论文标题
软磁性圆柱纳米线中的磁化学调制的微磁学
Micromagnetics of magnetic chemical modulations in soft-magnetic cylindrical nanowires
论文作者
论文摘要
我们分析了由较低磁化强度的软磁性材料制成的圆柱纳米线中高磁化材料的简短纵向调制的微磁学，例如薄或粘膜，结合了磁显微镜，分析建模和微磁模拟。磁化不匹配会在调制过程中引起轴周围磁化的卷曲，以试图筛选界面磁性电荷。卷曲角度随调制长度而增加，直到达到平稳性，并且对特定长度尺度的几乎完全充电筛选〜$δ_\ mathrm {mod} $，大于两种材料中任何一个的偶极交换长度。卷发循环可以通过典型级级$ 10^{12} a/m^{2} $的电荷电流而产生的卷发循环，对于$ \ sim $ 100 nm的直径，并达到$δ__\ mathrm {modrm {mod} $的最大值。
We analyze the micromagnetics of short longitudinal modulations of a high-magnetization material in cylindrical nanowires made of a soft-magnetic material of lower magnetization such as permalloy, combining magnetic microscopy, analytical modeling, and micromagnetic simulations. The mismatch of magnetization induces curling of magnetization around the axis in the modulations, in an attempt to screen the interfacial magnetic charges. The curling angle increases with modulation length, until a plateau is reached with nearly full charge screening for a specific length scale~$Δ_\mathrm{mod}$, larger than the dipolar exchange length of any of the two materials. The curling circulation can be switched by the Oersted field arising from a charge current with typical magnitude $10^{12} A/m^{2}$ for a diameter of $\sim$100 nm, and reaching a maximum for $Δ_\mathrm{mod}$.
