- Author
-
Nolle, C. S.
|
Koiller, B.
|
Martys, N. S.
|
Robbins, M. O.
- Title
- Morphology and Dynamics of Interfaces in Random Two-Dimensional Media.
- Coporate
- Johns Hopkins Univ., Baltimore, MD
Pontificia Universidade Catolica do Rio de Janeiro, Brazil
National Institute of Standards and Technology, Gaithersburg, MD
- Journal
-
Physical Review Letters,
Vol. 71,
No. 13,
2074-2077,
September 27, 1993
- Sponsor
- National Science Foundation, Washington, DC
- Contract
- NSF-GRANT-DMR-9110004
- Keywords
-
morphology
|
dynamics
|
interfaces
- Abstract
- We study the morphology and dynamics of an interface driven through a disordered two-dimensional medium by an applied force. At large length scales the interface is self-affine with roughness exponent alpha = 1/2. The structure at small scales may be self-similar or self-affine, depending on the degree of disorder. Simulations of wetting invasion produce self-affine interfaces with alpha = 0.8 and a power law distribution of local interface velocities. Numerical results are in excellent agreement with experiment. A technique that distinguishes between true self-affine scaling and a crossover is presented, and applied to the invasion model and a model for magnetic domain growth.