Magnetic transport mechanism in double ferromagnetic tunnel junctions with two-dimensional ferromagnetic particles

Hiroaki Sukegawa, Atsufumi Hirohata, Shinich Nakamura, Nobuki Tezuka, Satoshi Sugimoto, Koichiro Inomata

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Magnetic transport properties of Co90Fe10/AlO x,/Co90Fe10/AlOx/Co 90Fe10 ferromagnetic double tunnel junctions have been investigated with respect to the thermal fluctuation. A middle Co 90Fe10 layer is discontinuous by forming Co 90Fe10 particles two-dimensionally, which shows superparamagnetic behavior above 80 K. The average diameter of the Co 90Fe10 particles is estimated to be 4.8-5.0 nm from both a magnetization curve at room temperature and temperature dependence of coercivities deduced from magnetoresistance curves. This finding agrees with the maximum diameter (5.2 nm) evaluated from cross-sectional transmission electron microscope images, revealing that the dominant electron transport process heavily depends on the largest particles.

Original languageEnglish
Pages (from-to)2679-2681
Number of pages3
JournalIEEE Transactions on Magnetics
Volume41
Issue number10
DOIs
Publication statusPublished - 2005 Oct 1

Keywords

  • Co-tunneling
  • Double tunnel junction
  • Nano-particles
  • Tunnel magnetoresistance

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Physics and Astronomy (miscellaneous)

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