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Barkhausen Noise from Precessional Domain Wall Motion
Touko Herranen1, Lasse Laurson1,2
1Helsinki Institute of Physics, Department of Applied Physics, Aalto University, P.O. Box 11100, FI-00076 Aalto, Espoo, Finland.
Physical Review Letters
|April 6, 2019
Summary
Barkhausen noise in magnetic thin films results from domain wall movement. Bloch line dynamics within domain walls also exhibit crackling noise, contributing significantly to spin rotation.
Area of Science:
- Condensed matter physics
- Materials science
- Magnetism
Background:
- The Barkhausen effect in disordered ferromagnets, characterized by jerky domain wall dynamics, is a key example of crackling noise.
- Understanding domain wall behavior is crucial for magnetic device applications.
Purpose of the Study:
- To investigate Barkhausen noise in disordered Pt/Co/Pt thin films.
- To analyze the role of domain wall internal structure and Bloch lines in Barkhausen dynamics.
Main Methods:
- Full micromagnetic simulations were employed.
- Detailed analysis of domain wall internal structure and dynamics was performed.
Main Results:
- Barkhausen noise was observed in Pt/Co/Pt thin films due to precessional domain wall motion.
- Topological defects, Bloch lines, were found to nucleate, propagate, and annihilate within domain walls during Barkhausen jumps.
- In-plane Bloch line dynamics exhibited crackling noise and dominated spin rotation activity.
Conclusions:
- Bloch line dynamics are a significant source of crackling noise in magnetic thin films.
- The internal structure of domain walls plays a critical role in Barkhausen noise phenomena.
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