As a diluted magnetic semiconductor (DMS), (Ga,Mn)As is a possible candidate for the realization of spintronics devices, due to its intrinsic compatibility with GaAs based electronics. The low Curie temperature still limits its use for practical devices. Despite the huge knowledge on GaAs surface, the (Ga,Mn)As surface is still not well understood and difficult to handle. Standard surface cleaning techniques have many drawbacks, mainly because thermal treatments changes crystal structure. We will compare the magnetic and spectroscopic properties of differently processed (Ga,Mn)As surfaces with X-ray photoemission (XPS), X-ray absorption (XAS) and X-ray magnetic circular dichroism (XMCD). Samples as-grown, chemically etched, Ar+sputtered and annealed in oxygen will be compared.

Surface treatments and magnetic properties of Ga1-xMnxAs thin films / F. Maccherozzi, G. Panaccione, G. Rossi, M. Hochstrasser, M. Sperl, M. Reinwald, G. Woltersdorf, W. Wegscheider, C.H. Back. - In: SURFACE SCIENCE. - ISSN 0039-6028. - 601:18(2007), pp. 4283-4287. ((Intervento presentato al 24. convegno European Conference on Surface Science (ECOSS-24) tenutosi a Paris nel 2006.

Surface treatments and magnetic properties of Ga1-xMnxAs thin films

G. Rossi;
2007

Abstract

As a diluted magnetic semiconductor (DMS), (Ga,Mn)As is a possible candidate for the realization of spintronics devices, due to its intrinsic compatibility with GaAs based electronics. The low Curie temperature still limits its use for practical devices. Despite the huge knowledge on GaAs surface, the (Ga,Mn)As surface is still not well understood and difficult to handle. Standard surface cleaning techniques have many drawbacks, mainly because thermal treatments changes crystal structure. We will compare the magnetic and spectroscopic properties of differently processed (Ga,Mn)As surfaces with X-ray photoemission (XPS), X-ray absorption (XAS) and X-ray magnetic circular dichroism (XMCD). Samples as-grown, chemically etched, Ar+sputtered and annealed in oxygen will be compared.
X-ray photoelectron spectroscopy; X-ray absorption spectroscopy; magnetic interfaces; (Ga,Mn)As
Settore FIS/03 - Fisica della Materia
2007
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/555034
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