Spin Hall Angle and Spin Diffusion Length of Pd
G. Y. Luo (駱冠宇)1,2*, C. R. Chang1, J. G. Lin2
1Department of Physics, National Taiwan University, Taipei, Taiwan
2Center for Condensed Matter Sciences, National Taiwan University, Taipei, Taiwan
* presenting author:Guanyu Luo, email:mager.guanyu@gmail.com
Ferromagnetic resonance (FMR)-induced spin pumping provides a novel method to transfer the spin angular momentum from the ferromagnetic (FM) layer to the normal metal (NM) layer in a bilayered thin-film system. When pure spin current is pumped into the NM layer, the spin-orbit interaction causes the spin current to convert into charge current, and the process is named inverse spin Hall effect (ISHE). By ISHE voltage detection and FMR analysis on the bilayers, the spin Hall angle θ (defined as the ratio of spin Hall conductivity and charge conductivity) as well as the spin diffusion length of the NM can be obtained by fitting with ISHE equation.
In this work, we apply the aforementioned technique on a series of LSMO(20nm)/Pd(tPd = 4, 7, 10, 12, 15, 18 and 21 nm) bilayers made by pulsed laser deposition/sputtering. The resulting value of θISHE for Pd is 0.004 (0.4%), and the spin diffusion length is 7.6 nm.


Keywords: spintronics