Industry/University Cooperative Research Activity: Stability of Magnetic Dispersions

最广泛使用的信息存储介质是磁带和磁盘，它们是通过将磁性颗粒浆料作为薄膜涂层涂在基材上而制成的。通过新兴的垂直记录技术（磁偶极子垂直于磁盘或磁带表面而不是平行于磁盘或磁带表面），钡铁氧体的圆盘状颗粒有望大大提高比特密度。除了增加钻头密度外，钡铁氧体记录介质还具有更好的耐磨损和耐腐蚀性能。尽管有相当大的商业利益，但钡铁氧体的发展一直受到难以防止团聚的阻碍。用小角激光散射来测量絮凝的初始速率，以监测絮凝的程度作为时间的函数。

The most widely used media for information storage are magnetic tapes and disks which are manufactured by applying a slurry of magnetic particles as a thin film coating on a substrate. Disk- shaped particles of barium ferrite hold out the promise of greatly increased bit density through the emerging technology of perpendicular recording (where the magnetic dipole is oriented normal to instead of parallel to the surface of the disk or tape). Besides increased bit density, barium ferrite recording media have improved resistance to wear and corrosion. Despite considerable commercial interest, development of barium ferrtie media has been hampered by the difficulty of preventing agglomeration. The inital rates of flocculation will be measured using small-angle laser scattering to monitor the extent of flocculation as a function of time.