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論文

Reduction of intrinsic critical current density under a magnetic field along the hard axis of a free layer in a magnetic tunnel junction

三浦 勝哉*; 菅野 量子*; 市村 雅彦*; 早川 純*; 池田 正二*; 大野 英男*; 前川 禎通

Physical Review B, 84(17), p.174434_1 - 174434_7, 2011/11

 被引用回数:1 パーセンタイル:6.07(Materials Science, Multidisciplinary)

We investigated the effect of a magnetic field along a hard in-plane axis $$H$$$$_{rm hard}$$ on a current-induced magnetization switching in magnetic tunnel junctions. Our recent findings suggest that the effect of $$H$$$$_{rm hard}$$ mainly appears in the dynamic properties due to the nonconservative force of the spin-transfer torque based on the Slonczewski's model. A simple stability analysis demonstrated that the tilt of the magnetization direction away from the easy axis caused by the presence of $$H$$$$_{rm hard}$$ induces an imbalance between the spin-transfer and damping torques and that applying a current achieves the further tilted stable state. Achievement of this stable state can be interpreted as the suppression of the effect of the effective demagnetization field. Therefore the major reduction in $$J$$$$_{rm c0}$$ is due to the suppression of H$$_d^{*}$$ caused by the presence of $$H$$$$_{rm hard}$$.

論文

Spin transfer torque in MTJs with synthetic ferrimagnetic layers by the Keldysh approach

市村 雅彦*; 濱田 智之*; 今村 裕志*; 高橋 三郎*; 前川 禎通

Journal of Applied Physics, 109(7), p.07C906_1 - 07C906_3, 2011/03

 被引用回数:4 パーセンタイル:20.9(Physics, Applied)

Based on the Keldysh Green's function method within the tight-binding model, the spin transfer torque is analyzed in a magnetic tunnel junction with a synthetic ferrimagnetic (SyF) free layer in the ballistic regime. The spin transfer torque exerted on the magnetizations of ferromagnetic bilayers in the SyF free layer tends to rotate the magnetizations in the same direction as a combined motion of the SyF free layer regardless of the bias direction. This rotation causes a reduction of the critical current for the magnetization switching of the SyF free layer which is consistent with experimental observations.

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