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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Spin-transfer-driven oscillations of the magnetic quasi-vortex in a dot with crystalline cubic anisotropy
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Spin-transfer-driven oscillations of the magnetic quasi-vortex in a dot with crystalline cubic anisotropy

机译：具有晶立方各向异性的点的磁性准涡旋的旋转传递驱动的振荡

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摘要

We study the oscillatory magnetization dynamics of a vortex-containing nanodot driven by an out-of-plane polarized electric current. The dot is an ultra-thin structure (of a thickness up to the magnetostatic exchange length, a nanodisc) created from a material with strong crystalline cubic anisotropy. Therefore, it is in-plane ordered, with an effective four-fold anisotropy. Provided that the dot diameter is sufficiently large compared to the crystalline anisotropy exchange length, a vortex-centered texture that consists of four closure domains and pi/2 domain walls (DWs) is stable. We call such a texture a quasi-vortex. Under the out-of-plane polarized spin current, in a certain range of the current density, the quasi-vortex rotates without any displacement of its center or damage to its core via movement of the pi/2 DWs. The DW motion is accompanied by cyclic deformations and significant oscillations of the out-of-plane component of the magnetization. We discuss the potential of the quasi-vortex-containing dot to serve as a free layer of a spin-transfer oscillator and suggest that it shows promise for improving the efficiency and/or simplicity of signal conversion relative to the usual spin-transfer vortex oscillators with a soft-magnetic free layer.
机译：我们研究了由平面外偏振电流驱动的含涡的纳米型的振荡磁化动力学。该点是由具有强晶立方各向异性的材料产生的超薄结构（厚度直达磁化交换长度，纳米DISC）。因此，它是面内有序的，具有有效的四倍各向异性。如果与晶体各向异性交换长度相比，点直径足够大，则由四个闭合结构域和PI / 2畴壁（DWS）组成的涡旋为中心的纹理是稳定的。我们称之为纹理Aquasi-Vortex。在平面外偏振旋转电流下，在电流密度的一定范围内，准涡流在没有PI / 2 DWS的移动的情况下没有任何位移或损坏其核心。 DW运动伴随着磁化强化外平面分量的循环变形和显着振荡。我们讨论了含有准涡旋点的潜力作为自旋转移振荡器的自由层，并表明它显示了提高信号转换的效率和/或简单性相对于通常的旋转转移涡流振荡器的承诺用软磁层。

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