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Magnetic domain coupling study in single-crystalline Fe/CoO bilayers
Summary
We studied magnetic coupling in iron (Fe) films on cobalt oxide (CoO). Uncompensated cobalt spins at the interface align with iron magnetization, impacting magnetic ordering.
Area of Science:
- Surface science
- Condensed matter physics
- Magnetism
Background:
- Epitaxial growth of magnetic thin films is crucial for spintronic devices.
- Understanding interfacial magnetic coupling is key to controlling magnetic properties.
- Cobalt oxide (CoO) exhibits antiferromagnetic ordering, influencing adjacent ferromagnetic layers.
Purpose of the Study:
- To investigate the magnetic domain coupling between epitaxial iron (Fe) layers and cobalt oxide (CoO) films.
- To characterize the interfacial magnetic interactions at the Fe/CoO interface.
- To explore the influence of Fe layer thickness on magnetic ordering and coupling.
Main Methods:
- Photoelectron Emission Microscopy (PEEM) was employed to image magnetic domains.
- X-ray Magnetic Circular Dichroism (XMCD) and X-ray Magnetic Linear Dichroism (XMLD) were used to probe magnetic states.
- Epitaxial wedge-shaped Fe layers were deposited on CoO/Ag(001) substrates.
Main Results:
- Ferromagnetic domains in Fe and antiferromagnetic domains in CoO were imaged below the CoO ordering temperature.
- Uncompensated Co spins at the Fe/CoO interface were observed via XMCD-PEEM.
- These interfacial Co spins were found to couple parallel to the Fe layer's magnetization.
- Enhanced CoO XMLD contrast was observed for Fe thicknesses below 2 ML, indicating a lack of magnetic long-range order in thin Fe films.
Conclusions:
- The study reveals a direct coupling between interfacial Co spins and Fe magnetization.
- The magnetic ordering of the Fe layer is influenced by the underlying CoO, especially at very thin film thicknesses.
- These findings provide insights into interfacial magnetism relevant for magnetic storage and spintronic applications.
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