Spin-dependent tunneling between a soft ferromagnetic layer and hard magnetic nanosize particles

Koichiro Inomata, Hideo Ogiwara, Yoshiaki Saito, Keiichiro Yusu, Katsutaro Ichihara

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Spin-dependent tunneling has been investigated for ferromagnetic tunnel junctions with a new structure, which consists of a hard ferromagnetic insulating granular thin film sandwiched between two soft ferromagnetic layers, or soft ferromagnetic and non-ferromagnetic layers. The granular film, consisting of ferromagnetic Co80Pt20 nanosize particles embedded in a SiO2 matrix with 13 nm thickness, has a high coercive force. The film was prepared by co-sputtering of Co80Pt20 and SiO2 targets on a glass substrate with a Cr or a Co80Pt20/Fe underlayer as a bottom electrode. A ferromagnetic Co9Fe layer as a top electrode was deposited over the granular film to form cross pattern junctions of 0.01 mm2 junction area through a metal mask. The tunneling magnetoresistance up to 4.5% at RT was observed for a Co9Fe/Co80Pt20-SiO2/Co 80Pt20/Fe junction at a low field.

Original languageEnglish
Pages (from-to)L1380-L1383
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume36
Issue number10 SUPPL. B
DOIs
Publication statusPublished - 1997 Oct 15

Keywords

  • Ferromagnetic
  • Granular
  • Hard magnetic
  • Junction
  • MR
  • Tunnel

ASJC Scopus subject areas

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

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