skip to main content

Title: Interfacial electronic transport phenomena in single crystalline Fe-MgO-Fe thin barrier junctions

Spin filtering effects in nano-pillars of Fe-MgO-Fe single crystalline magnetic tunnel junctions are explored with two different sample architectures and thin MgO barriers (thickness: 3–8 monolayers). The two architectures, with different growth and annealing conditions of the bottom electrode, allow tuning the quality of the bottom Fe/MgO interface. As a result, an interfacial resonance states (IRS) is observed or not depending on this interface quality. The IRS contribution, observed by spin polarized tunnel spectroscopy, is analyzed as a function of the MgO barrier thickness. Our experimental findings agree with theoretical predictions concerning the symmetry of the low energy (0.2 eV) interfacial resonance states: a mixture of Δ{sub 1}-like and Δ{sub 5}-like symmetries.
Authors:
 [1] ;  [2] ; ;  [3] ;  [3] ;  [4] ; ;  [5] ;  [3] ;  [6]
  1. Department of Physics, School of Physical, Chemical and Applied Sciences, Pondicherry University, R. V. Nagar, Kalapet, Pondicherry 605 014 (India)
  2. (France)
  3. Institut Jean Lamour, UMR 7198, CNRS-Université de Lorraine, BP 239, 54506 Vandoeuvre (France)
  4. (GREMAN), University François Rabelais, Parc de Grandmont, 37200 Tours (France)
  5. SPINTEC, UMR 8191 CEA/CNRS/UJF-Grenoble 1/Grenoble INP, INAC, 17 rue des Martyrs, F-38054 Grenoble Cedex (France)
  6. (Romania)
Publication Date:
OSTI Identifier:
22269204
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; IRON; MAGNESIUM OXIDES; MONOCRYSTALS; SPIN ORIENTATION; SUPERCONDUCTING JUNCTIONS; TUNNEL EFFECT