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arXiv 1410.0551cond-mat.mes-hall
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钇铁石榴石上铂和钽的自旋霍尔磁电阻和自旋塞贝克效应的同时探测

Simultaneous detection of the spin-Hall magnetoresistance and the spin-Seebeck effect in Platinum and Tantalum on Yttrium Iron Garnet

N. Vlietstra, M. Isasa, J. Shan, J. Ben Youssef, F. Casanova, B. J. van Wees

摘要:

通过外部加热样品(使用器件顶部的片上Pt加热器)以及电流感应加热来研究铂(Pt)和钽(Ta)在钇铁石榴石(YIG)上的自旋塞贝克效应(SSE)。对于SSE测量,外部加热是获得清晰信号的最常用方法。在这里,我们表明,也通过电流感应加热,它是可以直接观察到的SSE,分离也存在自旋霍尔磁阻(SMR)信号,通过使用锁定检测技术。使用这种测量技术,在低施加的磁场和高的加热电流的额外的第二阶信号的存在被揭示。这些信号是由所使用的AC电流产生的电流感应磁场(奥斯特场)引起的,从而产生动态SMR信号。

英文摘要:

The spin-Seebeck effect (SSE) in platinum (Pt) and tantalum (Ta) on yttrium iron garnet (YIG) has been investigated by both externally heating the sample (using an on-chip Pt heater on top of the device) as well as by current-induced heating. For SSE measurements, external heating is the most common method to obtain clear signals. Here we show that also by current-induced heating it is possible to directly observe the SSE, separate from the also present spin-Hall magnetoresistance (SMR) signal, by using a lock-in detection technique. Using this measurement technique, the presence of additional 2nd order signals at low applied magnetic fields and high heating currents is revealed. These signals are caused by current-induced magnetic fields (Oersted fields) generated by the used AC-current, resulting in dynamic SMR signals.

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