| 磁性颗粒状合金中巨磁阻的唯象理论 |
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| 引用本文： | 杨文伟,宋为基.磁性颗粒状合金中巨磁阻的唯象理论[J].哈尔滨师范大学自然科学学报,2001,17(4):80-86. |
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| 作者姓名： | 杨文伟 宋为基 |
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| 作者单位： | 苏州大学
(杨文伟)，苏州大学(宋为基) |
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| 摘 要： | 1 IntroductionRecently,the magnetic granular concentration dependence of GMR in granular compositessuch as Co-Ag,Ni-Ag,Co-Cu granular films has been researched1- 4] .It was shown thatat acertain temperature the GMR effect increased as the magnetic granular concentration increasedand after reaching a maximum the GMR effect decreased with the further increase of theconcentration.Some theoretical work has studied the dependence of GMR on the granule size5- 7] ,and some papers have disc…
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| 关 键 词： | 磁性颗粒状合金 巨磁阻效应 唯象理论 铁磁材料 非均匀颗粒薄膜 |
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| Abstract.AAA[J].Natural Science Journal of Harbin Normal University,2001,17(4):80-86. |
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| Authors: | Abstract |
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| Abstract: | We combine effective medium theory(EMT) with the two-channel conducting model to study the magnetic granular concentration depen-dence of a giant magnetoresistance (GMR) in magnetic granular composites.The composite is composed of small magnetic granules (such as Co) embeddedin an immiscible nonmagnetic metallic matrix (such as Ag). We consider theinfluence of granule size and concentration respectively. Firstly,granules have adistribution in size,resulting in superparamagnetic (SPM) granuries and ferro-magnetic granules which have different contributions to conductance. Secondly,the effective surface scattering is changed with the changes of concentration.The calculated result of GMR is in agreement with theexperimental data. |
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| Keywords: | Giant magnetoresistance Spin - dependent scattering Super-paramgnetic Ferromagnetism Inhomogeneous granular films |
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