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Title: High tunneling magnetoresistance ratio in perpendicular magnetic tunnel junctions using Fe-based Heusler alloys

Heulser alloys Fe{sub 2}Cr{sub 1−x}Co{sub x}Si (FCCS) with different Co compositions x have been predicted to have high spin polarization. High perpendicular magnetic anisotropy (PMA) has been observed in ultra-thin FCCS films with magnetic anisotropy energy density up to 2.3 × 10{sup 6 }erg/cm{sup 3}. The perpendicular magnetic tunnel junctions (p-MTJs) using FCCS films with different Co compositions x as the bottom electrode have been fabricated and the post-annealing effects have been investigated in details. An attractive tunneling magnetoresistance ratio as high as 51.3% is achieved for p-MTJs using Fe{sub 2}CrSi (FCS) as the bottom electrode. The thermal stability Δ can be as high as 70 for 40 nm dimension devices using FCS, which is high enough to endure a retention time of over 10 years. Therefore, Heusler alloy FCS is a promising PMA candidate for p-MTJ application.
Authors:
 [1] ;  [2] ; ;  [3] ;  [1]
  1. Department of Electrical and Computer Engineering, National University of Singapore (Singapore)
  2. (Singapore)
  3. Data Storage Institute, Agency for Science, Technology and Research - A*STAR (Singapore)
Publication Date:
OSTI Identifier:
22493055
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 118; Journal Issue: 23; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANISOTROPY; ANNEALING; ELECTRODES; ENERGY DENSITY; FCC LATTICES; HEUSLER ALLOYS; IRON BASE ALLOYS; MAGNETIZATION; MAGNETORESISTANCE; SPIN ORIENTATION; STABILITY; THIN FILMS; TUNNEL JUNCTIONS