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Sayed S, Diep VQ, Camsari KY, et al. Spin Funneling for Enhanced Spin Injection into Ferromagnets. Sci Rep. 2016;6:28868doi: 10.1038/srep28868.
Sayed, S., Diep, V. Q., Camsari, K. Y., & Datta, S. (2016). Spin Funneling for Enhanced Spin Injection into Ferromagnets. Scientific reports, 628868. https://doi.org/10.1038/srep28868
Sayed, Shehrin, et al. "Spin Funneling for Enhanced Spin Injection into Ferromagnets." Scientific reports vol. 6 (2016): 28868. doi: https://doi.org/10.1038/srep28868
Sayed S, Diep VQ, Camsari KY, Datta S. Spin Funneling for Enhanced Spin Injection into Ferromagnets. Sci Rep. 2016 Jul 04;6:28868. doi: 10.1038/srep28868. PMID: 27374496; PMCID: PMC4931498.
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Sci Rep. 2016 Jul 04;6:28868. doi: 10.1038/srep28868.

Spin Funneling for Enhanced Spin Injection into Ferromagnets.

Scientific reports

Shehrin Sayed, Vinh Q Diep, Kerem Yunus Camsari, Supriyo Datta

Affiliations

  1. School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907, USA.

PMID: 27374496 PMCID: PMC4931498 DOI: 10.1038/srep28868

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 shunting by the low resistive NM layer utilizing the newly discovered phenomenon of pure spin conduction in ferromagnetic insulators via magnon diffusion. We provide a spin circuit model for magnon diffusion in FMI that is benchmarked against recent experiments and theory.

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