Large tunnel magnetoresistance in epitaxial oxide spin-filter tunnel junctions

Takayuki Harada, Isao Ohkubo, Mikk Lippmaa, Yasuaki Sakurai, Yuji Matsumoto, Shunsuke Muto, Hideomi Koinuma, Masaharu Oshima

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

A high-performance spin filter tunnel junction composed of an epitaxial oxide heterostructure is reported. By independently controlling the magnetic orientations of ferromagnetic tunnel barrier and electrode layers, a tunnel magnetoresistance ratio exceeding 120% is obtained purely by the spin filtering effect. A newly introduced spin filter material, Pr 0.8Ca 0.2Mn 1-yCo yO 3, is shown to be useful for building novel multibarrier spintronic tunnel devices due to its composition-controlled magnetic hardness.

Original languageEnglish
Pages (from-to)4471-4475
Number of pages5
JournalAdvanced Functional Materials
Volume22
Issue number21
DOIs
Publication statusPublished - 2012 Nov 7
Externally publishedYes

Keywords

  • epitaxy
  • magnetic coupling
  • magnetic tunnel junctions
  • oxide thin films
  • spintronics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Electrochemistry

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