Observation of single-spin transport in an island-shaped CoFeB double magnetic tunnel junction prepared by magnetron sputtering

Thamrongsin Siripongsakul, Hiroshi Naganuma, Andras Kovacs, Amit Kohn, Mikihiko Oogane, Yasuo Ando

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The Co40Fe40B20(CFB)/MgO/CFB/MgO/CFB-based multilayer was prepared by conventional magnetron sputtering and utilised in the fabrication of double magnetic tunnel junctions (DMTJs) for which the middle CFB layers were island-shaped. By analysing the magnetic property of the CFB islands with Langevins equation, it was possible to identify their diameters of 7.6, 8.9 and 11.0 nm; accordingly submicron-scaled DMTJs were fabricated to investigate single-spin transport phenomena. The coulomb staircase and the oscillatory tunnel magnetoresistive (TMR) were able to be observed at 6 K, where the TMR ratio was enhanced up to 60%, which is the highest value ever achieved in this structure.

Original languageEnglish
Pages (from-to)310-319
Number of pages10
JournalPhilosophical Magazine
Volume96
Issue number4
DOIs
Publication statusPublished - 2016 Feb 1

Keywords

  • Magnetoresistance
  • coulomb staircase
  • double magnetic tunnel junction
  • island growth

ASJC Scopus subject areas

  • Condensed Matter Physics

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