对称性破缺纳米磁体中涡旋成核动力学
Dynamics of Vortex Nucleation in Nanomagnets with Broken Symmetry
摘要：
我们调查的基本过程中，支配亚100纳米介观磁体的涡旋成核动力学。我们专注于对称性破缺的结构- Pacman-like纳米磁体的形状-在其中，我们研究微磁行为都通过一个简单的模型和数值。我们表明，它是可能的，建立所需的涡旋手性和极性，通过只施加准静态面内磁场沿特定方向。我们确定的模式是非常强大的对外部磁场噪声的涡旋成核。这些涡旋成核模式在具有破缺旋转对称性的宽范围的亚100 nm磁体中是常见的。
英文摘要：
We investigate fundamental processes that govern dynamics of vortex nucleation in sub-100 nm mesoscopic magnets. We focus on a structure with broken symmetry - Pacman-like nanomagnet shape - in which we study micromagnetic behavior both by means of a simple model and numerically. We show that it is possible to establish desired vortex chirality and polarity by applying only quasi-static in-plane magnetic field along specific directions. We identify the modes of vortex nucleation that are very robust against external magnetic field noise. These vortex nucleation modes are common among wide range of sub-100 nm magnets with broken rotational symmetry.
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