Main navigation | Main content

« fall 2017 - spring 2018 - *summer 2018* »

This week | Next week | This semester | All future | Print view

This week | Next week | This semester | All future | Print view

Friday, October 6th 2017

12:20 pm:

Spin relaxation in metals is often discussed within the framework of Elliott-Yafet (EY) relaxation, where the spin relaxation and elastic scattering rates are related via a proportionality constant referred to as the EY parameter. Although this parameter is known for some scattering sources (e.g., phonons) in certain elemental metals, experimental knowledge and general understanding remains limited. Here, we significantly expand the experimental knowledge base by determining EY phonon and defect parameters in Al and Cu non-local spin valves with channel thicknesses from 400 to 20 nm. For Al we find a surprisingly broad range for the phonon parameter which contrasts with expectations of a constant value for a specified material. In particular, we find an unexpected size dependence that is discussed in terms of finite size effects and the Debye temperature.These results identify factors limiting metallic spin diffusion lengths and hence the performance of nanoscopic spin transport devices.

The weekly calendar is also available via subscription to the physics-announce mailing list, and by RSS feed.