Spin-torque-driven vortex dynamics in a spin-valve pillar with a perpendicular polarizer

Spin-torque-driven vortex dynamics in a spin-valve pillar with a perpendicular polarizer
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具有垂直偏振器的自旋阀柱中的自旋扭矩驱动的涡流动力学

DOI:
10.1063/1.2822436
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发表时间:
2007-12
影响因子:
4
通讯作者:
Zhang, Zongzhi
Zhang, Zongzhi
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Liu, Yaowen;He, Huan;Zhang, Zongzhi

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采用微磁学模型研究了自旋阀柱中自旋力矩驱动的涡旋动力学,该柱包含一个垂直极化器和一个涡旋自由层。观察到两种由涡核运动引起的瞬态振荡。振荡被视为自旋力矩、陀螺力、吉尔伯特阻尼和恢复力之间的竞争,由广义Thiele方程控制[A. A. Thiele,J.Appl.Phys.45,377(1974)]。基频由旋向运动控制,而高频振荡由自旋力矩和退磁场的平衡触发。涡核的极性可以通过涡-反涡对的产生和湮灭过程来切换。
Spin-torque-driven vortex dynamics are studied by micromagnetic modeling in a spin-valve pillar which contains a perpendicular polarizer and a vortex free layer. Two kinds of transient oscillations mediated by the vortex-core motion are observed. The oscillations are treated as the competition among the spin torque, gyroforce, Gilbert damping, and the restoring force, governed by the generalized Thiele equation [A. A. Thiele, J. Appl. Phys. 45, 377 (1974)]. The fundamental frequency is dominated by the gyrotropic motion, while the high-frequency oscillation is triggered by the balance of the spin torque and demagnetizing field. The polarity of the vortex core can be switched through a vortex-antivortex pair creation and annihilation process.
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