Nature of magnetic coupling between Mn ions in as-grown Ga${}_{1-x}$Mn${}_x$As studied by x-ray magnetic circular dichroism

Abstract

The magnetic properties of as-grown Ga${}_{1-x}$Mn${}_x$As have been investigated by the systematic measurements of temperature and magnetic field dependent soft x-ray magnetic circular dichroism (XMCD). The {\it intrinsic} XMCD intensity at high temperatures obeys the Curie-Weiss law, but residual spin magnetic moment appears already around 100 K, significantly above Curie temperature ($T_C$), suggesting that short-range ferromagnetic correlations are developed above $T_C$. The present results also suggest that antiferromagnetic interaction between the substitutional and interstitial Mn (Mn${}_{int}$) ions exists and that the amount of the Mn${}_{int}$ affects $T_C$.

arXiv comment4 pages, 4 figures

References in corpus (5)

• Spin interactions of interstitial Mn ions in ferromagnetic GaMnAs
• Characterization of Magnetic Components in the Diluted Magnetic Semiconductor Zn${}_{1-x}$Co${}_x$O by X-ray Magnetic Circular Dichroism
• Global versus Local Ferromagnetism in a Model for Diluted Magnetic Semiconductors Studied with Monte Carlo Techniques
• Interstitial Mn in (Ga,Mn)As: Binding energy and exchange coupling
• Soft x-ray magnetic circular dichroism study of weakly ferromagnetic Zn${}_{1-x}$V${}_x$O thin film

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