Evidence for the intrinsic ferromagnetism of semiconductor (Ga,Cr)As revealed by magnetic circular dichroism

TL;DR

This study provides clear evidence that (Ga,Cr)As is an intrinsically ferromagnetic diluted magnetic semiconductor, confirmed through magnetic circular dichroism measurements showing characteristic hysteresis behavior.

Contribution

It offers the first systematic MCD analysis confirming the intrinsic ferromagnetism of (Ga,Cr)As epilayers grown by low-temperature molecular-beam epitaxy.

Findings

Demonstrates intrinsic ferromagnetism in (Ga,Cr)As

Shows hysteresis in magnetic circular dichroism measurements

Supports (Ga,Cr)As as a diluted magnetic semiconductor

Abstract

To clarify whether or not (Ga,Cr)As is an intrinsic diluted magnetic semiconductor, a systematic study of the magnetic circular dichroism (MCD) was carried out for a series of (Ga,Cr)As epilayers grown by the low-temperature molecular-beam epitaxy technique. The present work provides unambiguous evidence for the intrinsic ferromagnetism of the (Ga,Cr)As epilayers with all the necessary properties in accordance with that of a diluted magnetic semiconductor, especially the hysteresis characteristics, which is opened up in the magnetic field dependence of MCD.