Properties of magnetic tunnel junctions with a MgO/CoFeB/Ta/CoFeB/MgO recording structure down to junction diameter of 11nm

H. Sato, E. C.I. Enobio, M. Yamanouchi, S. Ikeda, S. Fukami, S. Kanai, F. Matsukura, H. Ohno

Research output: Contribution to journalArticlepeer-review

174 Citations (Scopus)

Abstract

We investigate properties of perpendicular anisotropy magnetic tunnel junctions (MTJs) with a recording structure of MgO/CoFeB/Ta/CoFeB/MgO down to junction diameter (D) of 11nm from 56nm. Thermal stability factor (Δ) of MTJ with the structure starts to decrease at D=30nm. D dependence of Δ agrees well with that expected from magnetic properties of blanket film taking into account the change in demagnetizing factors of MTJs. Intrinsic critical current (IC0) reduces with decrease of D in the entire investigated D range. A ratio of Δ to IC0 shows continuous increase with decrease of D down to 11nm.

Original languageEnglish
Article number062403
JournalApplied Physics Letters
Volume105
Issue number6
DOIs
Publication statusPublished - 2014 Aug 11

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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