专利申请范围:8条(略) 发明详细说明这是一项关于磁记录材料用磁性氧化铁制造方法的专利。本发明的目的旨在获得一种在有机物中分散性、定向率及填充密度等特性优良的针状四氧化三铁或三氧化二铁磁粉。目前磁记录材料广泛使用的磁性氧化铁粉末,一般是以亚 Patent application: 8 (omitted) Detailed Description This is a magnetic iron oxide magnetic recording material manufacturing method of the patent. The object of the present invention is to obtain acicular ferroferric oxide or ferrioxide magnetic powder excellent in characteristics such as dispersibility, orientation rate and packing density in organic substances. Currently magnetic recording material widely used magnetic iron oxide powder, usually in Asia