Mn L3,2 X-ray Absorption Spectroscopy And Magnetic Circular Dichroism In Ferromagnetic (Ga,Mn)P

TL;DR

This study investigates the electronic and magnetic properties of ferromagnetic (Ga,Mn)P using X-ray absorption and magnetic circular dichroism, revealing significant spin polarization and similarities with (Ga,Mn)As, and effects of sulfur compensation.

Contribution

It provides the first detailed comparison of Mn L3,2 XAS and XMCD spectra in (Ga,Mn)P and (Ga,Mn)As, highlighting the role of hybridization and doping effects on spin polarization.

Findings

Large XMCD asymmetries indicate significant spin polarization.

Spectral shapes are similar between (Ga,Mn)P and (Ga,Mn)As.

Sulfur donors reduce Curie temperature and spin polarization.

Abstract

We have measured the X-ray absorption (XAS) and X-ray magnetic circular dichroism (XMCD) at the Mn L3,2 edges in ferromagnetic Ga1-xMnxP films for 0.018<x<0.042. Large XMCD asymmetries at the L3 edge indicate significant spin-polarization of the density of states at the Fermi energy. The spectral shapes of the XAS and XMCD are nearly identical with those for Ga1-xMnxAs indicating that the hybridization of Mn d states and anion p states is similar in the two materials. Finally, compensation with sulfur donors not only lowers the ferromagnetic Curie temperature but also reduces the spin polarization of the hole states.