Scaling laws of domain walls in magnetic nanowires

Scaling laws of domain walls in magnetic nanowires
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磁性纳米线中畴壁的缩放定律

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发表时间:
2006
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通讯作者:
K. Kühn
K. Kühn
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文献类型:
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作者:
K. Kühn

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本文研究了细导线中180度磁畴壁。它建立了能量作为半径r的函数的两种标度制度之间的交叉。对于小半径,可以通过在每个横截面上磁化恒定的横壁来实现最佳缩放。对于大的半径,涡壁产生最佳的尺度。此外,我们证明了对于R→0的能量最小化问题Γ-converges到一个局部的一维问题,其中能量由π‖∂xm‖L2(R) + π2‖my‖L2(R)给出。
This paper investigates magnetic 180 degree domain walls in thin wires. It establishes a crossover between two scaling regimes for the energy as a function of the radiusR. For small radii the optimal scaling can be realized by a transverse wall for which the magnetization is constant on each cross section. For large radii a vortex wall yields the optimal scaling. Moreover we show that for R → 0 the energy minimization problem Γ-converges to a local, one dimensional problem where the energy is given by π‖∂xm‖L2(R) + π2 ‖my‖L2(R).