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Edge effects in vortex-based nanocontact oscillators

机译:基于涡流的纳米接触振荡器的边缘效应

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摘要

The Oersted field about a nanocontact on a thin film can nucleate vortex formation in the film, and spin torque will drive the vortex in large-amplitude gyrotropic motion about the nanocontact. In a system where the nanocontact is a center of symmetry, the Oersted field provides the restoring force toward the nanocontact center, and spin torque balances the dissipation force from damping to give a linear dependence of the gyrotropic frequency on nanocontact current. For the lower symmetry case when the nanocontact is placed close to the edge of a film there is a significant magnetostatic force repelling the vortex from the edge as well as a deformation of the vortex structure. Both effects combine to produce an anisotropic restoring force, which in turn result in the existence of a lower critical current for gyrotropic motion and a nonlinear dependence of the gyrotropic frequency on the nanocontact current.
机译:薄膜上的纳米接触的Oersted场可以使薄膜中的涡旋形成成核,并且自旋扭矩将驱动围绕纳米接触的大振幅回旋运动中的旋涡。在以纳米接触为对称中心的系统中,奥斯特场提供朝向纳米接触中心的恢复力,自旋扭矩平衡了来自阻尼的耗散力,从而使回旋频率对纳米接触电流具有线性依赖性。对于较低对称性的情况,当将纳米触点放置在靠近薄膜边缘的位置时,会产生很大的静磁力,从而使涡流从边缘排斥,并使涡流结构变形。两种作用结合在一起产生各向异性的恢复力,这又导致存在较低的回旋运动临界电流,并且回旋频率对纳米接触电流呈非线性依赖性。

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