铁磁纳米环中的基态组态
Ground-state configurations in ferromagnetic nanotori
摘要：
研究了环形纳米磁体的磁化基态。明确计算了与铁磁，涡旋和洋葱状配置相关的能量。分析表明，旋涡似乎是最突出的这种状态，最小化的总能量在每个环面与内部半径$r\gtrsim10\,{\rm nm}$（坡莫合金）。对于$r\lesssim10\,{\rm nm}$，无论何时$R/\ell_{ex}\gtrsim1.5$（$R$是环面外半径，$\ell_{ex}$是交换长度），涡旋仍然是最有利的模式，无论何时$R/\ell_{ex}\lesssim1.5$，都被铁磁状态取代。
英文摘要：
Magnetization ground states are studied in toroidal nanomagnets. The energetics associated to the ferromagnetic, vortex and onion-like configurations are explicitly computed. The analysis reveals that the vortex appears to be the most prominent of such states, minimizing total energy in every torus with internal radius $r\gtrsim10\,{\rm nm}$ (for Permalloy). For $r\lesssim10\,{\rm nm}$ the vortex remains the most favorable pattern whenever $R/\ell_{ex}\gtrsim1.5$ ($R$ is the torus external radius and $\ell_{ex}$ is the exchange length), being substituted by the ferromagnetic state whenever $R/\ell_{ex}\lesssim1.5$.
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