Pure detection of the acoustic spin pumping in Pt/YIG/PZT structures

Pt/YIG/PZT構造での音響スピンポンプの検出

内田 健一*; Qiu, Z.*; 吉川 貴史*; 齊藤 英治

Uchida, Kenichi*; Qiu, Z.*; Kikkawa, Takashi*; Saito, Eiji

The acoustic spin pumping (ASP) stands for the generation of a spin voltage from sound waves in a ferromagnet/paramagnet junction. In this letter, we propose and demonstrate a method for puredetection of the ASP, which enables the separation of sound-wave-driven spin currents from the spin Seebeck effect due to the heating of a sample caused by a sound-wave injection. Our demonstration using a Pt/YIG/PZT sample shows that the ASP signal in this structure measured by a conventional method is considerably offset by the heating signal and that the pure ASP signal is one order of magnitude greater than that reported in the previous study.