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Updated: Jul 28, 2026

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Published on: June 28, 2018
Spiraling spin structure in an exchange-coupled antiferromagnetic layer
1Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, Maryland 21218, USA.
Researchers found a spiraling spin structure in antiferromagnetic manganese-iron (FeMn) layers within permalloy/FeMn/Co trilayers. The spin structure
Area of Science:
- Materials Science
- Condensed Matter Physics
- Spintronics
Background:
- Antiferromagnetic materials are crucial in spintronics for memory and logic devices.
- Understanding spin structures in antiferromagnets is key to controlling their magnetic properties.
Purpose of the Study:
- To investigate the presence and characteristics of spin structures in antiferromagnetic FeMn layers.
- To determine the relationship between FeMn layer thickness and spin structure behavior.
Main Methods:
- Fabrication of permalloy/FeMn/Co trilayer structures with varying FeMn thicknesses (t(AF)).
- Experimental observation and analysis of spin structures within the FeMn layers.
Main Results:
- Evidence of a spiraling spin structure was observed within the FeMn layers.
- For FeMn thicknesses below 90 Angstroms, the spiral turn angle (θ) showed a linear dependence on thickness: θ = (1.76°/Å)t(AF).
Conclusions:
- The study confirms the existence of a spiraling spin structure in thin antiferromagnetic FeMn layers.
- The observed linear relationship provides a quantitative understanding of spin structure formation in these trilayers, relevant for spintronic applications.
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