Z. Qiu, K. Ando, K. Uchida, Y. Kajiwara, R. Takahashi, T. An, Y. Fujikawa, E. Saitoh
Spin pumping enables a generation of an electric signal in the form of a spin current even in an insulator at room temperature, which encourages efforts to develop a new class of insulator spintronics. The efficiency of the spin pumping is described in terms of spin mixing conductance at an interface. Improvement of spin mixing conductance is important for the development of spintronics devices. On the other hand, atomic structures at a metal/insulator interface have not been successfully observed or controlled thus far, and such situations can be the reason of scatter in the experimentally obtained values of spin mixing conductance. To overcome this problem, we prepared a bilayer spin pumping system composed of a well-controlled single-crystalline yttrium iron garnet (YIG) surface covered with a platinum (Pt) film, and we studied the spin mixing conductance at the Pt/YIG interface in this study. This interface has been studied extensively because of the extremely small magnetic damping of YIG and an effective spin current detector of Pt in the sense of the inverse spin Hall effect (ISHE). We demonstrate experimentally that crystal perfection at the interface contributes to a large spin mixing conductance. At a well-controlled Pt/YIG interface, we obtained the value of spin mixing conductance as 1.3 *10^18 m^-2, which is close to a theoretical prediction.
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http://arxiv.org/abs/1302.7091
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