Stable paleomagnetic information in meteoritic metal is carried by the “cloudy zone”: ~1–10 μm‐wide regions containing islands of ferromagnetic tetrataenite embedded in a paramagnetic antitaenite matrix. Due to their small size and high coercivity (theoretically up to ~2.2 T), the tetrataenite islands carry very stable magnetic remanence. However, these characteristics also make it difficult to image their magnetic state with the necessary spatial resolution and applied magnetic field. Here, we describe the first application of X‐ray holography to image the magnetic structure of the cloudy zone of the Tazewell IIICD meteorite with spatial resolution down to ~40 nm and in applied magnetic fields up to ±1.1 T, sufficient to extract high‐field hysteresis data from individual islands. Images were acquired as a function of magnetic field applied both parallel and perpendicular to the surface of a ~100 nm‐thick slice of the cloudy zone. Broad distributions of coercivity are observed, including values that likely exceed the maximum applied field. Horizontal offsets in the hysteresis loops indicate an interaction field distribution with half width of ~100 mT between the islands in their room temperature single‐domain state, providing a good match to first‐order reversal curve diagrams. The results suggest that future models of remanence acquisition in the cloudy zone should take account of strong interactions in order to extract quantitative estimates of the paleofield.

中文翻译：

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使用X射线全息术对流变金属中高磁场磁滞现象进行纳米成像。

气象金属中稳定的古磁信息由“多云区”携带：约1-10μm宽的区域包含嵌入顺磁性反胶体基质中的铁磁性四钙体岛。由于它们的体积小和矫顽力高（理论上高达约2.2 T），四方晶岛具有非常稳定的剩磁。然而，这些特性还使得难以以必要的空间分辨率和所施加的磁场来成像其磁性状态。在这里，我们描述了X射线全息术的首次应用，以成像Tazewell IIICD陨石的浑浊带的磁性结构，其空间分辨率低至〜40 nm，并且施加的磁场高达±1.1 T，足以提取出高来自各个岛的场磁滞数据。图像是根据平行于和垂直于多云区厚约100 nm的切片表面施加的磁场而获得的。观察到矫顽力分布广泛，包括可能超过最大施加场的值。磁滞回线中的水平偏移表示在室温单域状态下，岛之间的相互作用场分布的半宽度约为100 mT，这与一阶反转曲线图非常匹配。结果表明，未来在多云区获取剩余物的模型应考虑强相互作用，以便提取古场的定量估计值。包括可能超过最大应用字段的值。磁滞回线中的水平偏移表示在室温单域状态下，岛之间的相互作用场分布的半宽度约为100 mT，这与一阶反转曲线图非常匹配。结果表明，未来在多云区获取剩余物的模型应考虑强相互作用，以便提取古场的定量估计值。包括可能超过最大应用字段的值。磁滞回线中的水平偏移表示在室温单域状态下，岛之间的相互作用场分布的半宽度约为100 mT，这与一阶反转曲线图非常匹配。结果表明，未来在多云区获取剩余物的模型应考虑强相互作用，以便提取古场的定量估计值。