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Dynamic binding of driven interfaces in coupled ultrathin ferromagnetic layers
P J Metaxas1, R L Stamps, J-P Jamet
1School of Physics, M013, University of Western Australia, 35 Stirling Highway, Crawley WA 6009, Australia. metaxas@physics.uwa.edu.au
Physical Review Letters
|September 28, 2010
Summary
We show that two ferromagnetic layers can exhibit dynamic interface binding, where domain walls move together. This binding occurs under specific driving field conditions, revealing a new phenomenon in magnetic systems.
Area of Science:
- Physics
- Materials Science
- Condensed Matter Physics
Background:
- Ferromagnetic layers are crucial in magnetic storage technologies.
- Understanding domain wall dynamics is key to improving device performance.
- Coupled magnetic systems exhibit complex behaviors influenced by inter-layer interactions.
Purpose of the Study:
- To experimentally demonstrate and characterize dynamic interface binding in coupled ferromagnetic layers.
- To investigate the conditions under which domain walls in separate layers move collectively.
- To explore the velocity-field response of these bound states.
Main Methods:
- Experimental setup involving two coupled ferromagnetic layers.
- Application of a variable driving magnetic field (H).
- Observation and measurement of domain wall velocities in each layer.
- Utilizing a one-dimensional model for theoretical comparison.
Main Results:
- Demonstration of dynamic interface binding between domain walls in two ferromagnetic layers.
- Identification of two broad ranges of the driving field (H) where binding occurs.
- Observation of a common velocity for bound domain walls, despite different individual responses.
- Bound states exhibit unique velocity-field responses, particularly as H approaches zero.
Conclusions:
- Dynamic interface binding is a reproducible phenomenon in coupled ferromagnetic systems.
- The binding mechanism is linked to the proximity of isolated domain wall velocities.
- A one-dimensional model can effectively reproduce key features of the bound states, suggesting generality.
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