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Spectroscopic and transport studies ofCoxFe1−x/MgO(001)-based magnetic tunnel junctions
Spectroscopic and transport studies ofCoxFe1−x/MgO(001)-based magnetic tunnel junctions
- Source :
- Physical Review B. 90
- Publication Year :
- 2014
- Publisher :
- American Physical Society (APS), 2014.
-
Abstract
- ${\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x}$ epitaxial layers were grown by molecular beam epitaxy and controlled using in situ characterization tools (electron diffraction, x-ray photoelectron, and Auger spectroscopies) in order to use these alloys in magnetic tunnel junctions. Thick films are shown to be BCC up to $x=70$%, whereas thin films grown on Fe(001) are BCC over the whole Co concentration range up to a critical thickness. Fe/Co intermixing is also examined in detail. The tunnel magnetoresistance and conductance of MgO-based magnetic tunnel junctions built with BCC ${\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x}$ electrodes show peculiar voltage dependencies. Their interpretation relies on spin- and symmetry-resolved photoemission measurements and ab initio calculations. The bulk and interfacial occupied states detected by photoemission are compared to the calculated ones. Experimental results and ab initio calculations are in good agreement. Finally, the experimental conductance curves are compared to the autoconvolution of the $\ensuremath{\Delta}1$ density of states in which both bulk and interface states are taken into account.
- Subjects :
- Materials science
Condensed matter physics
Order (ring theory)
Condensed Matter Physics
Epitaxy
Electronic, Optical and Magnetic Materials
Condensed Matter::Materials Science
Tunnel magnetoresistance
Electron diffraction
Ab initio quantum chemistry methods
Condensed Matter::Superconductivity
Density of states
Thin film
Molecular beam epitaxy
Subjects
Details
- ISSN :
- 1550235X and 10980121
- Volume :
- 90
- Database :
- OpenAIRE
- Journal :
- Physical Review B
- Accession number :
- edsair.doi...........767f9c586ae379ebe6ca24e406e480a1
- Full Text :
- https://doi.org/10.1103/physrevb.90.214406