Fabrication of Ferrite Nanodots by using Self-Assembled Nanostructural Underlayer and Their Application to Ultrahigh Density Magnetic Recording Media

在不使用传统光刻技术和图形掩模的情况下，研究了铁氧体纳米点的制备。通过溅射形成自组装的Au纳米点，并将其用作铁氧体薄膜的底层。随后，在Au纳米点上溅射了六方铁氧体SrFe12O19，得到了SrFe12O19/Au样品。得到了自组装的SrFe12O19纳米点。Au纳米点底层的形貌为SrFe12O19薄膜提供了模板，从而形成了自组装的SrFe12O19纳米点。另外，由于在Au纳米点上制备了SrFe_12O_19薄膜，使SrFe_12O_19的磁畴结构减小到纳米尺度。重要的是，虽然纳米点显示出纳米级的磁区，但在SrFe12O19纳米点中发现了足够的磁化强度。

The fabrication of ferrite nanodots was studied without the use of conventional lithographic techniques and patterning masks. Self-assembled Au nanodots were formed via sputtering and used as the underlayer for the ferrite film. Subsequently, hexagonal ferrite, SrFe_12O_19, was sputtered on the Au nanodots, resulting in an SrFe_12O_19/Au sample. Self-assembled SrFe_12O_19nanodots were obtained. The morphology of the Au nanodot underlayer acted as a template for the SrFe_12O_19 film, such that the self-assembled SrFe_12O_19 nanodots were formed. In addition, the fabrication of the SrFe_12O_19film on the Au nanodots induced the down-sizing ofthe magnetic domain structures of SrFe_12O_19 to the nanoscale. Importantly, although the nanodots showed nanometric magnetic domains, a sufficient magnetization magnitude in the SrFe_12O_19nanodots was revealed.