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）关于小层周期性（LAMBDA）Cu/Ni超晶格的电阻率和霍尔系数的温度依赖性，我们首先观察到居里温度降低的结构特征。我们还发现该系统是具有巨磁阻的超晶格家族之一（对于 LAMBDA=2.75nm，高达 9.3%）。2) 当 Cr 厚度从 1 个单原子层变化到 6 ML 时，霍尔系数增强并具有在 3 ML 处，峰值约为纯 Ag 值的 3 倍。3) 对于 Au/Mn 系统，我们观察到霍尔系数随温度降低至约 20K 而增强。结合低温下观察到的负磁阻，表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来看，Au(30)/Mu(60)中的Mn层被确定为α4相，这是其他方法无法识别的。4)在具有垂直各向异性的Pd/Co样品上，我们首先观察到平方磁滞回线直接与霍尔电阻率的场依赖性相关。5) 在 Fe/Cr 系统中，我们首先观察到负磁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中，我们仍然存在一些问题。然而，我们可以使用这种方法来确定 Ag/Co 多层界面处传导电子的镜面透射或镜面反射是否占主导地位。根据在垂直几何结构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。