- 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.