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Title: Magnetic phase transitions in Ta/CoFeB/MgO multilayers

We study thin films and magnetic tunnel junction nanopillars based on Ta/Co{sub 20}Fe{sub 60}B{sub 20}/MgO multilayers by electrical transport and magnetometry measurements. These measurements suggest that an ultrathin magnetic oxide layer forms at the Co{sub 20}Fe{sub 60}B{sub 20}/MgO interface. At approximately 160 K, the oxide undergoes a phase transition from an insulating antiferromagnet at low temperatures to a conductive weak ferromagnet at high temperatures. This interfacial magnetic oxide is expected to have significant impact on the magnetic properties of CoFeB-based multilayers used in spin torque memories.
Authors:
; ; ; ;  [1] ;  [2] ;  [1] ;  [3] ; ;  [4] ;  [5] ;  [6]
  1. Physics and Astronomy, University of California, Irvine, California 92697 (United States)
  2. INAC/CEA, Grenoble, 17 Avenue des Martyrs, 38054 Grenoble (France)
  3. (Brazil)
  4. Fakultät für Physik and Center for Nanointegration (CeNIDE), Universität Duisburg-Essen, 47048 Duisburg (Germany)
  5. HGST Research Center, San Jose, California 95135 (United States)
  6. Components Research, Intel, Hillsboro, Oregon 97124 (United States)
Publication Date:
OSTI Identifier:
22399046
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 19; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANTIFERROMAGNETISM; APPROXIMATIONS; CARBON DIOXIDE; COBALT COMPOUNDS; FERROMAGNETISM; INTERFACES; IRON BORIDES; LAYERS; MAGNESIUM OXIDES; MAGNETIC PROPERTIES; PHASE TRANSFORMATIONS; SPIN; SUPERCONDUCTING JUNCTIONS; TANTALUM; THIN FILMS; TORQUE; TUNNEL EFFECT