Spin-Transfer Torque Switching in Nanopillar Superconducting-Magnetic Hybrid Josephson Junctions
| Autor: | Paul D. Dresselhaus, Samuel P. Benz, Burm Baek, Matthew R. Pufall, William H. Rippard, Horst Rogalla, Stephen E. Russek |
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| Rok vydání: | 2015 |
| Předmět: |
Superconductivity
Josephson effect Materials science business.industry Condensed Matter - Superconductivity Spin-transfer torque FOS: Physical sciences General Physics and Astronomy Josephson coupling Superconductivity (cond-mat.supr-con) Pi Josephson junction CMOS Condensed Matter::Superconductivity Optoelectronics Torque business Nanopillar |
| Zdroj: | Physical Review Applied. 3 |
| ISSN: | 2331-7019 |
| Popis: | The combination of superconducting and magnetic materials to create novel superconducting devices has been motivated by the discovery of Josephson critical current (Ics) oscillations as a function of magnetic layer thickness and the demonstration of devices with switchable critical currents. However, none of the hybrid devices have shown any spintronic effects, such as spin-transfer torque, which are currently used in room-temperature magnetic devices, including spin-transfer torque random-access memory and spin-torque nano-oscillators. We have developed nanopillar Josephson junctions with a minimum feature size of 50 nm and magnetic barriers exhibiting magnetic pseudo-spin-valve behavior at 4 K. These devices allow current-induced magnetization switching that results in 20-fold changes in Ics. The current-induced magnetic switching is consistent with spin-transfer torque models for room-temperature magnetic devices. Our work demonstrates that devices that combine superconducting and spintronic functions show promise for the development of a nanoscale, nonvolatile, cryogenic memory technology. |
| Databáze: | OpenAIRE |
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