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Title: Temperature dependent exchange bias training effect in single-crystalline BiFeO{sub 3}/Co bilayers

Single-crystalline BiFeO{sub 3} (BFO)/Co bilayers were prepared by combined pulsed laser deposition and magnetron sputtering on (001) SrTiO{sub 3} substrates. Exchange bias (EB) and accompanying training effect have been studied as a function of temperature (T) between 5 K and 300 K. A non-monotonic exchange field variation with sharp increase below 100 K has been observed. In the meanwhile, strong training effect was recorded when T < 100 K and it weakens monotonically with increasing T up to 300 K. These temperature dependent EB and training effect may be caused by the uncompensated spins in both the interfacial spin-glass (SG) phase at low temperature and the antiferromagnetic BFO layer at higher temperature. The low temperature EB training results can be well fitted by a modified Binek's model considering asymmetric changes of the pinning SG spins at the descending and the ascending branches.
Authors:
; ; ; ; ;  [1] ; ;  [2] ;  [3] ;  [1] ;  [4]
  1. National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093 (China)
  2. Department of Physics, Southeast University, Nanjing 211189 (China)
  3. School of Electronics Science and Engineering, Nanjing University, Nanjing 211193 (China)
  4. (China)
Publication Date:
OSTI Identifier:
22410043
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 17; 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; BISMUTH COMPOUNDS; ENERGY BEAM DEPOSITION; FERRITES; INTERFACES; LASER RADIATION; LAYERS; MONOCRYSTALS; PULSED IRRADIATION; SPIN; SPIN GLASS STATE; SPUTTERING; STRONTIUM TITANATES; SUBSTRATES; TEMPERATURE DEPENDENCE