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Perpendicular resistance and galvanomagnetic effect in metallic superlattices

金属超晶格中的垂直电阻和电磁效应

基本信息

批准号：
63540258
负责人：
SATO Hideyuki
金额：
$ 1.28万
依托单位：
Tokyo Metropolitan University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1990
项目状态：
已结题

项目摘要

1) On the temperature dependences of resistivity and Hall coefficient of small layer periodicity (LAMBDA) Cu/Ni superlattices, we first observed structures characteristic of the decrease of Curie temperature. We also found this system is one the family of the superlattices with giant magnetoresistance (up to 9.3% for LAMBDA=2.75nm).2) While the Cr thickness is varied from 1 monatomic layer to 6 ML, the Hall coefficient enhanced and has a peak of about 3 times of pure Ag value at 3 ML.3) For Au/Mn system, we observed an enhancement of Hall coefficient with decreasing temperature down to about 20K. Together with the negative magnetoresistance observed at low temperature, it suggests there is magnetic conduction electron scattering with two dimensional character. From the temperature dependence of Hall coefficient, Mn layer in Au (30) /Mu (60) is decided to be alpha 4 phase which could not be identified by the other methods.4) On Pd/Co sample with a perpendicular anisotropy, we first observed the squared hysteresis loop directly on the field dependence of Hall resistivity.5) In Fe/Cr system, we first observed the clear correlation between the negative magnetoresistance and the anomalous Hall effect.6) For the perpendicular resistivity measurement, we still have some problems. We, however, could use this method to decide whether the specular transmission or the specular reflection of conduction electrons at interfaces of Ag/Co multilayer is dominant. Form the extra resistivity measured in the perpendicular geometry, the specular transmission is judged to predominate in this system.

1)在小层周期（LAMBDA）Cu/Ni超晶格电阻率和霍尔系数随温度变化的研究中，我们首次观察到居里温度下降的结构特征。我们还发现该系统是巨磁电阻超晶格家族中的一员（λ =2.75nm时达到9.3%）。2）当Cr层厚度从1个原子层到6个原子层变化时，霍尔系数增大，在3个原子层处有一个峰值，约为纯Ag值的3倍。我们观察到霍尔系数随着温度降低到约20 K而增强。结合低温下观察到的负磁阻效应，说明存在具有二维特征的磁导电子散射。从霍尔系数的温度依赖性，确定了Au（30）/Mu（60）中Mn层为α 4相，这是用其它方法无法识别的。4）在具有垂直各向异性的Pd/Co样品上，我们首次直接观察到了与霍尔系数场依赖性有关的平方磁滞回线。5）在Fe/Cr系统中，我们首次观察到负磁电阻与反常霍尔效应之间的明显相关性。6）对于垂直电阻率测量，我们仍然存在一些问题。然而，我们可以用这种方法来决定是否镜面透射或镜面反射的导电电子在Ag/Co多层膜界面占主导地位。从垂直几何中测量的额外电阻率，判断镜面透射在该系统中占主导地位。