Magneto-Seebeck tunneling on the atomic scale
Magneto-Seebeck tunneling on the atomic scale
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DOI：
10.1126/science.aat7234
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发表时间：
2019-03-08
期刊：
影响因子：
56.9
通讯作者：
Krause, Stefan
中科院分区：
文献类型：
--
作者：
Friesen, Cody;Osterhage, Hermann;Krause, Stefan
自旋极化电子在温度梯度驱动下穿过磁性隧道结的隧穿过程是热控制电子自旋输运的基本过程。我们实验研究了原子尺度的细节，这magnetoSeebeck隧道通过放置一个磁性探针尖端在低温下的磁性样品附近，与真空作为隧道势垒。加热的尖端和测量的结的热电势，同时扫描整个样品的自旋纹理导致自旋分辨的塞贝克系数，可以映射在原子尺度的横向分辨率。我们提出了一种自旋探测器的自旋电子学应用，这是完全由废热驱动，使用磁塞贝克隧道自旋信息转换成电压，可用于进一步的数据处理。
The tunneling of spin-polarized electrons across a magnetic tunnel junction driven by a temperature gradient is a fundamental process for the thermal control of electron spin transport. We experimentally investigated the atomic-scale details of this magnetoSeebeck tunneling by placing a magnetic probe tip in close proximity to a magnetic sample at cryogenic temperature, with a vacuum as the tunneling barrier. Heating the tip and measuring the thermopower of the junction while scanning across the spin texture of the sample lead to spin-resolved Seebeck coefficients that can be mapped at atomic-scale lateral resolution. We propose a spin detector for spintronics applications that is driven solely by waste heat, using magneto-Seebeck tunneling to convert spin information into a voltage that can be used for further data processing.