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首页> 外文期刊>Physica status solidi, B. Basic research >The effect of the size distribution on the giant magnetoresistance in magnetic granular films
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The effect of the size distribution on the giant magnetoresistance in magnetic granular films

机译：尺寸分布对磁性颗粒膜中巨磁阻的影响

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摘要

In the present paper, assuming that there is a size distribution described by the log-normal function for the spherical granules in granular films, we take respectively the critical sizes D-1(T) and D-2(T) as phenomenological parameters at different temperatures distinguishing single-domain ferromagnetic granules from superparamagnetic granules and from multi-domain granules. Accordingly, magnetic granules can be divided into three categories: superparamagnetic, single-domain ferromagnetic and multi-domain ferromagnetic granules. In view of various contributions to the giant magnetoresistance (GMR) effect, the three kinds of granules are separated into two categories: first ferromagnetic granules (F-1, consisting of single-domain ferromagnetic granules), which play a key role in the GMR effect; and second ferromagnetic granules (F-2, including superparamagnetic and multi-domain granules), which play a secondary role in the GMR effect. We combine the effective medium theory with the two-channel conducting model to study the GMR effect of granular films in detail. As a result, our calculated results are qualitatively in agreement with experimental data, showing that the theoretical method is essentially applicable for magnetic granular composites. (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA. Weinheim.
机译：在本文中，假设粒状薄膜中球形颗粒存在对数正态函数描述的尺寸分布，我们分别以临界尺寸D-1（T）和D-2（T）作为现象学参数。不同的温度将单畴铁磁颗粒与超顺磁颗粒和多畴颗粒区分开。因此，磁性颗粒可分为三类：超顺磁性，单畴铁磁和多畴铁磁颗粒。鉴于对巨磁阻（GMR）效应的各种贡献，将这三种颗粒分为两类：第一类铁磁颗粒（F-1，由单畴铁磁颗粒组成），它们在GMR中起关键作用影响;第二种铁磁颗粒（F-2，包括超顺磁性和多畴颗粒），在GMR效应中起次要作用。我们将有效介质理论与两通道传导模型相结合，以详细研究颗粒状薄膜的GMR效应。结果，我们的计算结果在质量上与实验数据吻合，表明该理论方法基本上适用于磁性颗粒复合材料。 （C）2004 WILEY-VCH Verlag GmbH＆Co. KGaA。温海姆。

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