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Updated: May 28, 2025
09:49
In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx
Published on: May 13, 2020
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Influence of Interface Mixed Layer on Non-Collinear Exchange Coupling in V-Fe Multilayers
Agnieszka Ranecka1, Maria Pugaczowa-Michalska1, Lesław Smardz1
1Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland.
Materials (Basel, Switzerland)
|February 13, 2025
Summary
This study investigated V/Fe multilayers, revealing interface mixing and magnetic coupling. Hydrogen absorption reversibly modifies interlayer exchange coupling, offering insights into magnetic phenomena.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Surface Science
Background:
- Vanadium/Iron (V/Fe) multilayers are crucial in spintronics.
- Understanding interface properties and magnetic coupling is key for device performance.
Purpose of the Study:
- To investigate interface mixing in V/Fe multilayers using in-situ X-ray photoelectron spectroscopy (XPS).
- To analyze magnetic coupling constants (J1, J2, J3) and their dependence on spacer thickness.
- To explore the effect of hydrogen absorption on magnetic coupling.
Main Methods:
- Ultra-high vacuum (UHV) magnetron sputtering for V/Fe multilayer fabrication.
- In-situ XPS for interface mixing analysis.
- Magnetic hysteresis loop measurements to determine coupling constants.
- Hydrogen absorption experiments at room temperature and 1 bar.
Main Results:
- Estimated interface mixing layer thickness at ~0.8 nm.
- Identified significant contributions of higher-order magnetic exchange constants (J2 and J3) for thicker V spacers.
- Observed reversible changes in coupling constants (J1, J2, J3) upon hydrogen absorption.
Conclusions:
- The 'fluctuating thickness of the non-magnetic spacer' model explains biquadratic coupling (J2).
- The 'loose spins' model accounts for cubic coupling (J3).
- Hydrogen absorption offers a reversible method to tune interlayer exchange coupling in V/Fe multilayers.
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