Element-resolved orbital polarization in III,MnAs ferromagnetic semiconductors from $K$ edge x-ray magnetic circular dichroism - Condensed Matter > Mesoscale and Nanoscale PhysicsReport as inadecuate




Element-resolved orbital polarization in III,MnAs ferromagnetic semiconductors from $K$ edge x-ray magnetic circular dichroism - Condensed Matter > Mesoscale and Nanoscale Physics - Download this document for free, or read online. Document in PDF available to download.

Abstract: Using x-ray magnetic circular dichroism XMCD, we determine theelement-specific character and polarization of unoccupied states near the Fermilevel in Ga,MnAs and In,Ga,MnAs thin films. The XMCD at the As K absorptionedge consists of a single peak located on the low-energy side of the edge,which increases with the concentration of ferromagnetic Mn moments. The XMCD atthe Mn K edge is more detailed and is strongly concentration-dependent, whichis interpreted as a signature of hole localization for low Mn doping. Theresults indicate a markedly different character of the polarized holes inlow-doped insulating and high-doped metallic films, with a transfer of the holeorbital magnetic moment from Mn to As sites on crossing the metal-insulatortransition.



Author: P. Wadley, A.A. Freeman, K.W. Edmonds, G. van der Laan, J.S. Chauhan, R.P. Campion, A.W. Rushforth, B.L. Gallagher, C.T. Foxon, F

Source: https://arxiv.org/







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