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Domain walls in antiferromagnetically coupled multilayer films
Olav Hellwig1, Andreas Berger, Eric E Fullerton
1San Jose Research Center, Hitachi Global Storage Technologies, 650 Harry Road, San Jose, CA 95120, USA.
Physical Review Letters
|November 13, 2003
Summary
Researchers observed novel magnetic domain-wall structures in multilayer films. A phase transition was found, shifting from non-magnetic to ferromagnetic cores, driven by layer thickness and energy competition.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Magnetism
Background:
- Antiferromagnetic materials exhibit complex magnetic domain structures.
- Controlling domain-wall properties is crucial for spintronic applications.
- Perpendicular magnetic anisotropy in multilayer films presents unique domain behaviors.
Purpose of the Study:
- To experimentally investigate magnetic domain-wall structures in antiferromagnetically coupled multilayer films.
- To understand the phase transition mechanism of domain walls.
- To explore the influence of layer thickness on domain-wall characteristics.
Main Methods:
- Fabrication of multilayer films with perpendicular anisotropy.
- Experimental observation of magnetic domain-wall structures.
- Tuning layer thickness to modify magnetic properties.
Main Results:
- Observed domain walls with no net magnetic moment.
- Discovered a first-order phase transition to domain walls with ferromagnetic cores.
- Identified competition between dipolar and exchange energies as the transition driver.
- Tuned the transition via layer thickness control.
Conclusions:
- The observed domain-wall structures and phase transitions are tunable through layer thickness.
- These findings in synthetic antiferromagnets may apply to A-type antiferromagnets.
- Understanding these domain walls is key for advanced magnetic device development.