(华中科技大学 电子科学与技术系，武汉 430074)
摘 要: 采用微磁有限元方法对连续型和隔离型CoCrPt垂直磁化膜的磁化翻转过程和矫顽力进行研究。通过模拟两种介质磁化翻转过程发现，连续型介质中为一致磁化翻转；而隔离型介质为非一致翻转，即在其磁畴发生完全翻转前，介质中出现一种有助于减小退磁场的垂直膜面向上和向下的磁畴交替分布的状态。进一步对相互交换能、磁晶各向异性能、塞曼能和退磁场能等微磁学能量进行分析后发现，退磁场是决定薄膜矫顽力的主要因素。隔离型薄膜具有比连续型薄膜更小的退磁场，其具有更大的矫顽力，在高密度垂直记录中具有很大的优势。
关键字: 隔离型薄膜；连续型薄膜；微磁学；矫顽力
（Department of Electronic Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China）
Abstract:The magnetization reversal processes and coercivities of the continuous and granular-type films were studied with fine element micromagnetic method. By simulating the magnetization reversal processes of two kinds of media, the magnetizations in continuous film and granular-type medium are coherent and incoherent, respectively, because the magnetization in film alternate up and down before the domains reversals. Further analysis of the exchange energies, magnetocrystalline anisotropy energies, Zeeman energies and demagnetizing energies show that the demagnetizing field is the main factor to decide the coercivity in medium. The granular-type film has a smaller demagnetizing field than the continuous film, thus it shows larger switching field and has great potential in high density perpendicular magnetic recording technology.
Key words: granular-type film; continuous film; micromagnetics; coercivity
