NiFe2O4(111) ultrathin films (3–5 nm) have been grown by oxygen-assisted molecular beam epitaxy and integrated as effective spin-filter barriers. Structural and magnetic characterizations have been performed in order to investigate the presence of defects that could limit the spin filtering efficiency. These analyses have revealed the full strain relaxation of the layers with a cationic order in agreement with the inverse spinel structure but also the presence of antiphase boundaries. A spin-polarization up to +25% has been directly measured by the Meservey-Tedrow technique in Pt(111)/NiFe2O4(111)/γ-Al2O3(111)/Al tunnel junctions. The unexpected positive sign and relatively small value of the spin-polarization are discussed, in comparison with predictions and previous indirect tunnelling magnetoresistance measurements.
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5 May 2014
Research Article|
May 06 2014
Structure, magnetic ordering, and spin filtering efficiency of NiFe2O4(111) ultrathin films
S. Matzen;
S. Matzen
a)
1
CEA, IRAMIS
, SPCSI, F-91191 Gif-sur-Yvette, France
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J.-B. Moussy;
J.-B. Moussy
b)
1
CEA, IRAMIS
, SPCSI, F-91191 Gif-sur-Yvette, France
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P. Wei;
P. Wei
2Francis Bitter Magnet Laboratory,
Massachusetts Institute of Technology
, Cambridge, Massachusetts 02139, USA
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J. C. Cezar;
Ph. Sainctavit;
Ph. Sainctavit
5
IMPMC
, F-75015 Paris, France
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J. S. Moodera
J. S. Moodera
2Francis Bitter Magnet Laboratory,
Massachusetts Institute of Technology
, Cambridge, Massachusetts 02139, USA
6Physics Department,
Massachusetts Institute of Technology
, Cambridge, Massachusetts 02139, USA
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a)
Now at Univ. Paris 11, CNRS, UMR 8622, IEF, F-91405 Orsay, France.
b)
Author to whom correspondence should be addressed. Electronic mail: [email protected].
c)
Now at CNPEM/LNLS, Campinas, Brazil.
Appl. Phys. Lett. 104, 182404 (2014)
Article history
Received:
November 20 2013
Accepted:
April 07 2014
Citation
S. Matzen, J.-B. Moussy, P. Wei, C. Gatel, J. C. Cezar, M. A. Arrio, Ph. Sainctavit, J. S. Moodera; Structure, magnetic ordering, and spin filtering efficiency of NiFe2O4(111) ultrathin films. Appl. Phys. Lett. 5 May 2014; 104 (18): 182404. https://doi.org/10.1063/1.4871733
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