Tunnel magnetoresistance oscillations associated with Coulomb staircases in insulating granular systems

K. Yakushiji, S. Mitani, K. Takanashi, H. Fujimori

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Spin-dependent single-electron tunnelling phenomena have been investigated in current-perpendicular-to-plane geometry for insulating granular systems. The sample structure consists of a 7-12-nm-thick Co-Al-O granular film sandwiched by the top and bottom electrodes. A very thin Al-O layer has been added between the bottom electrode and the granular film as a bottleneck of conductance, leading to the successful observation of Coulomb staircases in the current-bias voltage I-Vb characteristics. The Vb dependence of tunnel magnetoresistance (TMR) shows clear oscillatory behaviour associated with the Coulomb staircase. The TMR oscillation is interpreted as a phenomenal characteristic of spin-dependent single-electron tunnelling.

Original languageEnglish
Pages (from-to)2422-2426
Number of pages5
JournalJournal of Physics D: Applied Physics
Volume35
Issue number19
DOIs
Publication statusPublished - 2002 Oct 7

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

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