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Preparation of nano-structured perpendicular magnetic recording media using porous alumina

多孔氧化铝纳米结构垂直磁记录介质的制备

基本信息

批准号：
13650343
负责人：
SHIOMI Shigeru
金额：
$ 2.24万
依托单位：
Mie University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

Porous aluminum oxide layers or alumite layers were formed by anodic oxidizing high-purity aluminum sheets. The anodic oxidization in sulfuric acid solution resulted in the formation of micro pores 15 nm in diameter and 40 nm in center-to-center separation. First, we deposited cobalt-platinum alloy into the pores by pulse electroplating. The cobalt content increased with increasing pulse voltage. The squareness of perpendicular magnetization curve ranged from 0.6 to 0.7. We found that the squareness drastically increases to values exceeding 0.9 by applying platinum seed. The application of platinum seed also resulted in an increase in coercivity. The platinum seed was found to influence the crystallographic orientation of hcp cobalt-platinum alloy, enhancing the perpendicular anisotropy. Next, the effect of platinum seed on magnetic properties was compared with that of copper seed by depositing cobalt on them. The platinum seed enhanced the coercivity from 1.6 kOe without any seed to 2.5 kOe, while the copper seed increased it to 2.0 kOe. The squareness as high as 0.95 was attained using either of platinum or copper seed. The reason is not clear why the coercivity is more enhanced by the platinum seed than copper seed. Finally, we deposited iron-platinum alloy into the pores in order to investigate the feasibility of forming ordered equi-atomic iron-platinum alloy. The alloy composition deposited into the pores depended on bath composition and pulse voltage. Higher pulse voltages result in higher iron contents. The coercivity as well as squareness became higher with an increase in iron content. The films with nearly equi-atomic compositions were annealed in vacuum. Although the coercivity was enhanced by annealing, the formation of ordered iron-platinum alloy was not confirmed. More accurate analysis of alloy composition seems required to prepare alumite films containing equi-atomic iron-platinum alloy.

采用阳极氧化法在高纯铝片上形成多孔氧化铝层或氧化铝层。在硫酸溶液中进行阳极氧化，形成了直径为15 nm、中心间距为40 nm的微孔。首先，我们用脉冲电镀法在孔隙中沉积钴铂合金。钴含量随脉冲电压的增加而增加。垂直磁化曲线的矩形度范围为0.6 - 0.7。我们发现，通过应用铂籽晶，方形度急剧增加到超过0.9的值。铂晶种的应用也导致了结晶度的增加。铂籽晶影响了hcp钴铂合金的晶体取向，增强了垂直各向异性。接下来，通过在铂晶种和铜晶种上沉积钴来比较铂晶种和铜晶种对磁性能的影响。铂晶种使矫顽力从没有任何晶种的1.6kOe提高到2.5kOe，而铜晶种使其提高到2.0kOe。使用铂或铜籽晶可获得高达0.95的矩形度。为什么铂晶种比铜晶种更能提高介电常数的原因尚不清楚。最后，我们将铁铂合金沉积到孔隙中，以探讨形成有序等原子铁铂合金的可行性。沉积到孔中的合金成分取决于镀液成分和脉冲电压。较高的脉冲电压导致较高的铁含量。随着铁含量的增加，结晶度和方形度也变高。在真空中退火的薄膜与近等原子组成。虽然退火提高了铁铂合金的导电性，但没有证实有序铁铂合金的形成。为了制备含等原子铁铂合金的氧化铝膜，需要对合金成分进行更精确的分析。