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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
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 | ||||||||
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| 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: |
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| 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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