MAGNETIC-PROPERTIES OF FE DEPOSITED INTO ANODIC ALUMINUM-OXIDE PORES AS A FUNCTION OF PARTICLE-SIZE
MAGNETIC-PROPERTIES OF FE DEPOSITED INTO ANODIC ALUMINUM-OXIDE PORES AS A FUNCTION OF PARTICLE-SIZE
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DOI：
10.1063/1.349125
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发表时间：
1991-10-15
影响因子：
3.2
通讯作者：
MOSKOVITS, M
中科院分区：
文献类型：
--
作者：
ALMAWLAWI, D;COOMBS, N;MOSKOVITS, M
对沉积在化学加宽阳极氧化铝薄膜中的铁进行磁性和电子显微镜测量的结合使我们能够将这些材料的矫顽力与金属颗粒的尺寸联系起来。 发现矫顽力是高度各向异性的并且取决于金属颗粒的纵横比。 H(c) 对长宽比的函数依赖性符合 Jacobs 和 Bean [Phys. Rev. 100, 1060 (1955)]通过对称扇形磁化反转。 这可能是因为在我们的未退火样品中，金属沉积物由熔融单域颗粒的圆柱形组件组成。 发现阳极氧化物的化学溶解导致的孔径扩大与样品在酸浴中浸泡的时间呈二次方关系。
A combination of magnetic and electron microscopic measurements on iron deposited in chemically widened anodic aluminum oxide films has allowed us to relate the coercivity of these materials to the dimensions of the metal particles. The coercivity is found to be highly anisotropic and to depend on the aspect ratio of the metallic particles. The functional dependence of H(c) on the aspect ratio fits the expression reported by Jacobs and Bean [Phys. Rev. 100, 1060 (1955)] for magnetization reversal by symmetric fanning. This is likely due to the fact that in our unannealed samples the metal deposit consists of a cylindrical assembly of fused single-domain particles. Pore widening by chemical dissolution of the anodic oxide is found to depend quadratically on the time that the sample is soaked in the acid bath.