通过延时Kerr显微术对磁化涨落进行空间映射
Spatial mapping of magnetization fluctuations via time-lapse Kerr microscopy
AI总结：
结合宽场磁光Kerr显微术与延时分析方案，以高时空分辨率研究铁磁薄膜准平衡态下的磁化涨落，发现空间局域的噪声热点，为磁性材料准平衡噪声过程的空间分辨研究开辟道路。
摘要：
将宽场磁光Kerr显微术与延时分析方案相结合，能够以高空间和时间分辨率研究磁化涨落。我们在此使用该技术研究铁磁薄膜中的磁化涨落，该薄膜通过专门的场扫描协议制备成准平衡磁态。实验揭示了在准平衡态磁畴内，样品表面分布着空间局域的噪声热点。正如涨落-耗散定理所预期，噪声热点的空间密度在不同低磁场强度下非常相似。该测量方案由此为磁性材料中准平衡噪声过程的空间分辨研究开辟了道路。
英文摘要：
Combining wide-field magneto-optical Kerr microscopy with a time-lapse analysis scheme allows investigating magnetization fluctuations with high spatial as well as temporal resolution. We here use this technique to study magnetization fluctuations in a thin ferromagnetic film prepared into a quasi-equilibrium magnetic state via a dedicated field sweep protocol. Our experiments reveal spatially localized noise hotspots distributed across the sample surface within the magnetic domains in the quasi-equilibrium state. The spatial density of the noise hot spots is very similar at different low magnetic field strengths, as expected from the fluctuation-dissipation theorem. The measurement scheme thus opens the way for the spatially resolved investigation of quasi-equilibrium noise processes in magnetic materials.
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