Field-dependent phase diagram of the structural pattern in a ferrofluid film under perpendicular magnetic field

Citation
Cy. Hong et al., Field-dependent phase diagram of the structural pattern in a ferrofluid film under perpendicular magnetic field, J MAGN MAGN, 226, 2001, pp. 1881-1883
Citations number
7
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
ISSN journal
0304-8853 → ACNP
Volume
226
Year of publication
2001
Part
2
Pages
1881 - 1883
Database
ISI
SICI code
0304-8853(200105)226:<1881:FPDOTS>2.0.ZU;2-W
Abstract
Influences of both the magnetic field strength H and the sweep rate dH/dt o n the structural pattern evolution in a magnetic fluid film under perpendic ular fields are systematically investigated. When the magnetic field is inc reased at a given rate, the structure evolves from a monodispersed state to a disordered one, then to the first-level ordered hexagonal structure, and finally to the second-level ordered structure through a transition state. With a higher dH/dt, the range of the applied magnetic field corresponding to the first-level ordered structure is widened and the field H-s, at which the transition occurs becomes higher. An empirical power law H-s proportio nal to (dH/dt)(0.4) was found. A phase diagram for the magnetic fluid film in the H-dH/dt plane is presented. (C) 2001 Elsevier Science B.V. All right s reserved.