Service de Physique de l'État Condensé (CNRS URA 2464), CEA Saclay, 91191 Gif-sur-Yvette, France.
Phys Rev Lett. 2013 Nov 22;111(21):217204. doi: 10.1103/PhysRevLett.111.217204. Epub 2013 Nov 21.
We report on the electrical detection of the dynamical part of the spin-pumping current emitted during ferromagnetic resonance using inverse spin Hall effect methods. The experiment is performed on a YIG|Pt bilayer. The choice of yttrium iron garnet (YIG), a magnetic insulator, ensures that no charge current flows between the two layers and only the pure spin current produced by the magnetization dynamics is transferred into the adjacent strong spin-orbit Pt layer via spin pumping. To avoid measuring the parasitic eddy currents induced at the frequency of the microwave source, a resonance at half the frequency is induced using parametric excitation in the parallel geometry. Triggering this nonlinear effect allows us to directly detect on a spectrum analyzer the microwave component of the inverse spin Hall effect voltage. Signals as large as 30 μV are measured for precession angles of a couple of degrees. This direct detection provides a novel efficient means to study magnetization dynamics on a very wide frequency range with great sensitivity.
我们报告了使用反自旋霍尔效应方法对铁磁共振过程中发射的动态部分自旋泵浦电流的电检测。实验是在 YIG|Pt 双层结构上进行的。选择钇铁石榴石（YIG），一种磁性绝缘体，可以确保两层之间没有电荷电流流动，只有由磁化动力学产生的纯自旋流通过自旋泵浦转移到相邻的强自旋轨道 Pt 层中。为了避免测量在微波源频率下感应的寄生涡流，通过在平行几何结构中的参数激励感应出半频共振。触发这个非线性效应可以使我们直接在频谱分析仪上测量反自旋霍尔效应电压的微波分量。对于几度的进动角度，测量到高达 30μV 的信号。这种直接检测提供了一种新颖且有效的方法，可在非常宽的频率范围内以高灵敏度研究磁化动力学。
