Nanoscale Imaging of High‐Field Magnetic Hysteresis in Meteoritic Metal Using X‐Ray Holography
Nanoscale Imaging of High‐Field Magnetic Hysteresis in Meteoritic Metal Using X‐Ray Holography
复制标题
使用 X 射线全息术对陨石金属中的高场磁滞进行纳米级成像
DOI：
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发表时间：
2020
影响因子：
3.5
通讯作者：
R. Harrison
中科院分区：
文献类型：
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作者：
R. Blukis;B. Pfau;C. Günther;P. Hessing;S. Eisebitt;J. Einsle;R. Harrison
陨石金属中稳定的古地磁信息由“云带”携带：约1-10 μm宽的区域，包含嵌入顺磁性反纹石基质中的铁磁四纹石岛。由于它们的小尺寸和高矫顽力（理论上高达~2.2 T），四钽铁矿岛具有非常稳定的剩磁。然而，这些特性也使得难以以必要的空间分辨率和施加的磁场对其磁状态进行成像。在这里，我们描述了X射线全息术的首次应用，以空间分辨率低至~40 nm的Tazewell IIICD陨石云区的磁结构成像，并在施加的磁场高达±1.1 T，足以从单个岛屿中提取高场磁滞数据。根据平行和垂直于混浊区约100 nm厚切片表面施加的磁场采集图像。广泛的分布观察到，包括可能超过最大应用领域的值。磁滞回线中的水平偏移表明，在室温单畴状态下，岛之间的相互作用场分布的半宽约为100 mT，与一阶反转曲线图非常匹配。结果表明，未来的模型剩磁收购在多云区应考虑到强相互作用，以提取定量估计的古磁场。
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.
影响因子：
--
作者：
A. Muxworthy;D. Heslop;G. Paterson;D. Michalk
通讯作者：
A. Muxworthy;D. Heslop;G. Paterson;D. Michalk
影响因子：
38.3
作者：
Buettner, Felix;Lemesh, Ivan;Beach, Geoffrey S. D.
通讯作者：
Beach, Geoffrey S. D.
影响因子：
19.6
作者：
Buettner, Felix;Moutafis, C.;Eisebitt, S.
通讯作者：
Eisebitt, S.