Two-dimensional antiferromagnetic ordering of the Mn/GaAs(001) interface

S. Colonna, V. Sessi, E. Placidi, F. Ronci, E. Jiménez, and F. Arciprete
Phys. Rev. B 99, 115311 – Published 18 March 2019

Abstract

In this paper we report on an x-ray absorption spectroscopy (XAS) and x-ray magnetic circular dichroism (XMCD) investigation of the Mn/GaAs(001) interface. The deposition of Mn in the submonolayer regime on the GaAs(001) surface at 390C induces a (2×1) reconstruction which evolves to a (2×2) by increasing the Mn amount. The combined information from XAS and XMCD indicates that the Mn atoms are located on surface sites possessing an almost square symmetry with a limited hybridization of the Mn electronic levels with the GaAs ones. The Mn atoms present a magnetic moment ranging between 4.9 and 4.2μB depending on the surface reconstruction. The Mn/GaAs(001) interface shows a paramagnetic behavior with an average magnetic moment which decreases by increasing the Mn amount. This variation of the surface magnetization is interpreted as an antiferromagnetic coupling of the Mn magnetic moments as the surface density of Mn atoms is increased. A further increase of the Mn amount after the (2×2) transition leads to the formation of Mn aggregates on the sample surface.

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  • Received 19 November 2018
  • Revised 23 January 2019

DOI:https://doi.org/10.1103/PhysRevB.99.115311

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

S. Colonna1,*, V. Sessi2,3, E. Placidi1,4, F. Ronci1, E. Jiménez5, and F. Arciprete1,4

  • 1Istituto di Struttura della Materia-CNR (ISM-CNR), Via Fosso del Cavaliere 100, I-00133 Roma, Italy
  • 2Chair of Nanoelectronics Materials, TU Dresden, 01062 Dresden, Germany
  • 3Center for Advancing Electronics Dresden, TU Dresden, 01187 Dresden, Germany
  • 4Dipartimento di Fisica, Università di Roma“Tor Vergata”, Via della Ricerca Scientifica 1, 00133 Roma, Italy
  • 5ESRF, Grenoble, France ESRF, European Synchrotron, F-38043 Grenoble, France

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Issue

Vol. 99, Iss. 11 — 15 March 2019

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