Spin-dependent tunneling spectroscopy in MgO-based double-barrier magnetic tunnel junctions


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Yu G. Q. , Kurt H. , Feng J. F. , Xu K., Coey J. M. D. , Han X. F.

JOURNAL OF APPLIED PHYSICS, cilt.111, 2012 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 111 Konu: 7
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1063/1.3677776
  • Dergi Adı: JOURNAL OF APPLIED PHYSICS

Özet

We investigated the dynamic conductance and inelastic electron tunneling spectroscopy in MgO-based double barrier magnetic tunnel junctions with Co50Fe50/Co40Fe40B20 hybrid free layers. The tunneling is coherent through the MgO (001) barriers but nonresonant, and the highest tunneling magnetoresistance reaches 260% at 2K. Based on the detailed discussion of the tunneling mechanisms, the double-barrier junctions investigated here can be considered as two single-barrier junctions in series. (C) 2012 American Institute of Physics. [doi:10.1063/1.3677776]