Manke I, Kardjilov N, Schäfer R, Hilger A, Strobl M, Dawson M, Grünzweig C, Behr G, Hentschel M, David C, Kupsch A, Lange A, Banhart J
Helmholtz Centre Berlin for Materials and Energy (HZB), Institute of Applied Materials, Berlin 14109, Germany.
Nat Commun. 2010 Nov 23;1:125. doi: 10.1038/ncomms1125.
Magnetic domains have been the subject of much scientific investigation since their theoretical existence was first postulated by P.-E. Weiss over a century ago. Up to now, the three-dimensional (3D) domain structure of bulk magnets has never been observed owing to the lack of appropriate experimental methods. Domain analysis in bulk matter thus remains one of the most challenging tasks in research on magnetic materials. All current domain observation methods are limited to studying surface domains or thin magnetic films. As the properties of magnetic materials are strongly affected by their domain structure, the development of a technique capable of investigating the shape, size and distribution of individual domains in three dimensions is of great importance. Here, we show that the novel technique of Talbot-Lau neutron tomography with inverted geometry enables direct imaging of the 3D network of magnetic domains within the bulk of FeSi crystals.
自从一个多世纪前P.-E. 魏斯首次假设磁畴的理论存在以来，磁畴一直是众多科学研究的主题。到目前为止，由于缺乏合适的实验方法，尚未观察到块状磁体的三维（3D）畴结构。因此，块状物质中的畴分析仍然是磁性材料研究中最具挑战性的任务之一。目前所有的畴观察方法都局限于研究表面畴或磁性薄膜。由于磁性材料的性能受到其畴结构的强烈影响，开发一种能够三维研究单个畴的形状、大小和分布的技术具有重要意义。在此，我们表明，具有反向几何结构的塔尔博特-劳中子断层扫描新技术能够直接成像FeSi晶体块体内部磁畴的三维网络。
