Tunneling spectra of sputter-deposited CoFeB/MgO/CoFeB magnetic tunnel junctions showing giant tunneling magnetoresistance effect

Rie Matsumoto, Yusuke Hamada, Masaki Mizuguchi, Masashi Shiraishi, Hiroki Maehara, Koji Tsunekawa, David D. Djayaprawira, Naoki Watanabe, Yoshinari Kurosaki, Taro Nagahama, Akio Fukushima, Hitoshi Kubota, Shinji Yuasa, Yoshishige Suzuki

研究成果: Article

35 被引用数 (Scopus)

抄録

We measured differential tunneling conductance (dI/dV, d 2I/dV2) spectra of spin-valve-type magnetic tunnel junctions (MTJs) with a MgO(001) tunnel barrier layer and amorphous CoFeB ferromagnetic electrodes that show 315% magnetoresistance (MR) ratio at 4.3 K. The dI/dV spectra showed clear reduction in the conductance at around ±400 mV for a parallel magnetic configuration. Such anomalous spectra have never been observed for MTJs with an amorphous Al-O barrier. The d 2I/dV2 spectra showed several distinct peaks between 5 and 100 mV. Magnon excitations are assigned to an origin of those peaks and thought to be a dominant process to reduce MR at finite bias voltage.

本文言語English
ページ(範囲)611-615
ページ数5
ジャーナルSolid State Communications
136
11-12
DOI
出版ステータスPublished - 2005 12 1
外部発表はい

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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