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Coercivity enhancement in exchange biased systems driven by interfacial magnetic frustration
Leighton1, Nogues, Jonsson-Akerman
1Physics Department 0319, University of California-San Diego, La Jolla, California 92093-0319, USA.
Physical Review Letters
|October 6, 2000
Summary
We found that magnetic frustration in MnF(2)/Fe bilayers significantly enhances coercivity. This effect is tunable and reproducible, offering new ways to control magnetic properties.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Magnetism
Background:
- Exchange bias in antiferromagnetic/ferromagnetic bilayers is crucial for spintronic devices.
- Understanding the interface effects is key to controlling magnetic properties.
- Magnetic frustration can lead to unique magnetic behaviors.
Purpose of the Study:
- To investigate the temperature and cooling field dependence of coercivity in MnF(2)/Fe bilayers.
- To explore the role of magnetic frustration at the interface on coercivity.
- To determine if coercivity can be reproducibly tuned.
Main Methods:
- Fabrication of MnF(2)/Fe bilayers.
- Measurement of magnetic hysteresis loops.
- Temperature-dependent and cooling field-dependent coercivity measurements.
Main Results:
- Observed a strong enhancement of coercivity under conditions of maximum antiferromagnetic frustration and zero net exchange bias.
- Coercivity was found to be proportional to the exchange coupling between MnF(2) and Fe layers.
- Demonstrated reproducible and repeatable tuning of coercivity within the same sample.
Conclusions:
- A frustrated interface effectively pins domain walls in the ferromagnet, leading to enhanced coercivity.
- The observed phenomenon offers a pathway for controllable magnetic property tuning.
- This study provides insights into interfacial magnetism and its impact on coercivity.
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