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磁各向异性热电效应对自旋相关器件的影响
Influence of magnetic anisotropy thermoelectric effect on spin-dependent devices
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摘要: 在纳米点接触热电效应的实验中检测到“Г”形Ni线两端的温差电压在外磁场作用下有较大变化，确认了这是由Ni线的磁各向异性热电效应引起的，外磁场的作用总是在逆温度梯度的方向产生一个额外的电动势，它与磁场以及Ni线两端温度差之间有清晰的对应关系．实验结果提示，自旋相关效应器件的研究需要留意器件样品的磁性材料构形设计和测试方法，以避免混入额外的电磁信号，给实验结果带来误判．Abstract: While researching the thermoelectric effect of the nanocontact, we find that the thermoelectric voltage between both ends of the "Г"-shaped Ni wire changes significantly by applying an external magnetic field, which we attribute to the influence of magnetic anisotropy of Ni wire. The effect of the external magnetic field always produces an extra force whose direction goes against the tem- perature gradient. And the extra force clearly corresponds to the magnetic field and temperature difference between both ends of the Ni wire. These results suggest that during studying spin-dependent devices, the testing methods and the configuration of magnetic material need to be noticed seriously in order to avoid interfusing additional electromagnetic signals which may bring about a miscarriage of justice to the experimental results.
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