i plane is constructed. With an initial field strength that exceeds H-h, the structural pattern formative process goes through a plateau, a transition phase, and another plateau. On the other hand, if the initial field strengt h is less than H-h, the columns in the disordered column phase split and ne w columns emerge in the magnetic fluid film as the field strength increases . Finally, the structural pattern reaches a plateau. In both processes, the distance between columns in the structural patterns converges to that of a pseudostatic case. (C) 2001 American Institute of Physics.