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


Creative Commons License

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

JOURNAL OF APPLIED PHYSICS, vol.111, no.7, 2012 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 111 Issue: 7
  • Publication Date: 2012
  • Doi Number: 10.1063/1.3677776
  • Title of Journal : JOURNAL OF APPLIED PHYSICS

Abstract

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]