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介绍了颗粒磁记录介质发展现状，着重总结、分析了钡铁氧体超细粉末制备技术最新进展，包括溶胶－凝胶法、共沉淀法、微乳液法等最新合成方法。这些方法是合成粒径小于１００ｎｍ的钡铁氧体超微粉末的有效方法。
The development of granular magnetic recording media is introduced. The latest progress in the preparation of barium ferrite ultrafine powders is summarized. The latest synthesis methods such as sol - gel method, coprecipitation method and microemulsion method are summarized. These methods are effective methods for synthesizing ultrafine barium ferrite powders with particle sizes less than 100 nm.