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All wurtzite (In,Ga)As-(Ga,Mn)As core-shell nanowires

Šiušys, Aloyzas; Sadowski, Janusz LU ; Sawicki, Maciej; Kret, Slawomir; Wojciechowski, Tomasz; Dluzewski, Piotr; Gas, Katarzyna; Szuszkiewicz, Wojciech; Kaminska, Agnieszka and Story, Tomasz (2014) In Nano Letters 14(8). p.4263-4272
Abstract
Structural and magnetic properties of (In,Ga)As-(Ga,Mn)As core−shell nanowires grown by molecular beam epitaxy on GaAs(111)B substrate with gold catalyst have been investigated. (In,Ga)As core nanowires were grown at high temperature (500 °C) whereas (Ga,Mn)As shells were

deposited on the {11̅00} side facets of the cores at much lower

temperature (220 °C). High-resolution transmission electron microscopy images and high spectral resolution Raman scattering data show that both the cores and the shells of the nanowires have wurtzite crystalline structure. Scanning and transmission electron microscopy observations show smooth (Ga,Mn)As shells containing 5% of Mn epitaxially deposited on (In,Ga)As cores containing about 10%... (More)
Structural and magnetic properties of (In,Ga)As-(Ga,Mn)As core−shell nanowires grown by molecular beam epitaxy on GaAs(111)B substrate with gold catalyst have been investigated. (In,Ga)As core nanowires were grown at high temperature (500 °C) whereas (Ga,Mn)As shells were

deposited on the {11̅00} side facets of the cores at much lower

temperature (220 °C). High-resolution transmission electron microscopy images and high spectral resolution Raman scattering data show that both the cores and the shells of the nanowires have wurtzite crystalline structure. Scanning and transmission electron microscopy observations show smooth (Ga,Mn)As shells containing 5% of Mn epitaxially deposited on (In,Ga)As cores containing about 10% of In without any misfit dislocations at the core−shell interface. With the In content in the (In,Ga)As cores larger than 5% the (In,Ga)As lattice

parameter is higher than that of (Ga,Mn)As and the shell is in the tensile strain state. Elaborated magnetic studies indicate the

presence of ferromagnetic coupling in (Ga,Mn)As shells at the temperatures in excess of 33 K. This coupling is maintained only

in separated mesoscopic volumes resulting in an overall superparamagnetic behavior which gets blocked below ∼17 K. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Magnetic semiconductor nanowires, spintronics, superparamagnetism, molecular beam epitaxy
in
Nano Letters
volume
14
issue
8
pages
4263 - 4272
publisher
The American Chemical Society
external identifiers
  • wos:000340446200011
  • scopus:84906085692
ISSN
1530-6992
DOI
10.1021/nl500896d
language
English
LU publication?
yes
id
29576efa-d5e3-4af0-aff7-c649345fedd2 (old id 4589369)
date added to LUP
2014-08-20 17:16:06
date last changed
2017-11-19 03:56:56
@article{29576efa-d5e3-4af0-aff7-c649345fedd2,
  abstract     = {Structural and magnetic properties of (In,Ga)As-(Ga,Mn)As core−shell nanowires grown by molecular beam epitaxy on GaAs(111)B substrate with gold catalyst have been investigated. (In,Ga)As core nanowires were grown at high temperature (500 °C) whereas (Ga,Mn)As shells were<br/><br>
deposited on the {11̅00} side facets of the cores at much lower<br/><br>
temperature (220 °C). High-resolution transmission electron microscopy images and high spectral resolution Raman scattering data show that both the cores and the shells of the nanowires have wurtzite crystalline structure. Scanning and transmission electron microscopy observations show smooth (Ga,Mn)As shells containing 5% of Mn epitaxially deposited on (In,Ga)As cores containing about 10% of In without any misfit dislocations at the core−shell interface. With the In content in the (In,Ga)As cores larger than 5% the (In,Ga)As lattice<br/><br>
parameter is higher than that of (Ga,Mn)As and the shell is in the tensile strain state. Elaborated magnetic studies indicate the<br/><br>
presence of ferromagnetic coupling in (Ga,Mn)As shells at the temperatures in excess of 33 K. This coupling is maintained only<br/><br>
in separated mesoscopic volumes resulting in an overall superparamagnetic behavior which gets blocked below ∼17 K.},
  author       = {Šiušys, Aloyzas and Sadowski, Janusz and Sawicki, Maciej and Kret, Slawomir and Wojciechowski, Tomasz and Dluzewski, Piotr and Gas, Katarzyna and Szuszkiewicz, Wojciech and Kaminska, Agnieszka and Story, Tomasz},
  issn         = {1530-6992},
  keyword      = {Magnetic semiconductor nanowires,spintronics,superparamagnetism,molecular beam epitaxy},
  language     = {eng},
  number       = {8},
  pages        = {4263--4272},
  publisher    = {The American Chemical Society},
  series       = {Nano Letters},
  title        = {All wurtzite (In,Ga)As-(Ga,Mn)As core-shell nanowires},
  url          = {http://dx.doi.org/10.1021/nl500896d},
  volume       = {14},
  year         = {2014},
}