论文标题
通过自旋扭矩铁磁共振的铁磁纳米线的旋转转换效率：调和线形和线宽分析方法
Charge-to-spin conversion efficiency in ferromagnetic nanowires by spin torque ferromagnetic resonance: Reconciling lineshape and linewidth analysis methods
论文作者
论文摘要
旋转轨道扭矩对切换纳米结构的磁化方向，流动天空和激动人心的自旋波很感兴趣。确定其效率的标准方法是通过自旋扭矩铁磁共振（ST-FMR），该技术涉及分析共振线宽或线形。在微叠液上，这两种分析方法非常一致。在这里，我们在Permalloy（Ni $ _ {80} $ fe $ _ {20} $）纳米线上介绍了ST-FMR结果 - 宽度从$ 150 $到800 nm不等，这表明用于分析resonance LineWidth和LinesHape的标准模型可提供不同的结果；当使用线形方法时，纳米线的效率显着提高。提出了正确说明样本形状的ST-FMR模型，并在两种方法之间显示出更好的一致性。微磁模拟用于验证模型。这些结果以及提出的更准确的纳米线模型对于表征和优化纳米结构中的电荷到旋转转换效率至关重要。
Spin orbit torques are of great interest for switching the magnetization direction in nanostructures, moving skyrmions and exciting spin waves. The standard method of determining their efficiency is by spin torque ferromagnetic resonance (ST-FMR), a technique that involves analyzing the resonance linewidth or lineshape. On microstuctures these two analysis methods are quite consistent. Here we present ST-FMR results on permalloy (Ni$_{80}$Fe$_{20}$) nanowires -- with widths varying from $150$ to 800 nm -- that show that the standard model used to analyze the resonance linewidth and lineshape give different results; the efficiency appears greatly enhanced in nanowires when the lineshape method is used. A ST-FMR model that properly accounts for the sample shape is presented and shows much better consistency between the two methods. Micromagnetic simulations are used to verify the model. These results and the more accurate nanowire model presented are of importance for characterizing and optimizing charge-to-spin conversion efficiencies in nanostructures.
