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Title: Structure, magnetic ordering, and spin filtering efficiency of NiFe{sub 2}O{sub 4}(111) ultrathin films

NiFe{sub 2}O{sub 4}(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)/NiFe{sub 2}O{sub 4}(111)/γ-Al{sub 2}O{sub 3}(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.
Authors:
;  [1] ;  [2] ;  [3] ;  [4] ; ;  [5] ;  [2] ;  [6]
  1. CEA, IRAMIS, SPCSI, F-91191 Gif-sur-Yvette (France)
  2. Francis Bitter Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
  3. CEMES-CNRS, F-31055 Toulouse (France)
  4. ESRF, F-38043 Grenoble (France)
  5. IMPMC, F-75015 Paris (France)
  6. (United States)
Publication Date:
OSTI Identifier:
22269197
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 18; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM OXIDES; MAGNETIZATION; MAGNETORESISTANCE; MOLECULAR BEAM EPITAXY; SPIN; SPIN ORIENTATION; SUPERCONDUCTING JUNCTIONS; THIN FILMS; TUNNEL EFFECT