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Structure, magnetic ordering, and spin filtering efficiency of NiFe2O4(111) ultrathin films
- Source :
- Applied Physics Letters, Applied Physics Letters, American Institute of Physics, 2014, 104 (18), pp.182404. ⟨10.1063/1.4871733⟩, Applied Physics Letters, 2014, 104 (18), pp.182404. ⟨10.1063/1.4871733⟩
- Publication Year :
- 2014
- Publisher :
- HAL CCSD, 2014.
-
Abstract
- International audience; 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 þ25% has been directly measured by the Meservey-Tedrow technique in Pt(111)/NiFe2O4(111)/c-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
- Subjects :
- Materials science
Physics and Astronomy (miscellaneous)
Condensed matter physics
Magnetoresistance
Relaxation (NMR)
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
Magnetization
Tunnel effect
[PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph]
0103 physical sciences
[PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci]
Thin film
010306 general physics
0210 nano-technology
Quantum tunnelling
Molecular beam epitaxy
Spin-½
Subjects
Details
- Language :
- English
- ISSN :
- 00036951
- Database :
- OpenAIRE
- Journal :
- Applied Physics Letters, Applied Physics Letters, American Institute of Physics, 2014, 104 (18), pp.182404. ⟨10.1063/1.4871733⟩, Applied Physics Letters, 2014, 104 (18), pp.182404. ⟨10.1063/1.4871733⟩
- Accession number :
- edsair.doi.dedup.....242fdc3d11905f5aaaf16d65ce96af71