TY - JOUR
T1 - Thermal activated variation in the ordered structures in magnetic fluids films
AU - Hong, Chin Yih
AU - Ke, Y. H.
AU - Horng, H. E.
AU - Yang, S. Y.
AU - Yang, H. C.
N1 - Funding Information:
This work was supported by National Science Council of R.O.C. under Grant Nos. NSC91-2212-E212-010 and NSC91-2112-M003-013, NSC93-2120-M-003-001 and NSC93-2112-M-003-007.
PY - 2005/3
Y1 - 2005/3
N2 - A hexagonal ordered structure of magnetic columns is achieved in a highly homogeneous magnetic fluid film under an external magnetic field perpendicular to the film surface. At a fixed temperature, the magnetic columns are stable. When the temperature rises, the columns remain unchanged initially, and then some of them disappear as the temperature exceeds a critical value. Furthermore, all columns disappear when the temperature is further raised. The column disappearance was due to the dispersion of column particles into the liquid at a higher temperature. The critical temperature, at which the column particles start to melt, was found to increase under a stronger magnetic field. The relationships between the critical temperature and the fluid concentration, as well as the film thickness, are investigated. Thus, the role of temperature in the stability of ordered structures in the magnetic fluid film is clarified.
AB - A hexagonal ordered structure of magnetic columns is achieved in a highly homogeneous magnetic fluid film under an external magnetic field perpendicular to the film surface. At a fixed temperature, the magnetic columns are stable. When the temperature rises, the columns remain unchanged initially, and then some of them disappear as the temperature exceeds a critical value. Furthermore, all columns disappear when the temperature is further raised. The column disappearance was due to the dispersion of column particles into the liquid at a higher temperature. The critical temperature, at which the column particles start to melt, was found to increase under a stronger magnetic field. The relationships between the critical temperature and the fluid concentration, as well as the film thickness, are investigated. Thus, the role of temperature in the stability of ordered structures in the magnetic fluid film is clarified.
KW - Magnetic fluid
KW - Ordered structure
KW - Thermal stability
UR - http://www.scopus.com/inward/record.url?scp=14844323009&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=14844323009&partnerID=8YFLogxK
U2 - 10.1016/j.jmmm.2004.11.027
DO - 10.1016/j.jmmm.2004.11.027
M3 - Article
AN - SCOPUS:14844323009
SN - 0304-8853
VL - 289
SP - 93
EP - 96
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
ER -