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Unconventional magnetisation texture in graphene/cobalt hybrids
Scientific Reports
|April 27, 2016
Summary
Graphene-covered cobalt films exhibit unique magnetic properties, including a gradual spin reorientation transition and a complex 3D spin texture. These findings differ significantly from pristine cobalt films.
Area of Science:
- Surface science
- Condensed matter physics
- Materials science
Background:
- Understanding magnetic properties of thin films is crucial for spintronics.
- Graphene's influence on interfacial magnetism is an active area of research.
- Cobalt thin films are widely studied for their magnetic characteristics.
Purpose of the Study:
- To investigate the magnetic domain structure of cobalt thin films at the graphene/Ir(111) interface.
- To explore the spin-dependent reflectivity and magnetic properties of these intercalated films.
- To understand the influence of graphene on the spin reorientation transition of cobalt.
Main Methods:
- Spin-polarized low-energy electron microscopy (SPLEEM) for vectorial imaging of magnetic domains.
- Spectroscopy measurements to analyze the electronic band structure.
- Systematic variation of cobalt film thickness.
Main Results:
- Graphene-covered cobalt films display distinct magnetic properties compared to pristine films.
- An unusually gradual thickness-dependent spin reorientation transition was observed, with magnetization rotating <10° per cobalt monolayer.
- A complex, three-dimensional, meandering spin texture was characterized during the transition.
- Spectroscopy suggests spin-independent unoccupied electronic states near the vacuum level.
Conclusions:
- Graphene significantly modifies the magnetic behavior of cobalt thin films.
- The observed gradual spin reorientation and complex spin texture offer new insights into surface magnetism.
- These findings could pave the way for novel applications in spintronic devices.
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