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          Institute: MPI für Festkörperforschung     Collection: FKF Publikationen 2002     Display Documents



  history
ID: 7522.0, MPI für Festkörperforschung / FKF Publikationen 2002
Ferromagnetic GaMnAs/GaAs superlattices - MBE growth and magnetic properties
Authors:Sadowski, J.; Mathieu, R.; Svedlindh, P.; Karlsteen, M.; Kanski, J.; Fu, Y.; Domagala, J. T.; Szuszkiewicz, W.; Hennion, B.; Maude, D. K.; Airey, R.; Hill, G.
Language:English
Date of Publication (YYYY-MM-DD):2002
Title of Journal:Thin Solid Films
Volume:412
Issue / Number:1-2
Start Page:122
End Page:128
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:We have studied the magnetic properties of (GaMnAs)(m)(GaAs)(n)
superlattices with magnetic GaMnAs layers of thickness between
eight and 16 molecular layers (ML) (23-45 Angstrom), and with
non-magnetic GaAs spacers from 4 to 10 ML (11-28 Angstrom).
While previous reports state that GaMnAs layers thinner than 50
Angstrom are paramagnetic in the whole Mn composition range
achievable using MBE growth (up to 8% Mn), we have found that
short period superlattices exhibit a paramagnetic-to-
ferromagnetic phase transition with a transition temperature
which depends on both the thickness of the magnetic GaMnAs
layer and the non-magnetic GaAs spacer. The neutron scattering
experiments have shown that the magnetic layers in
superlattices are ferromagnetically coupled for both thin
(below 50 Angstrom) and thick (above 50 Angstrom) GaMnAs
layers. (C) 2002 Elsevier Science B.V. All rights reserved.
Free Keywords:ferromagnetic semiconductors; molecular beam epitaxy;
semiconductor superlattices
External Publication Status:published
Document Type:Article
Communicated by:Michaela Asen-Palmer
Affiliations:MPI für Festkörperforschung
External Affiliations:; Chalmers Univ Technol, Dept Expt Phys, SE-41296 Gothenburg, Sweden
; Univ Gothenburg, SE-41296 Gothenburg, Sweden
; Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland
; Univ Copenhagen, Oersted Lab, Copenhagen, Denmark
; Uppsala Univ, Dept Mat Sci, SE-75121 Uppsala, Sweden
; SE Saclay, Leon Brillouin Lab, F-91191 Gif Sur Yvette, France
; Grenoble High Magnet Field Lab, F-38042 Grenoble, France
; Univ Sheffield, Dept Elect & Elect Engn, Sheffield S1 3JD, S Yorkshire, England
Identifiers:ISI:000177263500019
ISSN:0040-6090
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