TY - JOUR
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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U2 - 10.1088/1742-6596/266/1/012098
DO - 10.1088/1742-6596/266/1/012098
M3 - Article
AN - SCOPUS:79952029271
VL - 266
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
SN - 1742-6588
IS - 1
M1 - 012098
ER -