Ferromagnetic InMnSb multi-phase films study by aberration-corrected (scanning) transmission electron microscopy

Leonardo Lari; Stephen Lea; Caitlin Feeser; Bruce W. Wessels; Vlado K. Lazarov

doi:10.1063/1.3676202

Ferromagnetic InMnSb multi-phase films study by aberration-corrected (scanning) transmission electron microscopy

Leonardo Lari^*, Stephen Lea, Caitlin Feeser, Bruce W. Wessels, Vlado K. Lazarov

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

31 Scopus citations

Abstract

In this work we report a structural and compositional study of ferromagnetic In _0.78Mn _0.22Sb films correlated to the magnetic properties as determined by superconducting quantum interference device magnetometer. The epilayers grown by metalorganic vapor phase epitaxy on GaAs(001) substrates showed two active magnetic components with Curie temperatures of approximately 300 K and in excess of 570 K. Secondary phases driven by the high manganese concentration (10 at. ) were identified by high-resolution (scanning) transmission electron microscopy imaging and energy dispersive X-ray spectroscopy. Most of the Mn was found to be incorporated in metallic manganese nanoprecipitates surrounded by an InMnSb matrix with Mn at 1 at. concentration. The origin of the two Curie temperatures of the film is associated with the presence of three magnetic components: hexagonal MnSb nanoprecipitates, non-stoichiometric MnAsSb, and the InMnSb matrix.

Original language	English (US)
Article number	07C311
Journal	Journal of Applied Physics
Volume	111
Issue number	7
DOIs	https://doi.org/10.1063/1.3676202
State	Published - Apr 1 2012

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1063/1.3676202

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title = "Ferromagnetic InMnSb multi-phase films study by aberration-corrected (scanning) transmission electron microscopy",

abstract = "In this work we report a structural and compositional study of ferromagnetic In 0.78Mn 0.22Sb films correlated to the magnetic properties as determined by superconducting quantum interference device magnetometer. The epilayers grown by metalorganic vapor phase epitaxy on GaAs(001) substrates showed two active magnetic components with Curie temperatures of approximately 300 K and in excess of 570 K. Secondary phases driven by the high manganese concentration (10 at. ) were identified by high-resolution (scanning) transmission electron microscopy imaging and energy dispersive X-ray spectroscopy. Most of the Mn was found to be incorporated in metallic manganese nanoprecipitates surrounded by an InMnSb matrix with Mn at 1 at. concentration. The origin of the two Curie temperatures of the film is associated with the presence of three magnetic components: hexagonal MnSb nanoprecipitates, non-stoichiometric MnAsSb, and the InMnSb matrix.",

author = "Leonardo Lari and Stephen Lea and Caitlin Feeser and Wessels, {Bruce W.} and Lazarov, {Vlado K.}",

note = "Funding Information: This work was supported by the RAEng/EPSRC Fellowship grant and National Science Foundation (NSF) [DMR-0800479]. Copyright: Copyright 2012 Elsevier B.V., All rights reserved.",

year = "2012",

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doi = "10.1063/1.3676202",

language = "English (US)",

volume = "111",

journal = "Journal of Applied Physics",

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T1 - Ferromagnetic InMnSb multi-phase films study by aberration-corrected (scanning) transmission electron microscopy

AU - Lari, Leonardo

AU - Lea, Stephen

AU - Feeser, Caitlin

AU - Wessels, Bruce W.

AU - Lazarov, Vlado K.

PY - 2012/4/1

Y1 - 2012/4/1

N2 - In this work we report a structural and compositional study of ferromagnetic In 0.78Mn 0.22Sb films correlated to the magnetic properties as determined by superconducting quantum interference device magnetometer. The epilayers grown by metalorganic vapor phase epitaxy on GaAs(001) substrates showed two active magnetic components with Curie temperatures of approximately 300 K and in excess of 570 K. Secondary phases driven by the high manganese concentration (10 at. ) were identified by high-resolution (scanning) transmission electron microscopy imaging and energy dispersive X-ray spectroscopy. Most of the Mn was found to be incorporated in metallic manganese nanoprecipitates surrounded by an InMnSb matrix with Mn at 1 at. concentration. The origin of the two Curie temperatures of the film is associated with the presence of three magnetic components: hexagonal MnSb nanoprecipitates, non-stoichiometric MnAsSb, and the InMnSb matrix.

AB - In this work we report a structural and compositional study of ferromagnetic In 0.78Mn 0.22Sb films correlated to the magnetic properties as determined by superconducting quantum interference device magnetometer. The epilayers grown by metalorganic vapor phase epitaxy on GaAs(001) substrates showed two active magnetic components with Curie temperatures of approximately 300 K and in excess of 570 K. Secondary phases driven by the high manganese concentration (10 at. ) were identified by high-resolution (scanning) transmission electron microscopy imaging and energy dispersive X-ray spectroscopy. Most of the Mn was found to be incorporated in metallic manganese nanoprecipitates surrounded by an InMnSb matrix with Mn at 1 at. concentration. The origin of the two Curie temperatures of the film is associated with the presence of three magnetic components: hexagonal MnSb nanoprecipitates, non-stoichiometric MnAsSb, and the InMnSb matrix.

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Ferromagnetic InMnSb multi-phase films study by aberration-corrected (scanning) transmission electron microscopy

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