Boron composition dependence of spin-transfer switching in magnetic tunnel junctions with CoFeB free layers

Daisuke Watanabe, Mikihiko Oogane, Shigemi Mizukami, Yasuo Ando, Terunobu Miyazaki

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

We investigated tunnel magnetoresistance (TMR) and magnetization switching due to spin-transfer torque in CoFeB/MgO/CoFeB junctions having three different free layer compositions, (Co50Fe50)100-xB x (x = 20, 25, 30), and measured their magnetic properties, including magnetization (Ms) and Gilbert damping constant (α), which are theoretically predicted to contribute to the critical current density (J c0) for spin-transfer switching. We found that the Jc0 in the magnetic tunnel junctions (MTJs) with x = 30 became smaller than that in the MTJs with x = 20 despite having a lower TMR ratio and a larger α. We showed that the Jc0 for each composition tends to follow the theoretical relationship for the magnetic factor of the free layer.

Original languageEnglish
Article number013001
JournalJapanese journal of applied physics
Volume48
Issue number1
DOIs
Publication statusPublished - 2009 Jan 20

ASJC Scopus subject areas

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

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