Enhancement in spin-torque efficiency by nonuniform spin current generated within a tapered nanopillar spin valve
Physical Review B - Condensed Matter and Materials Physics, cilt.77, sa.14, 2008 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 77 Sayı: 14
- Basım Tarihi: 2008
- Doi Numarası: 10.1103/physrevb.77.144423
- Dergi Adı: Physical Review B - Condensed Matter and Materials Physics
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu
- Boğaziçi Üniversitesi Adresli: Hayır
Özet
We examine the effect that a spatially nonuniform spin current with a component polarized partially out of the plane has on a low saturation magnetization nanomagnet free layer. Micromagnetic simulations indicate that the spin-torque efficiency acting upon the reversing nanomagnet can be enhanced through this process, resulting in faster switching with smaller currents. In doing so, we determine that micromagnetic structure within the nanomagnets can be beneficial for reversal processes. We experimentally verify this enhancement in devices with a tapered nanopillar geometry that generates a spin current polarized partially out of plane. © 2008 The American Physical Society.