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Updated: Jun 1, 2026
13:58
Probing C84-embedded Si Substrate Using Scanning Probe Microscopy and Molecular Dynamics
Published on: September 28, 2016
Origin of step-like behavior in the Co/Si system
Archna Sagdeo1, Sanjay Rai, A K Srivastava
1Indus Synchrotrons Utilization Division, Raja Ramanna Center for Advanced Technology, Indore, India.
Summary
This study investigated cobalt-silicon-cobalt trilayers, finding that silicon layer thickness dictates cobalt silicide formation. Magnetization reversal in thicker silicon layers is independent, showing no antiferromagnetic coupling.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Understanding the interface properties of thin film multilayer systems is crucial for developing advanced magnetic devices.
- Cobalt-silicon interfaces are of interest for their potential magnetic and electronic applications.
Purpose of the Study:
- To systematically investigate the structure and interface properties of as-deposited Co/Si/Co trilayer systems.
- To correlate these structural characteristics with the magnetic properties of the system.
- To determine the influence of silicon layer thickness on cobalt silicide formation and magnetic coupling.
Main Methods:
- X-ray reflectivity (XRR) for structural analysis.
- Cross-sectional transmission electron microscopy (TEM) for interface imaging.
- X-ray emission spectroscopy (XES) for chemical state analysis.
- Magneto-optical Kerr effect (MOKE) and magnetoresistance (MR) measurements for magnetic characterization.
Main Results:
- Complete conversion of the silicon layer to cobalt silicide occurs for thicknesses < ~20 Å.
- For silicon thicknesses > 20 Å, both cobalt silicide and pure silicon layers coexist.
- Absence of antiferromagnetic coupling was observed between the cobalt layers.
- Double-step magnetization behavior in thicker silicon samples is attributed to independent magnetization reversal of ferromagnetic cobalt layers with different coercivities.
Conclusions:
- Silicon layer thickness is a critical parameter controlling cobalt silicide formation in Co/Si/Co trilayers.
- The magnetic behavior is dominated by independent ferromagnetic layers rather than interlayer coupling.
- These findings provide insights into the design and fabrication of magnetic nanostructures with tailored properties.
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