Reducing the critical current for short-pulse spin-transfer switching of nanomagnets
Applied Physics Letters, cilt.87, sa.11, 2005 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 87 Sayı: 11
- Basım Tarihi: 2005
- Doi Numarası: 10.1063/1.2045552
- Dergi Adı: Applied Physics Letters
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Boğaziçi Üniversitesi Adresli: Hayır
Özet
We have fabricated permalloycopperpermalloy nanopillar spin valves designed to reduce the critical current for spin-transfer switching while maintaining thermal stability of the free layer. Pulsed current amplitudes necessary for switching a 4.5-nm -thick permalloy free layer range from 0.4 mA for a 100 ns pulse to 2 mA for a 1 ns pulse, showing that the magnetization must be overdriven to achieve switching on short time scales. Comparisons to Landau-Lifshitz-Gilbert simulations indicate an effective damping parameter ≈0.03 and spin-torque efficiencies for parallel-to-antiparallel and antiparallel-to-parallel switching that are more symmetric than predicted by recent theoretical models. © 2005 American Institute of Physics.