Magnetic properties of granular-type FePt-MgO perpendicular recording media
Magnetic properties of granular-type FePt-MgO perpendicular recording media
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DOI：
10.1109/tmag.2004.830218
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发表时间：
2004-08
影响因子：
2.1
通讯作者：
Zhengang Zhang;Kyongha Kang;T. Suzuki
中科院分区：
文献类型：
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作者：
Zhengang Zhang;Kyongha Kang;T. Suzuki
通过对 FePt/MgO 多层薄膜进行退火，在玻璃基板上制备具有垂直磁各向异性的颗粒型 FePt 薄膜。单轴垂直磁各向异性常数 (K/sub u/) 和激活体积 (V/sup */) 是通过使用 Sharrock 定向磁粒组装公式将剩余矫顽力拟合为外加场等待时间的函数来获得的。由于 L1/sub 0/ 相 FePt 晶粒中化学有序性增强，K/sub u/ 随着退火温度和退火时间的增加而增加。 V/sup */ 随着退火时间的延长而减小，揭示了退火过程中 MgO 基体的 FePt 晶粒分离过程。通过修改初始FePt/MgO多层结构和退火条件，优化后的FePt-MgO薄膜表现出较高的K/sub u/和较小的V/sup */值。
Granular-type FePt films with perpendicular magnetic anisotropy are fabricated onto glass substrates by annealing FePt/MgO multilayer films. The uniaxial perpendicular magnetic anisotropy constant (K/sub u/) and the activation volume (V/sup */) are obtained by fitting the remanent coercivity as a function of the applied field waiting time using the Sharrock's formula for oriented magnetic grain assembly. K/sub u/ increases with annealing temperature and annealing time, as a result of the enhanced chemical ordering in L1/sub 0/ phase FePt grains. V/sup */ tends to decrease with annealing time revealing the FePt grain separation process by the MgO matrix with annealing. By modifying the initial FePt/MgO multilayer structure and annealing condition, the optimized FePt-MgO film shows a high K/sub u/ and a small V/sup */ value.