Asymmetric Roughness of Elastic Interfaces at the Depinning Threshold

被引：4

作者：

Toivonen, Esko ^{[1
]}

Molkkari, Matti ^{[1
]}

Rasanen, Esa ^{[1
]}

Laurson, Lasse ^{[1
]}

机构：

[1] Tampere Univ, Computat Phys Lab, POB 692, FI-33014 Tampere, Finland

来源：

PHYSICAL REVIEW LETTERS | 2022年 / 129卷 / 17期

关键词：

DYNAMICS; DISLOCATION; CREEP;

D O I：

10.1103/PhysRevLett.129.175701

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Roughness of driven elastic interfaces in random media is typically understood to be characterized by a single roughness exponent.. We show that at the depinning threshold, due to symmetry breaking caused by the direction of the driving force, elastic interfaces with local, long-range, and mean-field elasticity exhibit asymmetric roughness. It is manifested as a skewed distribution of the local interface heights, and can be quantified by using detrended fluctuation analysis to compute a spectrum of local, segment-level scaling exponents. The asymmetry is observed as approximately linear dependence of the local scaling exponents on the difference of the segment height from the mean interface height.

引用

页数：6

共 32 条

[1] Domain-wall roughness in GdFeCo thin films: Crossover length scales and roughness exponents [J].