- Author
-
Nolle, C. S.
|
Koiller, B.
|
Martys, N. S.
|
Robbins, M. O.
- Title
- Effect of Quenched Disorder on Moving Interfaces in Two Dimensions.
- Coporate
- Johns Hopkins Univ., Baltimore, MD
Pontificia Universidade Catolica do Rio de Janerio, Brazil
National Institute of Standards and Technology, Gaithersburg, MD
- Journal
-
Physica A,
Vol. 205,
342-354,
1994
- Sponsor
- National Science Foundation, Washington, DC
- Contract
- DMR091004
INT-9217408
- Keywords
-
morphology
|
dynamics
|
velocity
- Abstract
- We consider the morphology and dynamics of an interface driven through a random two-dimensional medium by an applied force. The onset of motion is a critical phenomenon, with mean velocity avove the threshold force. Fluctuations in the velocity exhibit a power law noise spectrum. At large length scales the moving interfaces are self-affine with roughness exponent. There is a crossover to different scaling behavior below the correlation length. The type of scaling at small lengths depends upon the nature and strength of the disorder. Two examples are considered - a magnetic domain wall model exhibiting self-similar structure characteristic of percolation, and a fluid invasion model which produces self-affine scaling.