NOVEL MAGNETORESISTANCE EFFECT IN LAYERED MAGNETIC-STRUCTURES - THEORY AND EXPERIMENT
NOVEL MAGNETORESISTANCE EFFECT IN LAYERED MAGNETIC-STRUCTURES - THEORY AND EXPERIMENT
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DOI：
10.1103/physrevb.42.8110
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发表时间：
1990-11-01
影响因子：
3.7
通讯作者：
ZINN, W
中科院分区：
文献类型：
--
作者：
BARNAS, J;FUSS, A;ZINN, W
本文从理论和实验两方面研究了铁磁-非磁性多层膜的磁电阻效应。理论方法使用玻尔兹曼方程与自旋相关的体散射和界面散射。我们发现，当铁磁薄膜的磁化强度从平行排列旋转到反平行排列时，电阻率增加。体和接口的贡献进行了研究，作为电子的平均自由程和膜厚度的函数，数值，我们表明，这两种效果产生特征不同的结果。实验上，我们研究了外延和多晶（Fe/Cr）n/Fe多层膜，n= 1，2和4。在该系统中，反平行排列是通过跨Cr夹层的Fe层之间的反铁磁耦合来实现的。我们还发现了大的磁阻效应在Co/Au/Co结构中的Co磁化的反平行排列，通过在两个Co膜中的不同的矫顽场获得。外延Fe/Cr结构的理论和实验结果的详细比较显示出良好的一致性。
We study magnetoresistivity in ferromagnetic-nonmagnetic multilayers both theoretically and experimentally. The theoretical approach uses a Boltzmann equation with spin-dependent bulk and interface scattering. We show that the resistivity increases when the magnetizations of the ferromagnetic films rotate from the parallel alignment to the antiparallel one. Bulk and interface contributions are studied numerically as a function of the electron mean free path and film thickness, and we show that these two effects produce characteristically different results. Experimentally we investigated both epitaxial and polycrystalline (Fe/Cr) n/Fe multilayers with n= 1, 2, and 4. In this system the antiparallel alignment is achieved by an antiferromagnetic coupling between the Fe layers across the Cr interlayer. We also found large magnetoresistance effects in Co/Au/Co structures where the antiparallel alignment of the Co magnetizations was obtained by different coercive fields in the two Co films. A detailed comparison of the theoretical and experimental results for epitaxial Fe/Cr structures shows good agreement.