TbFeCo perpendicular magnetic recording media deposited on nanohole arrays of porous alumina layer
TbFeCo perpendicular magnetic recording media deposited on nanohole arrays of porous alumina layer
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DOI：
10.1063/1.2165646
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发表时间：
2006-04-15
影响因子：
3.2
通讯作者：
Morisako, Akimitsu
中科院分区：
文献类型：
--
作者：
Rahman, M. Tofizur;Liu, Xiaoxi;Morisako, Akimitsu
研究了在玻璃基板上形成多孔阳极氧化氧化铝制备磁性纳米点阵列的非光刻方法。我们在10 ~ 30 V的阳极电压范围内对溅射铝膜进行了阳极氧化，发现纳米孔阵列的密度随着阳极氧化电压的降低而增加。另一方面，孔直径随阳极电压的降低而减小。然后通过溅射将TbFeCo沉积在该多孔阵列上，厚度约为20nm，随后覆盖5nm钨(W)以防止表面氧化。沉积在该多孔层上的TbFeCo表现出完全的垂直各向异性。矫顽力随阳极氧化电压和孔直径的减小而增大。在平均孔径约为15 nm的多孔阵列上沉积的TbFeCo的矫顽力为4.3 kOe。随着孔直径的减小，垂直比也有所提高。从矫顽力H-c的角依赖性可知，H-c随外加场角从垂直方向（易轴）到面内方向（硬轴）的减小而逐渐减小。这表明TbFeCo纳米点阵列的磁化反转是通过Stoner-Wohlfarth模型发生的。(C) 2006年美国物理研究所。
A nonlithographic fabrication method of magnetic nanodot array by using porous anodized alumina formed on a glass substrate is studied. We carried out anodic oxidation of a sputtered Al film at the anodic voltage in the range of 10-30 V, and found that the density of the nanohole arrays increased with the decrease in anodization voltage. On the other hand, hole diameter decreased with the decrease in anodic voltage. Then TbFeCo is deposited onto this porous array by sputtering with a thickness of around 20 nm and subsequently overcoated with 5 nm tungsten (W) for the protection from surface oxidation. The TbFeCo deposited on this porous layer shows complete perpendicular anisotropy. The coercivity increased with the decrease in anodization voltage as well as hole diameter. The coercivity of the TbFeCo deposited on the porous array with a mean hole diameter of around 15 nm is 4.3 kOe. The squareness ratio is also improved with the reduction of the hole diameter. From the angular dependence of coercivity, H-c, it is found that the H-c decreases gradually with the decrease of applied field angle from the perpendicular direction (easy axis) to in-plane direction (hard axis). This indicates that the magnetization reversal in the TbFeCo nanodot array occurs by Stoner-Wohlfarth model. (C) 2006 American Institute of Physics.