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The effect of single crystalline substrates and ion-beam bombardment on exchange bias in nanocrystalline NiO/Ni80Fe20 bilayers

Journal Article


Abstract


  • Methods to modify the magnetic coercivity and exchange bias field of nanocrystalline antiferromagnetic/ferromagnetic NiO/Ni80Fe20 thin films were investigated for bilayers grown using ion-assisted deposition onto different single crystalline substrates. An enhanced coercivity was found at 298 K for the films deposited on single crystalline MgO (100) and Al2O3 (11-20) substrates. After field cooling the films to 50 K, the NiO/NiFe bilayer grown on Al2O3 (11-20) exhibited the largest exchange bias ( - 25 Oe). The second part of the study investigated ion-beam modification of the ferromagnetic surface prior to the deposition of the NiO layer. A range of ion-beam bombardment energies (VEH) were used to modify in situ the NiFe surface during the deposition of NiO/NiFe/SiO2 films. Cross-sectional transmission electron microscopy showed a systematic reduction in the thickness of the NiFe layers with increasing Ar+ bombardment energies attributed to etching of the surface. In addition, the bombardment procedure modified the magnetic exchange bias of the composite structure in both the as-prepared and field-cooled state.

UOW Authors


  •   Cortie, David
  •   Shueh, Chin (external author)
  •   Lai, Bing-Chang (external author)
  •   Pong, P W T. (external author)
  •   Van Lierop, Johan (external author)
  •   Klose, Frank (external author)
  •   Lin, Ko-Wei (external author)

Publication Date


  • 2014

Citation


  • Cortie, D. L., Shueh, C., Lai, B., Pong, P. W. T., Lierop, J. van., Klose, F. & Lin, K. (2014). The effect of single crystalline substrates and ion-beam bombardment on exchange bias in nanocrystalline NiO/Ni80Fe20 bilayers. IEEE Transactions on Magnetics, 50 (1), 2300904-1-2300904-4.

Scopus Eid


  • 2-s2.0-84904319212

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/999

Start Page


  • 2300904-1

End Page


  • 2300904-4

Volume


  • 50

Issue


  • 1

Place Of Publication


  • United States

Abstract


  • Methods to modify the magnetic coercivity and exchange bias field of nanocrystalline antiferromagnetic/ferromagnetic NiO/Ni80Fe20 thin films were investigated for bilayers grown using ion-assisted deposition onto different single crystalline substrates. An enhanced coercivity was found at 298 K for the films deposited on single crystalline MgO (100) and Al2O3 (11-20) substrates. After field cooling the films to 50 K, the NiO/NiFe bilayer grown on Al2O3 (11-20) exhibited the largest exchange bias ( - 25 Oe). The second part of the study investigated ion-beam modification of the ferromagnetic surface prior to the deposition of the NiO layer. A range of ion-beam bombardment energies (VEH) were used to modify in situ the NiFe surface during the deposition of NiO/NiFe/SiO2 films. Cross-sectional transmission electron microscopy showed a systematic reduction in the thickness of the NiFe layers with increasing Ar+ bombardment energies attributed to etching of the surface. In addition, the bombardment procedure modified the magnetic exchange bias of the composite structure in both the as-prepared and field-cooled state.

UOW Authors


  •   Cortie, David
  •   Shueh, Chin (external author)
  •   Lai, Bing-Chang (external author)
  •   Pong, P W T. (external author)
  •   Van Lierop, Johan (external author)
  •   Klose, Frank (external author)
  •   Lin, Ko-Wei (external author)

Publication Date


  • 2014

Citation


  • Cortie, D. L., Shueh, C., Lai, B., Pong, P. W. T., Lierop, J. van., Klose, F. & Lin, K. (2014). The effect of single crystalline substrates and ion-beam bombardment on exchange bias in nanocrystalline NiO/Ni80Fe20 bilayers. IEEE Transactions on Magnetics, 50 (1), 2300904-1-2300904-4.

Scopus Eid


  • 2-s2.0-84904319212

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/999

Start Page


  • 2300904-1

End Page


  • 2300904-4

Volume


  • 50

Issue


  • 1

Place Of Publication


  • United States