Huge spin-polarization of L21-ordered Co2MnSi epitaxial heusler alloy film

Yuya Sakuraba, Jun Nakata, Mikihiko Oogane, Hitoshi Kubota, Yasuo Ando, Akimasa Sakuma, Terunobu Miyazaki

Research output: Contribution to journalArticle

177 Citations (Scopus)

Abstract

Magnetic tunnel junctions (MTJs) with a stacking structure of epitaxial Co2MnSi/Al-O barrier/poly-crystalline Co75Fe25 were fabricated using an ultrahigh vacuum sputtering system. The epitaxial Co2MnSi bottom electrode exhibited highly ordered L21 structure and very smooth surface morphology. Observed magnetoresistance (MR) ratios of 70% at room temperature (RT) and 159% at 2 K are the highest values to date for MTJs using a Heusler alloy electrode. A high spinpolarization of 0.89 at 2 K for Co2MnSi obtained from Julliere's model coincided with the half-metallic band structure that was predicted by theoretical calculations.

Original languageEnglish
Pages (from-to)L1100-L1102
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume44
Issue number33-36
DOIs
Publication statusPublished - 2005 Aug 26

Keywords

  • Half-metal
  • Heusler alloy
  • Magnetic tunnel junction
  • Spin-polarization
  • Tunnel magnetoresistance

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

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