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Atomic Scale Structural Characterization of Epitaxial (Cd,Cr)Te Magnetic Semiconductor
Bastien Bonef1, Hervé Boukari1, Adeline Grenier1
11University Grenoble Alpes,F-38000 Grenoble,France.
Summary
Cr-rich regions form in magnetic semiconductor Cd1-x Cr x Te layers, impacting electronic and magnetic properties for spintronics. Understanding this atomic structure is key to developing new applications.
Area of Science:
- Materials Science
- Solid State Physics
- Nanotechnology
Background:
- Understanding atomic structure is vital for magnetic semiconductor properties.
- Spintronic applications depend on precise control of electronic and magnetic behavior.
Purpose of the Study:
- To investigate the formation and characteristics of chromium (Cr)-rich regions in cadmium telluride (CdTe) layers.
- To correlate the atomic-scale Cr distribution with the magnetic properties of (Cd,Cr)Te.
Main Methods:
- Utilized energy-dispersive X-ray spectrometry (EDX) in scanning transmission electron microscopy.
- Employed atom probe tomography (APT) for atomic-scale compositional analysis.
- Performed statistical analysis on APT reconstructed volumes.
Main Results:
- Observed Cr-rich regions with sizes of 6-10 nm at x=0.034, evolving to ellipsoidal shapes at x=0.083.
- Demonstrated increased Cr aggregation with higher average Cr composition.
- Discussed magnetic properties within a framework of inhomogeneous materials.
Conclusions:
- Cr distribution significantly influences the electronic and magnetic properties of (Cd,Cr)Te.
- Accurate atomic-scale quantification of Cr distribution presents challenges for EDX and APT.
- Further research is needed to fully understand and control Cr aggregation for spintronic applications.
