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Synthesis and magnetic characterization of MnAs nanoparticles via nanoparticle conversion

Wolff, M. F. H.; Gorlitz, D.; Nielsch, K.; Messing, Maria LU and Deppert, Knut LU (2011) In Nanotechnology 22(5).
Abstract
We report on the synthesis of ferromagnetic manganese arsenide (MnAs) nanoparticles via the conversion of primary Mn particles which are generated in an aerosol process in a spark discharge generator. After sintering and size selection in an aerosol setup, the particles are deposited on GaAs(100) B and Si(111) substrates. Subsequent conversion to MnAs particles takes place in an annealing process under a hydrogen atmosphere with an arsine background pressure. The magnetic properties are studied using a SQUID magnetometer. The annealed MnAs particles exhibit hexagonal facets and show anisotropic magnetic behaviour on GaAs(100) B substrates, whereas on Si(111) they remain spherical and show isotropic magnetic behaviour. Scanning transmission... (More)
We report on the synthesis of ferromagnetic manganese arsenide (MnAs) nanoparticles via the conversion of primary Mn particles which are generated in an aerosol process in a spark discharge generator. After sintering and size selection in an aerosol setup, the particles are deposited on GaAs(100) B and Si(111) substrates. Subsequent conversion to MnAs particles takes place in an annealing process under a hydrogen atmosphere with an arsine background pressure. The magnetic properties are studied using a SQUID magnetometer. The annealed MnAs particles exhibit hexagonal facets and show anisotropic magnetic behaviour on GaAs(100) B substrates, whereas on Si(111) they remain spherical and show isotropic magnetic behaviour. Scanning transmission electron microscopy studies are used to confirm the conversion from Mn to MnAs. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nanotechnology
volume
22
issue
5
publisher
IOP Publishing
external identifiers
  • wos:000285581600015
  • scopus:79251554370
ISSN
0957-4484
DOI
10.1088/0957-4484/22/5/055602
language
English
LU publication?
yes
id
ea2c8cf3-937d-4db6-b0d1-952a2d5753c2 (old id 1791076)
date added to LUP
2011-03-16 14:24:08
date last changed
2017-09-10 03:07:18
@article{ea2c8cf3-937d-4db6-b0d1-952a2d5753c2,
  abstract     = {We report on the synthesis of ferromagnetic manganese arsenide (MnAs) nanoparticles via the conversion of primary Mn particles which are generated in an aerosol process in a spark discharge generator. After sintering and size selection in an aerosol setup, the particles are deposited on GaAs(100) B and Si(111) substrates. Subsequent conversion to MnAs particles takes place in an annealing process under a hydrogen atmosphere with an arsine background pressure. The magnetic properties are studied using a SQUID magnetometer. The annealed MnAs particles exhibit hexagonal facets and show anisotropic magnetic behaviour on GaAs(100) B substrates, whereas on Si(111) they remain spherical and show isotropic magnetic behaviour. Scanning transmission electron microscopy studies are used to confirm the conversion from Mn to MnAs.},
  articleno    = {055602},
  author       = {Wolff, M. F. H. and Gorlitz, D. and Nielsch, K. and Messing, Maria and Deppert, Knut},
  issn         = {0957-4484},
  language     = {eng},
  number       = {5},
  publisher    = {IOP Publishing},
  series       = {Nanotechnology},
  title        = {Synthesis and magnetic characterization of MnAs nanoparticles via nanoparticle conversion},
  url          = {http://dx.doi.org/10.1088/0957-4484/22/5/055602},
  volume       = {22},
  year         = {2011},
}