Spin Funneling for Enhanced Spin Injection into Ferromagnets.

ABSTRACT: It is well-established that high spin-orbit coupling (SOC) materials convert a charge current density into a spin current density which can be used to switch a magnet efficiently and there is increasing interest in identifying materials with large spin Hall angle for lower switching current. Using experimentally benchmarked models, we show that composite structures can be designed using existing spin Hall materials such that the effective spin Hall angle is larger by an order of magnitude. The basic idea is to funnel spins from a large area of spin Hall material into a small area of ferromagnet using a normal metal with large spin diffusion length and low resistivity like Cu or Al. We show that this approach is increasingly effective as magnets get smaller. We avoid unwanted charge current

SUBMITTER: Sayed S 

PROVIDER: S-EPMC4931498 | biostudies-literature | 2016 Jul

REPOSITORIES: biostudies-literature