Acid-anodized aluminum forms amorphous alumina with long and columnar nanopores with approximately hexagonal ordering ("alumite"). Excellent hexagonal ordering of these nanopores has been achieved by 24 hours of anodization, but with restricted domain size (2-4 /spl mu/m/sup 2/), which can be increased to 100 /spl mu/m/sup 2/ with longer anodization. We have deposited Fe in disordered pores and Co in ordered pores; we can control the average length and diameter of these nanowires, but there is still a distribution of nanowire lengths. Previously, we described Fe nanowires with diameters down to 11 nm in disordered pores. Here we focus on longer (770 nm) and shorter (64 nm) Co nanowires with diameters of 25 nm in ordered pores with 100 nm pore-to-pore separation. The longer wires have an easy axis out-of-plane, with squareness <0.9, coercivity=1900 Oe, and a fluctuation field of 5.3 Oe. The shorter wires are more isotropic, with lower coercivities (/spl ap/1300 Oe) and larger fluctuation fields /spl ap/8.4 Oe.
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机译：酸阳极氧化的铝形成具有长方体和圆柱状纳米孔的非晶态氧化铝，并具有近似六边形的顺序（“铝矾土”）。这些纳米孔的极好的六角形排列已通过24小时的阳极氧化处理实现，但畴尺寸受到限制（2-4 / spl mu / m / sup 2 /），可以增加到100 / spl mu / m / sup 2 /阳极氧化时间更长。我们将Fe沉积在无序孔中，将Co沉积在有序孔中。我们可以控制这些纳米线的平均长度和直径，但是纳米线的长度仍然存在分布。以前，我们描述了直径为11 nm的无序孔中的Fe纳米线。在这里，我们关注直径为25 nm的较长（770 nm）和较短（64 nm）的Co纳米线，它们在有序孔中的孔径为100 nm，孔与孔的间距为100 nm。较长的导线的轴易于平面外，矩形度<0.9，矫顽力= 1900 Oe，波动场为5.3 Oe。较短的导线更各向同性，具有较低的矫顽力（/ spl ap / 1300 Oe）和较大的波动场/ spl ap / 8.4 Oe。
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