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Related Experiment Video

Updated: Jun 3, 2026

Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering

Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering

Published on: November 5, 2018

Study of Mn interstitials in (Ga, Mn)As using high-resolution x-ray diffraction.

L Horák¹, Z Sobáň, V Holý

¹Faculty of Mathematics and Physics, Department of Electronic Structures, Charles University, Prague, Czech Republic. horak@karlov.mff.cuni.cz

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|March 15, 2011

Summary

We developed a new method to quantify manganese (Mn) ions in interstitial positions within (Ga, Mn)As. This technique precisely determines interstitial Mn concentration, crucial for understanding ferromagnetic properties.

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Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

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Last Updated: Jun 3, 2026

Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering

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Published on: November 5, 2018

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

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Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

Published on: December 3, 2013

Area of Science:

Materials Science
Solid-State Physics
Crystallography

Background:

Manganese (Mn) ions in Gallium Arsenide (Ga, Mn)As can occupy both substitutional and interstitial lattice sites.
The distribution of Mn ions significantly influences the material's magnetic properties, including its Curie temperature.
Accurate determination of interstitial Mn concentration is essential for controlling and understanding these magnetic behaviors.

Purpose of the Study:

To present a novel method for determining the concentration of Mn ions specifically in nonequivalent interstitial positions within the (Ga, Mn)As lattice.
To enable precise quantification of interstitial Mn, which is critical for its impact on ferromagnetic properties.

Main Methods:

Simultaneous fitting of multiple diffraction curves, including weak diffractions sensitive to Mn content, to a theoretical model.
Utilizing the dependence of the structure factor on Mn concentration at different lattice positions and for various diffractions.

Main Results:

Successfully determined the densities of Mn ions in specific interstitial positions within the (Ga, Mn)As lattice.
The developed method allows for the quantification of interstitial Mn, differentiating it from substitutional Mn.

Conclusions:

The presented method provides a reliable way to measure interstitial Mn concentration in (Ga, Mn)As.
This capability is vital for advancing the understanding and manipulation of ferromagnetic properties in diluted magnetic semiconductors.