All wurtzite (In,Ga)As-(Ga,Mn)As core-shell nanowires
(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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/4589369
- author
- Šiušys, Aloyzas ; Sadowski, Janusz LU ; Sawicki, Maciej ; Kret, Slawomir ; Wojciechowski, Tomasz ; Dluzewski, Piotr ; Gas, Katarzyna ; Szuszkiewicz, Wojciech ; Kaminska, Agnieszka and Story, Tomasz
- organization
- publishing date
- 2014
- 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 (ACS)
- external identifiers
-
- wos:000340446200011
- scopus:84906085692
- pmid:24971488
- 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
- 2016-04-01 14:29:51
- date last changed
- 2022-03-06 19:35:02
@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}},
keywords = {{Magnetic semiconductor nanowires; spintronics; superparamagnetism; molecular beam epitaxy}},
language = {{eng}},
number = {{8}},
pages = {{4263--4272}},
publisher = {{The American Chemical Society (ACS)}},
series = {{Nano Letters}},
title = {{All wurtzite (In,Ga)As-(Ga,Mn)As core-shell nanowires}},
url = {{http://dx.doi.org/10.1021/nl500896d}},
doi = {{10.1021/nl500896d}},
volume = {{14}},
year = {{2014}},
}