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

doi:10.1088/1742-6596/266/1/012098

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

Materials Development Division

Research output: Contribution to journal › Article › peer-review

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 (I_c) 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 language	English
Article number	012098
Journal	Journal of Physics: Conference Series
Volume	266
Issue number	1
DOIs	https://doi.org/10.1088/1742-6596/266/1/012098
Publication status	Published - 2011

ASJC Scopus subject areas

Physics and Astronomy(all)

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

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.",

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T1 - Spin-torque induced rf oscillation in magnetic tunnel junctions with an Fe-rich CoFeB free layer

AU - Masugata, Y.

AU - Ishibashi, S.

AU - Tomita, H.

AU - Seki, T.

AU - Nozaki, T.

AU - Suzuki, Y.

AU - Kubota, H.

AU - Fukushima, A.

AU - Yuasa, S.

PY - 2011

Y1 - 2011

N2 - 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.

AB - 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.

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