Theoretical studies on spin-dependent conductance in FePt/MgO/FePt(001) magnetic tunnel junctions

Yujiro Taniguchi, Yoshio Miura, Kazutaka Abe, Masafumi Shirai

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The spin-dependent transport properties of FePt/MgO/FePt(001) magnetic tunnel junctions have been investigated on the basis of firstprinciples electronic structure calculations. The totally symmetric Δ 1-band predominantly contributes to the tunneling conductance for both the majority and the minority-spin channels. In the parallel magnetization configuration, the tunneling conductance via the majority-spin channel shows almost the same values for the junctions with the Fe-and Pt-terminated interfaces. On the other hand, the tunneling conductance via the minority-spin channel for the Fe-terminated interface is two orders of magnitude smaller than that through the Pt-terminated interface. The tunneling magnetoresistance ratio evaluated for the junction with the Fe-terminated interface exceeds 380%, which is in contrast to about 70% for that with the Pt-terminated interface.

Original languageEnglish
Pages (from-to)2585-2588
Number of pages4
JournalIEEE Transactions on Magnetics
Volume44
Issue number11 PART 2
DOIs
Publication statusPublished - 2008 Nov

Keywords

  • First-principles calculation
  • L1-ordered alloy
  • Spintronics
  • Tunnel magnetoresistance

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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