Abstract:

The spin-orbit coupling is at the heart of efforts for spintronics, which aims to use spin for information storage and logic applications. There are two extreme cases for it, namely large spin orbit coupling and low spin orbit coupling. For materials with large spin orbit coupling such as platinum (Pt) and iridium ? manganese (Ir-Mn), a pure spin current could be generated via the spin Hall effect and lead to spin orbit torques that can largely manipulate the magnetization of FM films. In this talk, I will mainly discuss the role of the interface transparency for efficient spin orbit torque at Pt-FM interfaces and the observation of the facet dependent large spin Hall effect in Ir-Mn.
For materials with low spin orbit coupling such as graphene, they could be used as a spin channel with long spin lifetime and spin diffusion length. In this talk, I will describe experimental observation of long spin lifetime and spin diffusion length in graphene, which are already much better than conventional metals and semiconductors at room temperature.
 
 
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