# Segmental front line dynamics of randomly pinned ferroelastic domain walls

## TL;DR

This study investigates the motion of ferroelastic domain walls in LaAlO3 using dynamic mechanical analysis, revealing a crossover from stochastic to pinned domain wall behavior through susceptibility and waiting time distribution analyses.

## Contribution

It provides a detailed analysis of domain wall creep-to-relaxation dynamics, combining susceptibility measurements with waiting time distributions, and applies a scaling function to describe the crossover behavior.

## Key findings

- Power-law behavior of dynamic susceptibility
- Crossover from stochastic to pinned domain wall motion
- Scaling function effectively describes the transition

## Abstract

Dynamic mechanical analysis (DMA) measurements as a function of temperature, frequency, and dynamic force amplitude are used to perform a detailed study of the domain wall motion in LaAlO3. In previous DMA measurements Harrison et al.[Phys. Rev. B69,144101(2004)] found evidence for dynamic phase transitions of ferroelastic domain walls in LaAlO3. In the present work we focus on the creep-to-relaxation region of domain wall motion using two complementary methods. We determine, in addition to dynamic susceptibility data, waiting time distributions of strain jerks during slowly increasing stress. The present dynamic susceptibility data can be well fitted with a power law, where a crossover from stochastic DW motion to the pinned regime is well described using the scaling function of Fedorenko et al.[Phys. Rev. B70, 224104(2004)].