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Published on: July 2, 2018
Vortex chirality in exchange-biased elliptical magnetic rings
W Jung1, F J Castaño, C A Ross
1Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Controlling vortex chirality in magnetic rings for data storage is challenging. This study presents a model and experimental validation for tailoring vortex chirality using applied field and exchange bias in elliptical magnetic rings.
Area of Science:
- Physics
- Materials Science
- Nanotechnology
Background:
- The flux-closed or vortex state in thin-film magnetic rings is a promising candidate for data storage.
- Controlling vortex chirality in these systems has been a significant challenge.
Purpose of the Study:
- To develop a predictive model for vortex chirality in elliptical magnetic rings.
- To experimentally validate the model's predictions.
Main Methods:
- Modeling the change in system energy with domain wall movement.
- Experimental measurements of vortex chirality in Co and Co/IrMn magnetic rings.
- Comparing experimental results with model predictions.
Main Results:
- The model accurately predicts vortex chirality based on applied field and exchange bias direction.
- Experimental measurements show excellent agreement with the model.
- Vortex circulation direction can be precisely controlled.
Conclusions:
- A reliable method for tailoring vortex chirality in elliptical magnetic rings has been established.
- This control enables the use of magnetic ring vortices as tunable data storage tokens.
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