Spin-torque induced rf oscillation in magnetic tunnel junctions with an Fe-rich CoFeB free layer

Y. Masugata, S. Ishibashi, H. Tomita, T. Seki, T. Nozaki, Y. Suzuki, H. Kubota, A. Fukushima, S. Yuasa

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9 Citations (Scopus)

Abstract

A steady magnetization precession induced by spin-torque was studied in magnetic tunnel junctions with an Fe-rich CoFeB free layer under a perpendicular magnetic field. The Fe-rich CoFeB free layer showed a low critical current (Ic) for spin-torque induced switching. The low value of I c for the Fe-rich CoFeB free layer enabled us to observe the spin-torque induced rf oscillation even at a low dc bias current (I dc). The oscillation frequency increased with increasing I dc, indicating the out-of-plane precessional mode. Owing to the perpendicular magnetic anisotropy in the Fe-rich CoFeB free layer, the large relative angle between the free and pinned layers was achieved under the perpendicular magnetic field. The out-of-plane precession of the magnetization and the large relative angle resulted in the large rf output power of 175 nW.

Original languageEnglish
Article number012098
JournalJournal of Physics: Conference Series
Volume266
Issue number1
DOIs
Publication statusPublished - 2011
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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