Antiferromagnetic proximity effect in epitaxial CoO/NiO/MgO(001) systems
1Department of Physics, State Key Laboratory of Surface Physics and Collaborative Innovation Center of Advanced Microstructures, Fudan University, Shanghai 200433, People's Republic of China.
Scientific Reports
|March 3, 2016
Summary
Researchers explored the magnetic proximity effect in antiferromagnetic (AFM) bilayers, observing a spin reorientation in NiO and enhanced Néel temperature in CoO. This discovery offers new ways to tune AFM properties for spintronic devices.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Magnetic proximity effect is crucial for understanding magnetic systems.
- Antiferromagnets (AFMs) are key materials for antiferromagnetic spintronics.
- Studying AFM/AFM proximity effects is challenging due to spin detection difficulties.
Purpose of the Study:
- Investigate the magnetic proximity effect in CoO/NiO antiferromagnetic bilayers.
- Understand how NiO thickness and spin orientation influence CoO properties.
- Explore new methods for tuning AFM properties for spintronic applications.
Main Methods:
- Epitaxial growth of CoO/NiO/MgO(001) systems.
- X-ray linear dichroism measurements.
- Magneto-optical Kerr effect (MOKE) measurements.
Main Results:
- Observed a spin reorientation transition in NiO from in-plane to out-of-plane with increasing thickness.
- Identified vertical exchange spring spin alignment in thick NiO layers.
- Demonstrated significant enhancement of the CoO Néel temperature, dependent on NiO spin orientation.
- Attributed enhanced Néel temperature to varying exchange coupling at the AFM/AFM interface.
Conclusions:
- The magnetic proximity effect can effectively modify spin configuration and ordering temperatures in AFMs.
- Tuning AFM properties near room temperature is achievable through interfacial coupling.
- Results provide a new pathway for designing advanced antiferromagnetic spintronic devices.
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