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Elevated curie temperature and half-metallicity in the ferromagnetic semiconductor LaxEu1−xO

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Monteiro, Pedro M. S., Baker, Peter J. (Peter James), Hine, Nicholas, Steinke, Nina-J., Ionescu, Adrian M., Cooper, Joshaniel F. K., Barnes, Crispin H. W., Kinane, Christian J., Salman, Zaher, Wildes, Andrew R., Prokscha, Thomas and Langridge, Sean (2015) Elevated curie temperature and half-metallicity in the ferromagnetic semiconductor LaxEu1−xO. Physical review B (Condensed matter and materials physics), Volume 92 (Number 4). doi:10.1103/PhysRevB.92.045202

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Official URL: http://dx.doi.org/10.1103/PhysRevB.92.045202

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Abstract

Here we study the effect of La doping in EuO thin films using SQUID magnetometry, muon spin rotation (µSR), polarized neutron reflectivity (PNR), and density functional theory (DFT). The µSR data shows that the La0.15Eu0.85O is homogeneously magnetically ordered up to its elevated TC. It is concluded that bound magnetic polaron behavior does not explain the increase in TC and an RKKY-like interaction is consistent with the µSR data. The estimation of the magnetic moment by DFT simulations concurs with the results obtained by PNR, showing a reduction of the magnetic moment per LaxEu1−xO for increasing lanthanum doping. This reduction of the magnetic moment is explained by the reduction of the number of Eu-4f electrons present in all the magnetic interactions in EuO films. Finally, we show that an upwards shift of the Fermi energy with La or Gd doping gives rise to half metallicity for doping levels as high as 3.2%.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Spintronics, Magnetic semiconductors
Journal or Publication Title: Physical review B (Condensed matter and materials physics)
Publisher: American Physical Society
ISSN: 1098-0121
Official Date: 9 July 2015
Dates:
DateEvent
9 July 2015Published
30 June 2015Accepted
22 May 2015Submitted
Volume: Volume 92
Number: Number 4
Number of Pages: 7
DOI: 10.1103/PhysRevB.92.045202
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: Engineering and Physical Sciences Research Council (EPSRC), Fundação para a Ciência e a Tecnologia (FCT), University of Cambridge. Department of Physics
Grant number: SFRH/BD/71756/2010 (FCT)

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