Quantum oscillation of the tunneling conductance in fully epitaxial double barrier magnetic tunnel junctions

Tomohiro Nozaki, Nobuki Tezuka, K. Inomata

Research output: Contribution to journalArticlepeer-review

80 Citations (Scopus)

Abstract

We investigated spin-dependent tunneling conductance properties in fully epitaxial double MgO barrier magnetic tunnel junctions with layered nanoscale Fe islands as a middle layer. Clear oscillations of the tunneling conductance were observed as a function of the bias voltage. The oscillation, which depends on the middle layer thickness and the magnetization configuration, is interpreted by the modulation of tunneling conductance due to the spin-polarized quantum well states created in the middle Fe layer. This first observation of the quantum size effect in the fully epitaxial double barrier magnetic tunnel junction indicates great potential for the development of the spin-dependent resonant tunneling effect in coherent tunneling regime.

Original languageEnglish
Article number027208
JournalPhysical Review Letters
Volume96
Issue number2
DOIs
Publication statusPublished - 2006 Jan 20

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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