具有动态偏振器的平面自旋转移装置
Planar spin-transfer device with a dynamic polarizer
摘要：
在平面纳米磁性器件中，通过大的易面磁各向异性，例如通过薄膜中的形状各向异性，磁化方向保持接近给定平面。在这种情况下，磁化有效地显示了面内动态，其描述仅需要一个角度。此外，即使对于小的吉尔伯特阻尼值，运动也可能变得过阻尼。我们推导了自旋转移力矩存在下的有效面内动力学方程。在过阻尼制度实现的简化允许研究系统与几个动态磁件（“自由层”）。观察到从具有静态偏振器的自旋转移装置到具有两个等效磁体的装置的过渡。当磁体之间的尺寸差小于临界值时，该装置不表现出切换，而是直接进入"风车"进动状态。
英文摘要：
In planar nano-magnetic devices magnetization direction is kept close to a given plane by the large easy-plane magnetic anisotropy, for example by the shape anisotropy in a thin film. In this case magnetization shows effectively in-plane dynamics with only one angle required for its description. Moreover, the motion can become overdamped even for small values of Gilbert damping. We derive the equations of effective in-plane dynamics in the presence of spin-transfer torques. The simplifications achieved in the overdamped regime allow to study systems with several dynamic magnetic pieces (``free layers''). A transition from a spin-transfer device with a static polarizer to a device with two equivalent magnets is observed. When the size difference between the magnets is less than critical, the device does not exhibit switching, but goes directly into the ``windmill'' precession state.
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