Correlation between symmetry-selective transport and spin-dependent resonant tunneling in fully epitaxial Cr/ultrathin-Fe/MgO/Fe(001) magnetic tunnel junctions

Tomohiko Niizeki, Hiroaki Sukegawa, Seiji Mitani, Nobuki Tezuka, Koichiro Inomata

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Spin-dependent resonant tunneling was investigated in fully epitaxial Cr(001)/ultrathin Fe(001)/MgO(001)/Fe(001) pseudo double-barrier magnetic tunnel junctions (MTJs) by varying structural coherence of the MgO barrier through postdeposition annealing and Mg layer insertion. It was clearly demonstrated that not only the flatness of the Fe quantum-well layer, but also the structural coherence of the MgO barrier caused the appearance of sharp resonant conductance peaks which were not obtained for spin-dependent resonant tunneling in amorphous AlO-barrier MTJs. The symmetry-selective transport via MgO barrier plays a crucial role for the resonant tunneling as well as large tunneling magnetoresistance.

Original languageEnglish
Article number182508
JournalApplied Physics Letters
Volume99
Issue number18
DOIs
Publication statusPublished - 2011 Oct 31

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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