Domain-wall roughness in GdFeCo thin films: crossover length scales and roughness exponents

Domain-wall dynamics and spatial fluctuations are closely related to each other and to universal features of disordered systems. Experimentally measured roughness exponents characterizing spatial fluctuations have been reported for magnetic thin films, with values generally different from those pred...

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Bibliographic Details
Published in:arXiv.org 2021-07
Main Authors: Albornoz, Lucas J, Guruciaga, Pamela C, Jeudy, Vincent, Curiale, Javier, Bustingorry, Sebastian
Format: Article
Language:English
Subjects:
Domain walls
Exponents
Magnetic thin films
Roughness
Thin films
Online Access:Get full text
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Summary:Domain-wall dynamics and spatial fluctuations are closely related to each other and to universal features of disordered systems. Experimentally measured roughness exponents characterizing spatial fluctuations have been reported for magnetic thin films, with values generally different from those predicted by the equilibrium, depinning and thermal reference states. Here, we study the roughness of domain walls in GdFeCo thin films over a large range of magnetic field and temperature. Our analysis is performed in the framework of a model considering length-scale crossovers between the reference states, which is shown to bridge the differences between experimental results and theoretical predictions. We also quantify for the first time the size of the depinning avalanches below the depinning field at finite temperatures.
ISSN:2331-8422
DOI:10.48550/arxiv.2104.05436