Longitudinal spin Seebeck effect contribution in transverse spin Seebeck effect experiments in Pt/YIG and Pt/NFO.
Longitudinal spin Seebeck effect contribution in transverse spin Seebeck effect experiments in Pt/YIG and Pt/NFO.
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DOI：
10.1038/ncomms9211
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发表时间：
2015-09-23
影响因子：
16.6
通讯作者：
Reiss G
中科院分区：
文献类型：
--
作者：
Meier D;Reinhardt D;van Straaten M;Klewe C;Althammer M;Schreier M;Goennenwein STB;Gupta A;Schmid M;Back CH;Schmalhorst JM;Kuschel T;Reiss G
自旋Seebeck效应，由温度梯度产生的自旋电流，已经引起了极大的关注，但在一个毫米范围内的相互作用，沿着一个薄的铁磁膜以及意外的副作用，阻碍了明确的检测引起了有争议的讨论。在这里，我们调查的反自旋霍尔电压的10 nm薄的Pt带沉积在磁性绝缘体Y3Fe5O12和NiFe2O4的膜平面中的温度梯度。我们展示了自旋塞贝克效应的典型特征，尽管我们没有观察到横向自旋塞贝克效应的最显着特征。相反，我们将所观察到的电压归因于由接触尖端引起的寄生面外温度梯度产生的纵向自旋塞贝克效应，该温度梯度取决于尖端的材料、直径和温度。 自旋塞贝克效应的测量，由于温度梯度在铁磁体中产生自旋电流，经常受到寄生效应的阻碍。在这里，作者使用铁磁绝缘体，以显示如何横向自旋塞贝克测量可以解释的纵向自旋塞贝克。
The spin Seebeck effect, the generation of a spin current by a temperature gradient, has attracted great attention, but the interplay over a millimetre range along a thin ferromagnetic film as well as unintended side effects which hinder an unambiguous detection have evoked controversial discussions. Here, we investigate the inverse spin Hall voltage of a 10 nm thin Pt strip deposited on the magnetic insulators Y3Fe5O12 and NiFe2O4 with a temperature gradient in the film plane. We show characteristics typical of the spin Seebeck effect, although we do not observe the most striking features of the transverse spin Seebeck effect. Instead, we attribute the observed voltages to the longitudinal spin Seebeck effect generated by a contact tip induced parasitic out-of-plane temperature gradient, which depends on material, diameter and temperature of the tip. Measurements of the spin Seebeck effect, the generation of spin current in a ferromagnet due to a temperature gradient, are often hindered by parasitic effects. Here, the authors use ferromagnetic insulators to show how transverse spin Seebeck measurements can be explained by the longitudinal spin Seebeck.