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旋转波Brillouin在FeCo中的测量,使用虚拟成像的相位阵列光谱仪

Sophie Chagnon-Lessard, Michael Newburger, Michael Wolf

|April 12, 2025

概括

研究人员有效地捕获了旋波Brillouin光谱,使用了一种新型的虚拟图像相位阵列光谱仪. 这一进步使得磁设备的快速,高信号对噪声的表征和旋波传播成为可能.

科学领域:

凝聚物质物理学凝聚物质物理学
材料科学材料科学材料科学
频谱学是一种光谱学.

背景情况:

旋转波是磁性材料中的基本激发,对于开发先进的旋转电子设备至关重要.
布里卢恩光谱是探测自旋波的关键技术,但通常受到采集速度和信号噪声比的限制.
能有效地描述磁器件的特征,需要先进的光谱方法.

研究的目的:

通过使用虚拟成像阶段阵列 (VIPA) 光谱仪,首次有效采集自旋波布里卢恩光谱.
用于在Fe75Co25薄膜中以高光谱分辨率和信号与噪声比为特征的热激发的磁子.
评估基于VIPA的仪器仪表对于在磁性设备中成像自旋波传播的适用性.

主要方法:

使用了一种虚拟成像相位阵列 (VIPA) 谱仪,与以标准为基础的隙过器相结合.
在一个5纳米长的单晶Fe75Co25膜中获得了热激发的磁子的Brillouin光谱.
应用了从29到370mT的外部磁场,并绘制了非均场中的空间变化.

主要成果:

实现了高效的旋波Brillouin光谱采集,具有快速检测 (100毫秒) 和高信号噪声比 (>100在10秒).
在23mW的功率下获得0.45GHz的光谱分辨率.
估计Fe75Co25薄膜的有效磁化值为1.6 ± 0.1 MA/m.
生成了布里卢恩转移变化的2D地图,展示了空间成像能力.

结论:

基于VIPA的光谱仪可以高效和灵敏地获取旋波布里卢恩光谱.
这种技术为表征磁性材料和磁性设备提供了一个强大的工具.
VIPA仪器适用于复杂磁系统中旋波传播的实时成像.

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