论文标题
使用单自旋传感器的纳米定位对频率旋转波的过滤和成像
Filtering and imaging of frequency-degenerate spin waves using nanopositioning of a single-spin sensor
论文作者
论文摘要
氮呈（NV）磁力测定法是一种用于成像磁性材料中自旋波的新技术。它通过其微波磁性流量场检测到自旋波，在自旋波长的尺度上衰减。在这里，我们使用对单个NV传感器的纳米级控制作为波长滤波器，以表征通过薄膜磁绝缘体中微带激发的频率定位自旋波。随着NV探针与磁铁接触，我们观察到热和微波驱动的自旋波的不一致混合物。通过缩回尖端，我们逐渐抑制小波长模式，直到从混合物中出现单个相干模式。尽管我们的一维微带几何形状，但处于低驱动力的接触量扫描出人意料地显示了二维自旋波散分散体的整个ISO频轮廓的占用。我们的距离纯过滤器在微波兴奋下在自旋波段占用方面发光，并为成像木污水和其他相干的自旋波模式打开了机会。
Nitrogen-vacancy (NV) magnetometry is a new technique for imaging spin waves in magnetic materials. It detects spin waves by their microwave magnetic stray fields, which decay evanescently on the scale of the spin-wavelength. Here, we use nanoscale control of a single-NV sensor as a wavelength filter to characterize frequency-degenerate spin waves excited by a microstrip in a thin-film magnetic insulator. With the NV-probe in contact with the magnet, we observe an incoherent mixture of thermal and microwave-driven spin waves. By retracting the tip, we progressively suppress the small-wavelength modes until a single coherent mode emerges from the mixture. In-contact scans at low drive power surprisingly show occupation of the entire iso-frequency contour of the two-dimensional spin-wave dispersion despite our one-dimensional microstrip geometry. Our distance-tunable filter sheds light on the spin-wave band occupation under microwave excitation and opens opportunities for imaging magnon condensates and other coherent spin-wave modes.
