Magnetism and Mn Clustering in (In,Mn)Sb Magnetic Semiconductors

Jindong Liu, Micah P. Hanson, John A. Peters, Bruce W. Wessels*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Previously, high-temperature ferromagnetism with a Curie temperature in excess of 400 K was reported in the magnetic semiconductor (In,Mn)Sb films grown by metal-organic vapor phase epitaxy (MOVPE). To determine the role of Mn distribution on its magnetic properties, the Mn 2p core-level X-ray photoelectron spectroscopy (XPS) of (In,Mn)Sb films was measured. For films grown on an InSb substrate, Mn composition is spatially inhomogeneous and its concentration increases with increasing deposition temperature. Spin-orbit splitting energy of the Mn 2p core-level was found to increase with increasing Mn concentration. From the dependence of the measured spin-orbit splitting energy on the Mn concentration, evidence of atomic-scale Mn cluster formation was observed. The measured magnetic moment per Mn atom decreases from 3.0 μB/Mn to 1.8 μB/Mn with increasing Mn concentration, which is attributed to atomic-scale clusters that are ferromagnetic or ferrimagnetic. This detailed investigation gives an insight into the Mn distribution, phase composition and origin of magnetism in MOVPE-grown (In,Mn)Sb magnetic thin films.

Original languageEnglish (US)
Pages (from-to)24159-24167
Number of pages9
JournalACS Applied Materials and Interfaces
Volume7
Issue number43
DOIs
StatePublished - Oct 8 2015

Keywords

  • InMnSb
  • MOVPE
  • Mn clusters
  • Mn electronic structure
  • XPS
  • ferromagnetism
  • magnetic semiconductors
  • spin-orbit splitting energy

ASJC Scopus subject areas

  • Materials Science(all)

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