(華中科技大學(xué) 電子科學(xué)與技術(shù)系，武漢 430074)
摘 要: 采用微磁有限元方法對(duì)連續(xù)型和隔離型CoCrPt垂直磁化膜的磁化翻轉(zhuǎn)過(guò)程和矯頑力進(jìn)行研究。通過(guò)模擬兩種介質(zhì)磁化翻轉(zhuǎn)過(guò)程發(fā)現(xiàn)，連續(xù)型介質(zhì)中為一致磁化翻轉(zhuǎn)；而隔離型介質(zhì)為非一致翻轉(zhuǎn)，即在其磁疇發(fā)生完全翻轉(zhuǎn)前，介質(zhì)中出現(xiàn)一種有助于減小退磁場(chǎng)的垂直膜面向上和向下的磁疇交替分布的狀態(tài)。進(jìn)一步對(duì)相互交換能、磁晶各向異性能、塞曼能和退磁場(chǎng)能等微磁學(xué)能量進(jìn)行分析后發(fā)現(xiàn)，退磁場(chǎng)是決定薄膜矯頑力的主要因素。隔離型薄膜具有比連續(xù)型薄膜更小的退磁場(chǎng)，其具有更大的矯頑力，在高密度垂直記錄中具有很大的優(yōu)勢(shì)。
關(guān)鍵字: 隔離型薄膜；連續(xù)型薄膜；微磁學(xué)；矯頑力
（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
