Division of Nanomaterials & Chemistry Hefei National Laboratory for Physical Sciences at the Microscale Department of Chemistry University of Science and Technology of China Hefei 230026 China.
ChemistryOpen. 2020 May 20;9(5):588-592. doi: 10.1002/open.202000106. eCollection 2020 May.
Self-assembly generated materials induced by an external magnetic field have attracted considerable interest following the development of nanodevices. However, the fabrication of macroscopic and anisotropic magnetic films at the nanoscale remains a challenge. Here, anisotropic magnetic films are successfully prepared using a solution-based nanowire assembly strategy under a magnetic field. The assembly process is manipulated by changing the thickness of silica shell coated on the surface of magnetic nanowires. The anisotropic magnetic films show highly anisotropic magnetization under different angles of magnetic field and better magnetization properties than that of disordered magnetic films. The well-defined nanowire arrays enable magnetization anisotropic property which may be useful in the magnetic energy conversion technologies and biomedical sciences which lie far beyond those achievable with traditional magnetic materials.
在纳米器件发展的推动下，对外磁场诱导的自组装材料引起了人们的广泛关注。然而，在纳米尺度上制备宏观各向异性的磁性薄膜仍然是一个挑战。在这里，我们采用基于溶液的纳米线组装策略，在外磁场下成功制备了各向异性磁性薄膜。通过改变磁性纳米线表面包覆的二氧化硅壳的厚度来操纵组装过程。各向异性磁性薄膜在不同磁场角度下表现出高度各向异性的磁化强度，并且具有比无序磁性薄膜更好的磁化性能。这种具有良好定义的纳米线阵列可以实现磁化各向异性特性，这可能在磁能转换技术和生物医学科学领域有重要的应用，这些应用远远超出了传统磁性材料所能实现的范围。
